TI PT4821C

PT4820 Series
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
Features
• Triple Outputs
(Independently Regulated)
• Input Voltage Range:
36V to 75V, 80V Surge
• 1500VDC Isolation
• Dual Logic On/Off Control
• Short-Circuit Protection
(All Outputs)
• Fixed Frequency Operation
• Over-Temperature Shutdown
• Under-Voltage Lockout
• Space Saving Package:
1.3 sq. in. PCB Area (suffix N)
• Solderable Copper Case
• Safety Approvals:
UL60950
CSA 22.2 950
VDE EN60950
Ordering Information
Description
The PT4820 Excalibur™ power
modules are a series of isolated tripleoutput DC/DC converters that
operate from a standard (–48V)
central office supply. Rated for up to
35W, these regulators are ideal for
powering many mixed logic applications. The triple-output voltage
combination allows for a compact
multiple-output power supply in a
single low-profile DC/DC module.
The available output voltage
options include a low-voltage power
bus for a DSP or ASIC core, and
two additional standard logic supply
voltages.
The PT4820 series incorporates
many features to simplify system
integration. These include a flexible
On/Off enable control, an input
under-voltage lock-out, and overtemperature protection. All outputs
have short-circuit protection and are
internally sequenced to meet the
power-up and power-down requirements of popular DSP ICs.
The PT4820 series is housed in
a space-saving solderable case. The
module requires no external heat sink
and can occupy as little as 1.3 in2 of
PCB area.
PT4821o
PT4822o
PT4823o
PT4824o
PT4825o
PT4826o
PT4827o
PT4828o
PT4829o
PT4831o
PT4832o
* PT4833o
=
=
=
=
=
=
=
=
=
=
=
=
+3.3/+2.5/+1.5V
+3.3/+1.8/+1.5V
+3.3/+2.5/+1.2V
+3.3/+1.8/+1.2V
+3.3/+1.5/+1.2V
+5.0/+3.3/+1.8V
+3.3/+2.5/+1.8V
+5.0/+2.5/+1.5V
+5.0/+1.8/+1.5V
+5.0/+3.3/+1.5V
+5.0/+3.3/+2.5V
+3.3/+2.0/+1.5V
* The PT4833 is not included in the VDE
safety certification.
PT Series Suffix (PT1234 x )
Case/Pin
Configuration
Vertical
Horizontal
SMD
Order
Suffix
Package
Code
N
A
C
(ENM)
(ENN)
(ENP)
(Reference the applicable package code drawing for
the dimensions and PC layout)
Typical Application
PT4820
+Vo 1
+VIN
3
+V IN
V1 Adj
I/O
12,13
11
+
Co 1
COM 9,10
+Vo 2
+
CIN
1
V2 Adj
Logic
16,17
15
+
DSL, DSP,
or ASIC
Chipset
Co 2
EN 1
COM 14
2
–VIN
Cin
Co1 , Co2, Co 3
EN1 & EN2 pins:
= Optional
= Optional; See specifications
EN 2
+Vo 3
4
–V IN
V3 Adj
Core
20,21
19
+
Co 3
COM 18
See On/Off Enable Logic
For technical support and more information, see inside back cover or visit www.ti.com
1
PT4820 Series
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
Environmental Specifications
Characteristics
Symbols
Ambient Temperature Range
Case Temperature
ShutdownTemperature
Solder Reflow Temperature
Storage Temperature
Mechanical Shock
Ta
Tc
OTP
Treflow
Ts
Conditions
Mechanical Vibration
Weight
Flammability
—
—
Min
Typ
Max
Units
Over Vin Range
Measured at center of case
–40
—
Surface temperature of module pins or case
—
Per Mil-STD-883D, Method 2002.3
1 msec, ½ Sine, mounted
Mil-STD-883D, Method 2007.2
Suffix A, C
20-2000 Hz
Vertical/Horizontal
Meets UL 94V-O
—
–40
—
—
115
—
—
+85 (i)
+100
125
215 (ii)
+125
°C
°C
°C
°C
°C
—
—
500
20 (iii)
—
—
G’s
—
50
—
grams
G’s
Notes: (i) See SOA curves or consult factory for appropriate derating.
(ii) During solder reflow of SMD package version, do not elevate the module case, pins, or internal component temperatures above a peak of 215°C. For
further guidance refer to the application note, “Reflow Soldering Requirements for Plug-in Power Surface Mount Products,” (SLTA051).
(iii) The case pins on through-hole pin configurations (N & A) must be soldered. For more information see the applicable package outline drawing.
Pin Configuration
On/Off Enable Logic
Pin Function
Pin Function
Pin 1
1
EN 1
12
Vo1
2
EN 2
13
Vo1
3
+Vin
14
COM
4
–Vin
15
Vo2 adjust
5
Do Not Connect
16
+Vo2
6
Pin Not Present
17
+Vo2
7
Pin Not Present
18
COM
8
Pin Not Present
19
Vo3 adjust
9
COM
20
+Vo3
10
COM
21
+Vo3
11
Vo1 Adjust
Pin 2
Output Status
×
1
Off
1
0
On
0
×
Off
Notes:
Logic 1 =Open collector
Logic 0 = –Vin (pin 2) potential
For positive Enable function, connect pin 2
to pin 4 and use pin 1.
For negative Enable function, leave pin 1
open and use pin 2.
For automatice power-up connect pin 2 to
pin 4 and leave pin 1 open.
Note: Shaded functions indicates those pins that are at primary-side
potential. All other pins are referenced to the secondary.
Pin Descriptions
+Vin: The positive input supply for the module with
respect to –Vin. When powering the module from a
–48V telecom central office supply, this input is
connected to the primary system ground.
–Vin: The negative input supply for the module, and
the 0VDC reference for the EN 1, and EN 2 inputs.
When powering the module from a +48V supply,
this input is connected to the 48V(Return).
EN 1: The positive logic input that activates the
module output. If not used, this pin should be left
open circuit. Connecting this input to –Vin disables
the module’s outputs.
EN 2: The negative logic input that activates the
module output. This pin must be connected to –Vin
to enable the module’s outputs. A high impedance
disables the module’s outputs.
Vo 1: The highest regulated output voltage, which is
referenced to the COM node.
Vo 2: The regulated output that is designed to power
logic circuitry. It is referenced to the COM node.
Vo 3: The low-voltage regulated output that provides
power for a µ-processor or DSP core, and is referenced to the COM node.
COM: The secondary return reference for the module’s
three regulated output voltages. It is DC isolated from
the input supply pins.
Vo1 Adjust: Using a single resistor, this pin allows Vo1
to be adjusted higher or lower than the preset value.
If not used, this pin should be left open circuit.
Vo2 Adjust: Using a single resistor, this pin allows Vo2
to be adjusted higher or lower than the preset value.
If not used, this pin should be left open circuit.
Vo3 Adjust: Using a single resistor, this pin allows Vo3
to be adjusted higher or lower than the preset value.
If not used, this pin should be left open circuit.
For technical support and more information, see inside back cover or visit www.ti.com
2
PT4821—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
PT4821 Electrical Specifications
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
(Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5I omax)
PT4821
Typ
Max
—
—
—
—
—
—
3.3
2.5
1.5
±0.5
±0.5
±0.1
±0.1
—
—
87
40
35
25
200
3
±10
14
400
8 (2)
6 (2)
6 (2)
12 (2)
75
80
3.36
2.55
1.53
—
—
±0.5
±0.5
±3 (3)
±3 (3)
—
—
—
—
—
—
—
—
450
—
—
35.5
34
—
—
V
—
140 (4)
—
ms
4
–0.2
—
—
15
0.8
Characteristics
Symbols
Conditions
Output Current
Io
Each output
Input Voltage Range
Vin
Total (Io1 + Io2 + Io3)
Continuous
Surge (1 minute)
Set-Point Voltage
Vo
Temperature Variation
Regtemp
–40°C ≤Ta ≤+85°C, Io =Iomin
Line Regulation
Load Regulation
Total Output Voltage Variation
Regline
Regload
∆Vo tol
Efficiency
Vo Ripple/Noise
(0 to 20MHz bandwidth)
η
Vn
All outputs, Over Vin range
All outputs, 0≤Io≤Iomax
Includes set-point, line, load,
–40°C ≤Ta ≤+85°C
Io1 =6A, Io2 =2A, Io3 =2A
Transient Response
ttr
Vos
Voadj
ITRIP
ƒs
0.1A/µs load step, 50% to 75% Iomax
Vo over/undershoot
Vo1/Vo2/Vo3
Total, all outputs. Reset with auto-recovery
Over Vin and Io ranges
0.25
0.1
0.1
—
36
—
3.24
2.45
1.47
—
—
—
—
—
—
—
—
—
—
—
—
—
—
350
Under Voltage Lockout
Von
Voff
Vin increasing
Vin decreasing
Turn-On Time
ton
Vin =48V step
Output Adjust Range
Over-Current Threshold
Switching Frequency
Enable Control (pins 1 & 2)
High-Level Input Voltage
Low-Level Input Voltage
Low-Level Input Current
Standby Input Current
Min
Io1 (3.3V)
Io2 (2.5V)
Io3 (1.5V)
Vo1
Vo2
Vo3
Vo1
Vo2/Vo3
Vo1
Vo2/Vo3
Vo1
Vo2
Vo3
(1)
(1)
(1)
A
A
V
V
%Vo
%Vo
%Vo
%Vo
%
mVpp
µSec
%Vo
%Vo
A
kHz
Referenced to –Vin (pin 4)
VIH
VIL
IIL
Iin standby
pins 1 & 2 open circuit
(5)
V
—
1
2
mA
—
1
5
mA
Internal Input Capacitance
Cint
—
1.14
—
External Output Capacitance
Co1
Co2
Co3
V iso
C iso
R iso
0
0
0
1500
—
10
220
220
220
—
2,200
—
1,000
1,000
1,000
—
—
—
Primary/Secondary Isolation
Units
µF
(6)
(6)
µF
(6)
V
pF
MΩ
Notes: (1)
(2)
(3)
(4)
(5)
The converter will operate down to no load with reduced specifications.
The sum-total current from outputs Vo1, Vo2, and Vo3 not to exceed 12ADC.
Limits are specified by design.
Measured from the application of the input voltage to the instance that all outputs are in regulation.
The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –V in allows the the converter to operate when
input power is applied. The maximum open-circuit voltage is 4V.
(6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using.
For technical support and more information, see inside back cover or visit www.ti.com
3
Typical Characteristics
PT4821—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4821 Performance Characteristics
PT4821 Thermal Performance
(See Notes A, B)
(See Note C)
(Io1 + Io2 + Io3 =12A, represents 100% Load)
100
Efficiency vs Output Power
(Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load)
Power Dissipation vs Output Load
8
90
80
VIN
Pd - Watts
Efficiency - %
6
VIN
36V
48V
75V
70
75V
48V
36V
4
2
60
50
0
0
20
40
60
80
100
0
20
Output Load (%)
100
40
60
80
100
Output Load (%)
Efficiency vs Output Power
(Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load)
Safe Operating Area @Vin =48V
90
Ambient Temperature (°C)
80
Efficiency - %
90
VIN
80
36V
48V
75V
70
60
200LFM
60
120LFM
60LFM
Nat conv
50
40
30
20
50
0
20
40
60
80
0%
100
20%
40%
60%
80%
100%
Output Load (%)
Output Load (%)
100
Airflow
70
Output Ripple vs Output Power; Vin =48V
(Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load)
80
Ripple - mV
VOUT
60
3.3V
2.5V
1.5V
40
20
0
0
20
40
60
80
100
Output Load (%)
100
Output Ripple vs Output Power; Vin =48V
(Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load)
80
Ripple - mV
VOUT
60
3.3V
2.5V
1.5V
40
20
0
0
20
40
60
80
100
Output Load (%)
Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.
Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition.
Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures.
For technical support and more information, see inside back cover or visit www.ti.com
4
PT4822—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
PT4822 Electrical Specifications
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
(Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5I omax)
Characteristics
Symbols
Conditions
Output Current
Io
Each output
Input Voltage Range
Vin
Total (Io1 + Io2 + Io3)
Continuous
Surge (1 minute)
Set-Point Voltage
Vo
PT4822
Typ
Max
—
—
—
—
—
—
3.3
1.8
1.5
±0.5
±0.5
±0.1
±0.1
—
—
86
40
25
25
200
3
±10
14
400
8 (2)
6 (2)
6 (2)
12 (2)
75
80
3.36
1.84
1.53
—
—
±0.5
±0.5
±3 (3)
±3 (3)
—
—
—
—
—
—
—
—
450
Units
Temperature Variation
Regtemp
–40°C ≤Ta ≤+85°C, Io =Iomin
Line Regulation
Load Regulation
Total Output Voltage Variation
Regline
Regload
∆Vo tol
Efficiency
Vo Ripple/Noise
(0 to 20MHz bandwidth)
η
Vn
All outputs, Over Vin range
All outputs, 0≤Io≤Iomax
Includes set-point, line, load,
–40°C ≤Ta ≤+85°C
Io1 =6A, Io2 =2A, Io3 =2A
Transient Response
ttr
Vos
Voadj
ITRIP
ƒs
0.1A/µs load step, 50% to 75% Iomax
Vo over/undershoot
Vo1/Vo2/Vo3
Total, all outputs. Reset with auto-recovery
Over Vin and Io ranges
0.25 (1)
0.1 (1)
0.1 (1)
—
36
—
3.24
1.76
1.47
—
—
—
—
—
—
—
—
—
—
—
—
—
—
350
Under Voltage Lockout
Von
Voff
Vin increasing
Vin decreasing
—
—
35.5
34
—
—
V
Turn-On Time
ton
Vin =48V step
—
140 (4)
—
ms
4
–0.2
—
—
15
0.8
Output Adjust Range
Over-Current Threshold
Switching Frequency
Enable Control (pins 1 & 2)
High-Level Input Voltage
Low-Level Input Voltage
Low-Level Input Current
Standby Input Current
Io1 (3.3V)
Io2 (1.8V)
Io3 (1.5V)
Min
Vo1
Vo2
Vo3
Vo1
Vo2/Vo3
Vo1
Vo2/Vo3
Vo1
Vo2
Vo3
A
V
V
%Vo
%Vo
%Vo
%Vo
%
mVpp
µSec
%Vo
%Vo
A
kHz
Referenced to –Vin (pin 4)
VIH
VIL
IIL
Iin standby
pins 1 & 2 open circuit
(5)
V
—
1
2
mA
—
1
5
mA
Internal Input Capacitance
Cint
—
1.14
—
External Output Capacitance
Co1
Co2
Co3
V iso
C iso
R iso
0
0
0
1500
—
10
220
220
220
—
2,200
—
1,000
1,000
1,000
—
—
—
Primary/Secondary Isolation
A
µF
(6)
(6)
µF
(6)
V
pF
MΩ
Notes: (1)
(2)
(3)
(4)
(5)
The converter will operate down to no load with reduced specifications.
The sum-total current from outputs Vo1, Vo2, and Vo3 cannot exceed 12ADC.
Limits are specified by design.
Measured from the application of the input voltage to the instance that all outputs are in regulation.
The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –V in allows the the converter to operate when
input power is applied. The maximum open-circuit voltage is 4V.
(6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using.
For technical support and more information, see inside back cover or visit www.ti.com
5
Typical Characteristics
PT4822—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4822 Performance Characteristics
PT4822 Thermal Performance
(See Note A, B)
(See Note C)
(Io1 + Io2 + Io3 =12A, represents 100% Load)
100
Efficiency vs Output Power
(Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load)
Power Dissipation vs Output Load
8
90
80
VIN
Pd - Watts
Efficiency - %
6
VIN
36V
48V
75V
70
75V
48V
36V
4
2
60
0
50
0
20
40
60
80
0
100
20
Output Load (%)
100
40
60
80
100
Output Load (%)
Efficiency vs Output Power
(Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load)
Safe Operating Area @Vin =48V
90
80
Ambient Temperature (°C)
Efficiency - %
90
VIN
80
36V
48V
75V
70
60
Airflow
70
200LFM
120LFM
60LFM
Nat Conv
60
50
40
30
50
20
0
20
40
60
80
100
0%
Output Load (%)
100
20%
40%
60%
80%
100%
Output Load (%)
Output Ripple vs Output Power; Vin =48V
(Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load)
80
Ripple - mV
VOUT
60
3.3V
1.8V
1.5V
40
20
0
0
20
40
60
80
100
Output Load (%)
100
Output Ripple vs Output Power; Vin =48V
(Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load)
80
Ripple - mV
VOUT
60
3.3V
1.8V
1.5V
40
20
0
0
20
40
60
80
100
Output Load (%)
Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.
Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition.
Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures.
For technical support and more information, see inside back cover or visit www.ti.com
6
PT4823—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
PT4823 Electrical Specifications
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
(Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5I omax)
Characteristics
Symbols
Conditions
Output Current
Io
Each output
Input Voltage Range
Vin
Total (Io1 + Io2 + Io3)
Continuous
Surge (1 minute)
Set-Point Voltage
Vo
Min
Max
—
—
—
—
—
—
3.3
2.5
1.2
±0.5
±0.5
±0.1
±0.1
—
—
85.6
35
25
25
200
3
±10
14
400
8 (2)
6 (2)
6 (2)
12 (2)
75
80
3.36
2.55
1.23
—
—
±0.5
±0.5
±3 (3)
±3 (3)
—
—
—
—
—
—
—
—
450
Units
Temperature Variation
Regtemp
–40°C ≤Ta ≤+85°C, Io =Iomin
Line Regulation
Load Regulation
Total Output Voltage Variation
Regline
Regload
∆Vo tol
Efficiency
Vo Ripple/Noise
(0 to 20MHz bandwidth)
η
Vn
All outputs, Over Vin range
All outputs, 0≤Io≤Iomax
Includes set-point, line, load,
–40°C ≤Ta ≤+85°C
Io1 =6A, Io2 =2A, Io3 =2A
Transient Response
ttr
Vos
Voadj
ITRIP
ƒs
0.1A/µs load step, 50% to 75% Iomax
Vo over/undershoot
Vo1/Vo2/Vo3
Total, all outputs. Reset with auto-recovery
Over Vin and Io ranges
0.25
0.1
0.1
—
36
—
3.24
2.45
1.17
—
—
—
—
—
—
—
—
—
—
—
—
—
—
350
Under Voltage Lockout
Von
Voff
Vin increasing
Vin decreasing
—
—
35.5
34
—
—
V
Turn-On Time
ton
Vin =48V step
—
140 (4)
—
ms
4
–0.2
—
—
15
0.8
Output Adjust Range
Over-Current Threshold
Switching Frequency
Enable Control (pins 1 & 2)
High-Level Input Voltage
Low-Level Input Voltage
Low-Level Input Current
Standby Input Current
Io1 (3.3V)
Io2 (2.5V)
Io3 (1.2V)
PT4823
Typ
Vo1
Vo2
Vo3
Vo1
Vo2/Vo3
Vo1
Vo2/Vo3
Vo1
Vo2
Vo3
(1)
(1)
(1)
A
V
V
%Vo
%Vo
%Vo
%Vo
%
mVpp
µSec
%Vo
%Vo
A
kHz
Referenced to –Vin (pin 4)
VIH
VIL
IIL
Iin standby
pins 1 & 2 open circuit
(5)
V
—
1
2
mA
—
1
5
mA
Internal Input Capacitance
Cint
—
1.14
—
External Output Capacitance
Co1
Co2
Co3
V iso
C iso
R iso
0
0
0
1500
—
10
220
220
220
—
2,200
—
1,000
1,000
1,000
—
—
—
Primary/Secondary Isolation
A
µF
(6)
(6)
µF
(6)
V
pF
MΩ
Notes: (1)
(2)
(3)
(4)
(5)
The converter will operate down to no load with reduced specifications.
The sum-total current from outputs Vo1, Vo2, and Vo3 cannot exceed 12ADC.
Limits are specified by design.
Measured from the application of the input voltage to the instance that all outputs are in regulation.
The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –V in allows the the converter to operate when
input power is applied. The maximum open-circuit voltage is 4V.
(6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using.
For technical support and more information, see inside back cover or visit www.ti.com
7
Typical Characteristics
PT4823—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4823 Performance Characteristics
(See Notes A, B)
PT4823 Thermal Performance
(See Note C)
(Io1 + Io2 + Io3 =12A, represents 100% Load)
100
Efficiency vs Output Power
(Io1 =8A, Io 2 =2A, Io3 =2A represents 100% Load)
Power Dissipation vs Output Load
8
90
80
VIN
Pd - Watts
Efficiency - %
6
VIN
36V
48V
75V
70
75V
48V
36V
4
2
60
50
0
0
20
40
60
80
100
0
20
Output Load (%)
100
40
60
80
100
Output Load (%)
Efficiency vs Output Power
(Io1 =4A, Io 2 =4A, Io3 =4A represents 100% Load)
Safe Operating Area @Vin =48V
90
80
Ambient Temperature (°C)
Efficiency - %
90
VIN
80
36V
48V
75V
70
60
Airflow
70
200LFM
120LFM
60LFM
Nat Conv
60
50
40
30
50
20
0
20
40
60
80
100
0%
Output Load (%)
100
20%
40%
60%
80%
100%
Output Load (%)
Output Ripple vs Output Power; Vin =48V
(Io1 =8A, Io 2 =2A, Io3 =2A represents 100% Load)
80
Ripple - mV
VOUT
60
2.5V
3.3V
1.2V
40
20
0
0
20
40
60
80
100
Output Load (%)
100
Output Ripple vs Output Power; Vin =48V
(Io1 =4A, Io 2 =4A, Io3 =4A represents 100% Load)
80
Ripple - mV
VOUT
60
2.5V
3.3V
1.2V
40
20
0
0
20
40
60
80
100
Output Load (%)
Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.
Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition.
Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures.
For technical support and more information, see inside back cover or visit www.ti.com
8
PT4824—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
PT4824 Electrical Specifications
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
(Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5I omax)
Characteristics
Symbols
Conditions
Output Current
Io
Each output
Input Voltage Range
Vin
Total (Io1 + Io2 + Io3)
Continuous
Surge (1 minute)
Set-Point Voltage
Vo
Min
Max
—
—
—
—
—
—
3.3
1.8
1.2
±0.5
±0.5
±0.1
±0.1
—
—
85
30
25
25
200
3
±10
14
400
8 (2)
6 (2)
6 (2)
12 (2)
75
80
3.36
1.84
1.23
—
—
±0.5
±0.5
±3 (3)
±3 (3)
—
—
—
—
—
—
—
—
450
Units
Temperature Variation
Regtemp
–40°C ≤Ta ≤+85°C, Io =Iomin
Line Regulation
Load Regulation
Total Output Voltage Variation
Regline
Regload
∆Vo tol
Efficiency
Vo Ripple/Noise
(0 to 20MHz bandwidth)
η
Vn
All outputs, Over Vin range
All outputs, 0≤Io≤Iomax
Includes set-point, line, load,
–40°C ≤Ta ≤+85°C
Io1 =6A, Io2 =2A, Io3 =2A
Transient Response
ttr
Vos
Voadj
ITRIP
ƒs
0.1A/µs load step, 50% to 75% Iomax
Vo over/undershoot
Vo1/Vo2/Vo3
Total, all outputs. Reset with auto-recovery
Over Vin and Io ranges
0.25
0.1
0.1
—
36
—
3.24
1.76
1.17
—
—
—
—
—
—
—
—
—
—
—
—
—
—
350
Under Voltage Lockout
Von
Voff
Vin increasing
Vin decreasing
—
—
35.5
34
—
—
V
Turn-On Time
ton
Vin =48V step
—
140 (4)
—
ms
4
–0.2
—
—
15
0.8
Output Adjust Range
Over-Current Threshold
Switching Frequency
Enable Control (pins 1 & 2)
High-Level Input Voltage
Low-Level Input Voltage
Low-Level Input Current
Standby Input Current
Io1 (3.3V)
Io2 (1.8V)
Io3 (1.2V)
PT4824
Typ
Vo1
Vo2
Vo3
Vo1
Vo2/Vo3
Vo1
Vo2/Vo3
Vo1
Vo2
Vo3
(1)
(1)
(1)
A
V
V
%Vo
%Vo
%Vo
%Vo
%
mVpp
µSec
%Vo
%Vo
A
kHz
Referenced to –Vin (pin 4)
VIH
VIL
IIL
Iin standby
pins 1 & 2 open circuit
(5)
V
—
1
2
mA
—
1
5
mA
Internal Input Capacitance
Cint
—
1.14
—
External Output Capacitance
Co1
Co2
Co3
V iso
C iso
R iso
0
0
0
1500
—
10
220
220
220
—
2,200
—
1,000
1,000
1,000
—
—
—
Primary/Secondary Isolation
A
µF
(6)
(6)
µF
(6)
V
pF
MΩ
Notes: (1)
(2)
(3)
(4)
(5)
The converter will operate down to no load with reduced specifications.
The sum-total current from outputs Vo1, Vo2, and Vo3 cannot exceed 12ADC.
Limits are specified by design.
Measured from the application of the input voltage to the instance that all outputs are in regulation.
The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –V in allows the the converter to operate when
input power is applied. The maximum open-circuit voltage is 4V.
(6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using.
For technical support and more information, see inside back cover or visit www.ti.com
9
Typical Characteristics
PT4824—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4824 Performance Characteristics
PT4824 Thermal Performance
(See Notes A, B)
(See Note C)
(Io1 + Io2 + Io3 =12A, represents 100% Load)
100
Efficiency vs Output Power
(Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load)
Power Dissipation vs Output Load
8
90
6
80
VIN
Pd - Watts
Efficiency - %
VIN
36V
48V
75V
70
36V
48V
75V
4
2
60
50
0
0
20
40
60
80
100
0
20
Output Load (%)
100
40
60
80
100
Output Load (%)
Efficiency vs Output Power
(Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load)
Safe Operating Area @Vin =48V
90
80
Ambient Temperature (°C)
90
Efficiency - %
VIN
80
36V
48V
75V
70
60
Airflow
70
200LFM
120LFM
60LFM
Nat Conv
60
50
40
30
50
20
0
20
40
60
80
100
0%
Output Load (%)
100
20%
40%
60%
80%
100%
Output Load (%)
Output Ripple vs Output Power; Vin =48V
(Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load)
80
Ripple - mV
VOUT
60
3.3V
1.8V
1.2V
40
20
0
0
20
40
60
80
100
Output Load (%)
100
Output Ripple vs Output Power; Vin =48V
(Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load)
80
Ripple - mV
VOUT
60
3.3V
1.8V
1.2V
40
20
0
0
20
40
60
80
100
Output Load (%)
Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.
Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition.
Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures.
For technical support and more information, see inside back cover or visit www.ti.com
10
PT4825—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
PT4825 Electrical Specifications
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
(Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5I omax)
Characteristics
Symbols
Conditions
Output Current
Io
Each output
Input Voltage Range
Vin
Total (Io1 + Io2 + Io3)
Continuous
Surge (1 minute)
Set-Point Voltage
Vo
Min
Max
—
—
—
—
—
—
3.3
1.5
1.2
±0.5
±0.5
±0.1
±0.1
—
—
86
35
25
25
200
3
±10
14
400
8 (2)
6 (2)
6 (2)
12 (2)
75
80
3.36
1.53
1.23
—
—
±0.5
±0.5
±3 (3)
±3 (3)
—
—
—
—
—
—
—
—
450
Units
Temperature Variation
Regtemp
–40°C ≤Ta ≤+85°C, Io =Iomin
Line Regulation
Load Regulation
Total Output Voltage Variation
Regline
Regload
∆Vo tol
Efficiency
Vo Ripple/Noise
(0 to 20MHz bandwidth)
η
Vn
All outputs, Over Vin range
All outputs, 0≤Io≤Iomax
Includes set-point, line, load,
–40°C ≤Ta ≤+85°C
Io1 =6A, Io2 =2A, Io3 =2A
Transient Response
ttr
Vos
Voadj
ITRIP
ƒs
0.1A/µs load step, 50% to 75% Iomax
Vo over/undershoot
Vo1/Vo2/Vo3
Total, all outputs. Reset with auto-recovery
Over Vin and Io ranges
0.25
0.1
0.1
—
36
—
3.24
1.47
1.17
—
—
—
—
—
—
—
—
—
—
—
—
—
—
350
Under Voltage Lockout
Von
Voff
Vin increasing
Vin decreasing
—
—
35.5
34
—
—
V
Turn-On Time
ton
Vin =48V step
—
140 (4)
—
ms
4
–0.2
—
—
15
0.8
Output Adjust Range
Over-Current Threshold
Switching Frequency
Enable Control (pins 1 & 2)
High-Level Input Voltage
Low-Level Input Voltage
Low-Level Input Current
Standby Input Current
Io1 (3.3V)
Io2 (1.5V)
Io3 (1.2V)
PT4825
Typ
Vo1
Vo2
Vo3
Vo1
Vo2/Vo3
Vo1
Vo2/Vo3
Vo1
Vo2
Vo3
(1)
(1)
(1)
A
V
V
%Vo
%Vo
%Vo
%Vo
%
mVpp
µSec
%Vo
%Vo
A
kHz
Referenced to –Vin (pin 4)
VIH
VIL
IIL
Iin standby
pins 1 & 2 open circuit
(5)
V
—
1
2
mA
—
1
5
mA
Internal Input Capacitance
Cint
—
1.14
—
External Output Capacitance
Co1
Co2
Co3
V iso
C iso
R iso
0
0
0
1500
—
10
220
220
220
—
2,200
—
1,000
1,000
1,000
—
—
—
Primary/Secondary Isolation
A
µF
(6)
(6)
µF
(6)
V
pF
MΩ
Notes: (1)
(2)
(3)
(4)
(5)
The converter will operate down to no load with reduced specifications.
The sum-total current from outputs Vo1, Vo2, and Vo3 not to exceed 12ADC.
Limits are specified by design.
Measured from the application of the input voltage to the instance that all outputs are in regulation.
The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –V in allows the the converter to operate when
input power is applied. The maximum open-circuit voltage is 4V.
(6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using.
For technical support and more information, see inside back cover or visit www.ti.com
11
Typical Characteristics
PT4825—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4825 Performance Characteristics
(See Notes A, B)
PT4825 Thermal Performance
(See Note C)
(Io1 + Io2 + Io3 =12A, represents 100% Load)
100
Efficiency vs Output Power
(Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load)
Power Dissipation vs Output Load
10
8
VIN
80
VIN
Pd - Watts
Efficiency - %
90
36V
48V
75V
70
60
6
36V
48V
75V
4
2
50
0
0
20
40
60
80
100
0
20
Output Load (%)
100
40
60
80
100
Output Load (%)
Efficiency vs Output Power
(Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load)
Safe Operating Area @Vin =48V
90
80
Ambient Temperature (°C)
Efficiency - %
90
VIN
80
36V
48V
75V
70
60
Airflow
70
200LFM
120LFM
60LFM
Nat Conv
60
50
40
30
50
20
0
20
40
60
80
100
0%
Output Load (%)
100
20%
40%
60%
80%
100%
Output Load (%)
Output Ripple vs Output Power; Vin =48V
(Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load)
80
Ripple - mV
VOUT
60
3.3V
1.2V
1.5V
40
20
0
0
20
40
60
80
100
Output Load (%)
100
Output Ripple vs Output Power; Vin =48V
(Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load)
80
Ripple - mV
VOUT
60
3.3V
1.2V
1.5V
40
20
0
0
20
40
60
80
100
Output Load (%)
Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.
Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition.
Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures.
For technical support and more information, see inside back cover or visit www.ti.com
12
PT4826—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
PT4826 Electrical Specifications
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
(Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5I omax)
PT4826
Typ
Max
—
—
—
—
—
—
5.0
3.3
1.8
±0.5
±0.5
±0.1
±0.1
—
—
87
40
35
25
200
5
±10
11
400
5.0 (2)
5.5 (2)
5.5 (2)
9 (2)
75
80
5.1
3.36
1.84
—
—
±0.5
±0.5
±3 (3)
±3 (3)
—
—
—
—
—
—
—
—
450
—
—
35.5
34
—
—
V
—
140 (4)
—
ms
4
–0.2
—
—
15
0.8
Characteristics
Symbols
Conditions
Output Current
Io
Each output
Input Voltage Range
Vin
Total (Io1 + Io2 + Io3)
Continuous
Surge (1 minute)
Set-Point Voltage
Vo
Temperature Variation
Regtemp
–40°C ≤Ta ≤+85°C, Io =Iomin
Line Regulation
Load Regulation
Total Output Voltage Variation
Regline
Regload
∆Vo tol
Efficiency
Vo Ripple/Noise
(0 to 20MHz bandwidth)
η
Vn
All outputs, Over Vin range
All outputs, 0≤Io≤Iomax
Includes set-point, line, load,
–40°C ≤Ta ≤+85°C
Io1 =5A, Io2 =2A, Io3 =2A
Transient Response
ttr
Vos
Voadj
ITRIP
ƒs
0.1A/µs load step, 50% to 75% Iomax
Vo over/undershoot
Vo1/Vo2/Vo3
Total, all outputs. Reset with auto-recovery
Over Vin and Io ranges
0.25
0.1
0.1
—
36
—
4.9
3.24
1.76
—
—
—
—
—
—
—
—
—
—
—
—
—
—
350
Under Voltage Lockout
Von
Voff
Vin increasing
Vin decreasing
Turn-On Time
ton
Vin =48V step
Output Adjust Range
Over-Current Threshold
Switching Frequency
Enable Control (pins 1 & 2)
High-Level Input Voltage
Low-Level Input Voltage
Low-Level Input Current
Standby Input Current
Min
Io1 (5.0V)
Io2 (3.3V)
Io3 (1.8V)
Vo1
Vo2
Vo3
Vo1
Vo2/Vo3
Vo1
Vo2/Vo3
Vo1
Vo2
Vo3
(1)
(1)
(1)
A
A
V
V
%Vo
%Vo
%Vo
%Vo
%
mVpp
µSec
%Vo
%Vo
A
kHz
Referenced to –Vin (pin 4)
VIH
VIL
IIL
Iin standby
pins 1 & 2 open circuit
(5)
V
—
1
2
mA
—
1
5
mA
Internal Input Capacitance
Cint
—
1.14
—
External Output Capacitance
Co1
Co2
Co3
V iso
C iso
R iso
0
0
0
1500
—
10
220
220
220
—
2,200
—
1,000
1,000
1,000
—
—
—
Primary/Secondary Isolation
Units
µF
(6)
(6)
µF
(6)
V
pF
MΩ
Notes: (1)
(2)
(3)
(4)
(5)
The converter will operate down to no load with reduced specifications.
The sum-total current from outputs Vo1, Vo2, and Vo3 cannot exceed 9ADC.
Limits are specified by design.
Measured from the application of the input voltage to the instance that all outputs are in regulation.
The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –V in allows the the converter to operate when
input power is applied. The maximum open-circuit voltage is 4V.
(6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using.
For technical support and more information, see inside back cover or visit www.ti.com
13
Typical Characteristics
PT4826—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4826 Performance Characteristics
(See Notes A, B)
PT4826 Thermal Performance
(See Note C)
(Io1 + Io2 + Io3 =9A, represents 100% Load)
100
Efficiency vs Output Power
(Io1 =5A, Io2 =2A, Io3 =2A represents 100% Load)
Power Dissipation vs Output Load
10
90
8
80
VIN
Pd - Watts
Efficiency - %
VIN
36V
48V
75V
70
60
6
75V
48V
36V
4
2
50
0
0
20
40
60
80
100
0
20
Output Load (%)
100
40
60
80
100
Output Load (%)
Efficiency vs Output Power
(Io1 =2A, Io2 =2A, Io3 =5A represents 100% Load)
Safe Operating Area @Vin =48V
90
80
Ambient Temperature (°C)
90
Efficiency - %
VIN
80
36V
48V
75V
70
60
Airflow
70
200LFM
120LFM
60LFM
Nat Conv
60
50
40
30
50
20
0
20
40
60
80
100
0%
Output Load (%)
100
20%
40%
60%
80%
100%
Output Load (%)
Output Ripple vs Output Power; Vin =48V
(Io1 =5A, Io2 =2A, Io3 =2A represents 100% Load)
80
Ripple - mV
VOUT
60
3.3V
1.8V
5V
40
20
0
0
20
40
60
80
100
Output Load (%)
100
Output Ripple vs Output Power; Vin =48V
(Io1 =2A, Io2 =2A, Io3 =5A represents 100% Load)
80
Ripple - mV
VOUT
60
3.3V
1.8V
5.0V
40
20
0
0
20
40
60
80
100
Output Load (%)
Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.
Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition.
Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures.
For technical support and more information, see inside back cover or visit www.ti.com
14
PT4827—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
PT4827 Electrical Specifications
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
(Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5I omax)
Characteristics
Symbols
Conditions
Output Current
Io
Each output
Input Voltage Range
Vin
Total (Io1 + Io2 + Io3)
Continuous
Surge (1 minute)
Set-Point Voltage
Vo
Min
Max
—
—
—
—
—
—
3.3
2.5
1.8
±0.5
±0.5
±0.1
±0.1
—
—
86
40
35
25
200
3
±10
14
400
8 (2)
6 (2)
6 (2)
12 (2)
75
80
3.36
2.55
1.84
—
—
±0.5
±0.5
±3 (3)
±3 (3)
—
—
—
—
—
—
—
—
450
Units
Temperature Variation
Regtemp
–40°C ≤Ta ≤+85°C, Io =Iomin
Line Regulation
Load Regulation
Total Output Voltage Variation
Regline
Regload
∆Vo tol
Efficiency
Vo Ripple/Noise
(0 to 20MHz bandwidth)
η
Vn
All outputs, Over Vin range
All outputs, 0≤Io≤Iomax
Includes set-point, line, load,
–40°C ≤Ta ≤+85°C
Io1 =6A, Io2 =2A, Io3 =2A
Transient Response
ttr
Vos
Voadj
ITRIP
ƒs
0.1A/µs load step, 50% to 75% Iomax
Vo over/undershoot
Vo1/Vo2/Vo3
Total, all outputs. Reset with auto-recovery
Over Vin and Io ranges
0.25
0.1
0.1
—
36
—
3.24
2.45
1.76
—
—
—
—
—
—
—
—
—
—
—
—
—
—
350
Under Voltage Lockout
Von
Voff
Vin increasing
Vin decreasing
—
—
35.5
34
—
—
V
Turn-On Time
ton
Vin =48V step
—
140 (4)
—
ms
4
–0.2
—
—
15
0.8
Output Adjust Range
Over-Current Threshold
Switching Frequency
Enable Control (pins 1 & 2)
High-Level Input Voltage
Low-Level Input Voltage
Low-Level Input Current
Standby Input Current
Io1 (3.3V)
Io2 (2.5V)
Io3 (1.8V)
PT4827
Typ
Vo1
Vo2
Vo3
Vo1
Vo2/Vo3
Vo1
Vo2/Vo3
Vo1
Vo2
Vo3
(1)
(1)
(1)
A
V
V
%Vo
%Vo
%Vo
%Vo
%
mVpp
µSec
%Vo
%Vo
A
kHz
Referenced to –Vin (pin 4)
VIH
VIL
IIL
Iin standby
pins 1 & 2 open circuit
(5)
V
—
1
2
mA
—
1
5
mA
Internal Input Capacitance
Cint
—
1.14
—
External Output Capacitance
Co1
Co2
Co3
V iso
C iso
R iso
0
0
0
1500
—
10
220
220
220
—
2,200
—
1,000
1,000
1,000
—
—
—
Primary/Secondary Isolation
A
µF
(6)
(6)
µF
(6)
V
pF
MΩ
Notes: (1)
(2)
(3)
(4)
(5)
The converter will operate down to no load with reduced specifications.
The sum-total current from outputs Vo1, Vo2, and Vo3 cannot exceed 12ADC.
Limits are specified by design.
Measured from the application of the input voltage to the instance that all outputs are in regulation.
The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –V in allows the the converter to operate when
input power is applied. The maximum open-circuit voltage is 4V.
(6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using.
For technical support and more information, see inside back cover or visit www.ti.com
15
Typical Characteristics
PT4827—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4827 Performance Characteristics
PT4827 Thermal Performance
(See Notes A, B)
(See Note C)
(Io1 + Io2 + Io3 =12A, represents 100% Load)
100
Efficiency vs Output Power
(Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load)
Power Dissipation vs Output Load
8
7
90
6
80
Pd - Watts
Efficiency - %
VIN
36V
48V
75V
70
5
75V
48V
36V
4
3
2
60
1
50
0
0
20
40
60
80
100
0
20
Output Load (%)
100
40
60
80
100
Output Load (%)
Efficiency vs Output Power
(Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load)
Safe Operating Area @Vin =48V
90
80
Ambient Temperature (°C)
Efficiency - %
90
VIN
80
36V
48V
75V
70
60
Airflow
70
200LFM
120LFM
60LFM
Nat Conv
60
50
40
30
50
20
0
20
40
60
80
100
0%
Output Load (%)
100
20%
40%
60%
80%
100%
Output Load (%)
Output Ripple vs Output Power; Vin =48V
(Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load)
80
Ripple - mV
VOUT
60
3.3V
2.5V
1.8V
40
20
0
0
20
40
60
80
100
Output Load (%)
100
Output Ripple vs Output Power; Vin =48V
(Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load)
80
Ripple - mV
VOUT
60
3.3V
2.5V
1.8V
40
20
0
0
20
40
60
80
100
Output Load (%)
Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.
Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition.
Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures.
For technical support and more information, see inside back cover or visit www.ti.com
16
PT4828—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
PT4828 Electrical Specifications
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
(Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5I omax)
PT4828
Typ
Max
—
—
—
—
—
—
5.0
2.5
1.5
±0.5
±0.5
±0.1
±0.1
—
—
86.5
30
30
25
200
5
±10
11
400
5.0 (2)
5.5 (2)
5.5 (2)
9 (2)
75
80
5.1
2.55
1.53
—
—
±0.5
±0.5
±3 (3)
±3 (3)
—
—
—
—
—
—
—
—
450
—
—
35.5
34
—
—
V
—
140 (4)
—
ms
4
–0.2
—
—
15
0.8
Characteristics
Symbols
Conditions
Output Current
Io
Each output
Input Voltage Range
Vin
Total (Io1 + Io2 + Io3)
Continuous
Surge (1 minute)
Set-Point Voltage
Vo
Temperature Variation
Regtemp
–40°C ≤Ta ≤+85°C, Io =Iomin
Line Regulation
Load Regulation
Total Output Voltage Variation
Regline
Regload
∆Vo tol
Efficiency
Vo Ripple/Noise
(0 to 20MHz bandwidth)
η
Vn
All outputs, Over Vin range
All outputs, 0≤Io≤Iomax
Includes set-point, line, load,
–40°C ≤Ta ≤+85°C
Io1 =5A, Io2 =2A, Io3 =2A
Transient Response
ttr
Vos
Voadj
ITRIP
ƒs
0.1A/µs load step, 50% to 75% Iomax
Vo over/undershoot
Vo1/Vo2/Vo3
Total, all outputs. Reset with auto-recovery
Over Vin and Io ranges
0.25
0.1
0.1
—
36
—
4.9
2.45
1.47
—
—
—
—
—
—
—
—
—
—
—
—
—
—
350
Under Voltage Lockout
Von
Voff
Vin increasing
Vin decreasing
Turn-On Time
ton
Vin =48V step
Output Adjust Range
Over-Current Threshold
Switching Frequency
Enable Control (pins 1 & 2)
High-Level Input Voltage
Low-Level Input Voltage
Low-Level Input Current
Standby Input Current
Min
Io1 (5.0V)
Io2 (2.5V)
Io3 (1.5V)
Vo1
Vo2
Vo3
Vo1
Vo2/Vo3
Vo1
Vo2/Vo3
Vo1
Vo2
Vo3
(1)
(1)
(1)
A
A
V
V
%Vo
%Vo
%Vo
%Vo
%
mVpp
µSec
%Vo
%Vo
A
kHz
Referenced to –Vin (pin 4)
VIH
VIL
IIL
Iin standby
pins 1 & 2 open circuit
(5)
V
—
1
2
mA
—
1
5
mA
Internal Input Capacitance
Cint
—
1.14
—
External Output Capacitance
Co1
Co2
Co3
V iso
C iso
R iso
0
0
0
1500
—
10
220
220
220
—
2,200
—
1,000
1,000
1,000
—
—
—
Primary/Secondary Isolation
Units
µF
(6)
(6)
µF
(6)
V
pF
MΩ
Notes: (1)
(2)
(3)
(4)
(5)
The converter will operate down to no load with reduced specifications.
The sum-total current from outputs Vo2, and Vo3 cannot exceed 9ADC.
Limits are specified by design.
Measured from the application of the input voltage to the instance that all outputs are in regulation.
The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –V in allows the the converter to operate when
input power is applied. The maximum open-circuit voltage is 4V.
(6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using.
For technical support and more information, see inside back cover or visit www.ti.com
17
Typical Characteristics
PT4828—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4828 Performance Characteristics
(See Notes A, B)
PT4828 Thermal Performance
(See Note C)
(Io1 + Io2 + Io3 =9A ,represents 100% Load)
100
Efficiency vs Output Power
(Io1 =5A, Io2 =2A, Io3 =2A represents 100% Load)
Power Dissipation vs Output Load
10
90
8
80
VIN
Pd - Watts
Efficiency - %
VIN
36V
48V
75V
70
60
6
75V
48V
36V
4
2
50
0
0
20
40
60
80
100
0
20
Output Load (%)
100
40
60
80
100
Output Load (%)
Efficiency vs Output Power
(Io 1 =2A, Io2 =2A, Io3 =5A represents 100% Load)
Safe Operating Area @Vin =48V
90
Ambient Temperature (°C)
80
90
Efficiency - %
VIN
80
36V
48V
75V
70
60
Airflow
70
200LFM
120LFM
60LFM
Nat Conv
60
50
40
30
20
50
0
20
40
60
80
0%
100
100
20%
40%
60%
80%
100%
Output Load (%)
Output Load (%)
Output Ripple vs Output Power; Vin =48V
(Io1 =5A, Io2 =2A, Io3 =2A represents 100% Load)
80
Ripple - mV
VOUT
60
5.0V
2.5V
1.5V
40
20
0
0
20
40
60
80
100
Output Load (%)
100
Output Ripple vs Output Power; Vin =48V
(Io1 =2A, Io2 =2A, Io3 =5A represents 100% Load)
80
Ripple - mV
VOUT
60
5.0V
2.5V
1.5V
40
20
0
0
20
40
60
80
100
Iout (A)
Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.
Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition.
Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures.
For technical support and more information, see inside back cover or visit www.ti.com
18
PT4829—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
PT4829 Electrical Specifications
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
(Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5I omax)
Characteristics
Symbols
Conditions
Output Current
Io
Each output
Input Voltage Range
Vin
Total (Io1 + Io2 + Io3)
Continuous
Surge (1 minute)
Set-Point Voltage
Vo
Min
Max
—
—
—
—
—
—
5.0
1.8
1.5
±0.5
±0.5
±0.1
±0.1
—
—
86.2
35
25
25
200
5
±10
11
400
5.0 (2)
5.5 (2)
5.5 (2)
9 (2)
75
80
5.1
1.84
1.53
—
—
±0.5
±0.5
±3 (3)
±3 (3)
—
—
—
—
—
—
—
—
450
Units
Temperature Variation
Regtemp
–40°C ≤Ta ≤+85°C, Io =Iomin
Line Regulation
Load Regulation
Total Output Voltage Variation
Regline
Regload
∆Vo tol
Efficiency
Vo Ripple/Noise
(0 to 20MHz bandwidth)
η
Vn
All outputs, Over Vin range
All outputs, 0≤Io≤Iomax
Includes set-point, line, load,
–40°C ≤Ta ≤+85°C
Io1 =5A, Io2 =2A, Io3 =2A
Transient Response
ttr
Vos
Voadj
ITRIP
ƒs
0.1A/µs load step, 50% to 75% Iomax
Vo over/undershoot
Vo1/Vo2/Vo3
Total, all outputs. Reset with auto-recovery
Over Vin and Io ranges
0.25
0.1
0.1
—
36
—
4.9
1.76
1.47
—
—
—
—
—
—
—
—
—
—
—
—
—
—
350
Under Voltage Lockout
Von
Voff
Vin increasing
Vin decreasing
—
—
35.5
34
—
—
V
Turn-On Time
ton
Vin =48V step
—
140 (4)
—
ms
4
–0.2
—
—
15
0.8
Output Adjust Range
Over-Current Threshold
Switching Frequency
Enable Control (pins 1 & 2)
High-Level Input Voltage
Low-Level Input Voltage
Low-Level Input Current
Standby Input Current
Io1 (5.0V)
Io2 (1.8V)
Io3 (1.5V)
PT4829
Typ
Vo1
Vo2
Vo3
Vo1
Vo2/Vo3
Vo1
Vo2/Vo3
Vo1
Vo2
Vo3
(1)
(1)
(1)
A
V
V
%Vo
%Vo
%Vo
%Vo
%
mVpp
µSec
%Vo
%Vo
A
kHz
Referenced to –Vin (pin 4)
VIH
VIL
IIL
Iin standby
pins 1 & 2 open circuit
(5)
V
—
1
2
mA
—
1
5
mA
Internal Input Capacitance
Cint
—
1.14
—
External Output Capacitance
Co1
Co2
Co3
V iso
C iso
R iso
0
0
0
1500
—
10
220
220
220
—
2,200
—
1,000
1,000
1,000
—
—
—
Primary/Secondary Isolation
A
µF
(6)
(6)
µF
(6)
V
pF
MΩ
Notes: (1)
(2)
(3)
(4)
(5)
The converter will operate down to no load with reduced specifications.
The sum-total current from outputs Vo2, and Vo3 cannot exceed 9ADC.
Limits are specified by design.
Measured from the application of the input voltage to the instance that all outputs are in regulation.
The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –V in allows the the converter to operate when
input power is applied. The maximum open-circuit voltage is 4V.
(6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using.
For technical support and more information, see inside back cover or visit www.ti.com
19
Typical Characteristics
PT4829—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4829 Performance Characteristics
(See Notes A, B)
PT4829 Thermal Performance
(See Note C)
(Io1 + Io2 + Io3 =9A, represents 100% Load)
100
Efficiency vs Output Power
(Io1 =5A, Io2 =2A, Io3 =2A represents 100% Load)
Power Dissipation vs Output Power
10
90
8
80
VIN
Pd - Watts
Efficiency - %
VIN
36V
48V
75V
70
60
6
75V
48V
36V
4
2
50
0
0
20
40
60
80
100
0
20
Output Load (%)
100
40
60
80
100
Output Load (%)
Efficiency vs Output Power
(Io1 =2A, Io2 =2A, Io3 =5A represents 100% Load)
Safe Operating Area @Vin =48V
90
80
Ambient Temperature (°C)
90
Efficiency - %
VIN
80
36V
48V
75V
70
60
Airflow
70
200LFM
120LFM
60LFM
Nat Conv
60
50
40
30
50
20
0
20
40
60
80
100
0%
Output Load (%)
100
20%
40%
60%
80%
100%
Output Load (%)
Output Ripple vs Output Power; Vin =48V
(Io1 =5A, Io2 =2A, Io3 =2A represents 100% Load)
80
Ripple - mV
VOUT
60
5.0V
1.5V
1.8V
40
20
0
0
20
40
60
80
100
Output Load (%)
100
Output Ripple vs Output Power; Vin =48V
(Io1 =2A, Io2 =2A, Io3 =5A represents 100% Load)
80
Ripple - mV
VOUT
60
5.0V
1.5V
1.8V
40
20
0
0
20
40
60
80
100
Output Load (%)
Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.
Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition.
Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures.
For technical support and more information, see inside back cover or visit www.ti.com
20
PT4831—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
PT4831 Electrical Specifications
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
(Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5I omax)
Characteristics
Symbols
Conditions
Output Current
Io
Each output
Input Voltage Range
Vin
Total (Io1 + Io2 + Io3)
Continuous
Surge (1 minute)
Set-Point Voltage
Vo
Min
Max
—
—
—
—
—
—
5.0
3.3
1.5
±0.5
±0.5
±0.1
±0.1
—
—
87
40
35
25
200
5
±10
11
400
5.0 (2)
5.5 (2)
5.5 (2)
9 (2)
75
80
5.1
3.36
1.53
—
—
±0.5
±0.5
±3 (3)
±3 (3)
—
—
—
—
—
—
—
—
450
Units
Temperature Variation
Regtemp
–40°C ≤Ta ≤+85°C, Io =Iomin
Line Regulation
Load Regulation
Total Output Voltage Variation
Regline
Regload
∆Vo tol
Efficiency
Vo Ripple/Noise
(0 to 20MHz bandwidth)
η
Vn
All outputs, Over Vin range
All outputs, 0≤Io≤Iomax
Includes set-point, line, load,
–40°C ≤Ta ≤+85°C
Io1 =5A, Io2 =2A, Io3 =2A
Transient Response
ttr
Vos
Voadj
ITRIP
ƒs
0.1A/µs load step, 50% to 75% Iomax
Vo over/undershoot
Vo1/Vo2/Vo3
Total, all outputs. Reset with auto-recovery
Over Vin and Io ranges
0.25
0.1
0.1
—
36
—
4.9
3.24
1.47
—
—
—
—
—
—
—
—
—
—
—
—
—
—
350
Under Voltage Lockout
Von
Voff
Vin increasing
Vin decreasing
—
—
35.5
34
—
—
V
Turn-On Time
ton
Vin =48V step
—
140 (4)
—
ms
4
–0.2
—
—
15
0.8
Output Adjust Range
Over-Current Threshold
Switching Frequency
Enable Control (pins 1 & 2)
High-Level Input Voltage
Low-Level Input Voltage
Low-Level Input Current
Standby Input Current
Io1 (5.0V)
Io2 (3.3V)
Io3 (1.5V)
PT4831
Typ
Vo1
Vo2
Vo3
Vo1
Vo2/Vo3
Vo1
Vo2/Vo3
Vo1
Vo2
Vo3
(1)
(1)
(1)
A
V
V
%Vo
%Vo
%Vo
%Vo
%
mVpp
µSec
%Vo
%Vo
A
kHz
Referenced to –Vin (pin 4)
VIH
VIL
IIL
Iin standby
pins 1 & 2 open circuit
(5)
V
—
1
2
mA
—
1
5
mA
Internal Input Capacitance
Cint
—
1.14
—
External Output Capacitance
Co1
Co2
Co3
V iso
C iso
R iso
0
0
0
1500
—
10
220
220
220
—
2,200
—
1,000
1,000
1,000
—
—
—
Primary/Secondary Isolation
A
µF
(6)
(6)
µF
(6)
V
pF
MΩ
Notes: (1)
(2)
(3)
(4)
(5)
The converter will operate down to no load with reduced specifications.
The sum-total current from outputs Vo1, Vo2, and Vo3 cannot exceed 9ADC.
Limits are specified by design.
Measured from the application of the input voltage to the instance that all outputs are in regulation.
The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –V in allows the the converter to operate when
input power is applied. The maximum open-circuit voltage is 4V.
(6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using.
For technical support and more information, see inside back cover or visit www.ti.com
21
Typical Characteristics
PT4831—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4831 Performance Characteristics
(See Notes A, B)
PT4831 Thermal Performance
(See Note C)
(Io1 + Io2 + Io3 =9A, represents 100% Load)
100
Efficiency vs Output Power
(Io1 =5A, Io2 =2A, Io3 =2A represents 100% Load)
Power Dissipation vs Output Power
10
8
VIN
80
VIN
Pd - Watts
Efficiency - %
90
36V
48V
75V
70
60
6
75V
48V
36V
4
2
50
0
0
20
40
60
80
100
0
20
Output Load (%)
100
40
60
80
100
Output Power (%)
Efficiency vs Output Power
(Io1 =2A, Io2 =2A, Io3 =5A represents 100% Load)
Safe Operating Area @Vin =48V
90
Ambient Temperature (°C)
80
Efficiency - %
90
VIN
80
36V
48V
75V
70
60
Airflow
70
200LFM
120LFM
60LFM
Nat Conv
60
50
40
30
20
50
0
20
40
60
80
0%
100
100
20%
40%
60%
80%
100%
Output Load (%)
Output Load (%)
Output Ripple vs Output Power; Vin =48V
(Io1 =5A, Io2 =2A, Io3 =2A represents 100% Load)
80
Ripple - mV
VOUT
60
3.3V
5.0V
1.5V
40
20
0
0
20
40
60
80
100
Output Load (%)
100
Output Ripple vs Output Power; Vin =48V
(Io1 =2A, Io2 =2A, Io3 =5A represents 100% Load)
80
Ripple - mV
VOUT
60
3.3V
5.0V
1.5V
40
20
0
0
20
40
60
80
100
Output Load (%)
Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.
Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition.
Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures.
For technical support and more information, see inside back cover or visit www.ti.com
22
PT4832—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
PT4832 Electrical Specifications
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
(Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5I omax)
PT4832
Typ
Max
—
—
—
—
—
—
5.0
3.3
2.5
±0.5
±0.5
±0.1
±0.1
—
—
86.7
30
25
25
200
5
±10
11
400
5.0 (2)
5.5 (2)
5.5 (2)
9 (2)
75
80
5.1
3.36
2.55
—
—
±0.5
±0.5
±3 (3)
±3 (3)
—
—
—
—
—
—
—
—
450
—
—
35.5
34
—
—
V
—
140 (4)
—
ms
4
–0.2
—
—
15
0.8
Characteristics
Symbols
Conditions
Output Current
Io
Each output
Input Voltage Range
Vin
Total (Io1 + Io2 + Io3)
Continuous
Surge (1 minute)
Set-Point Voltage
Vo
Temperature Variation
Regtemp
–40°C ≤Ta ≤+85°C, Io =Iomin
Line Regulation
Load Regulation
Total Output Voltage Variation
Regline
Regload
∆Vo tol
Efficiency
Vo Ripple/Noise
(0 to 20MHz bandwidth)
η
Vn
All outputs, Over Vin range
All outputs, 0≤Io≤Iomax
Includes set-point, line, load,
–40°C ≤Ta ≤+85°C
Io1 =5A, Io2 =2A, Io3 =2A
Transient Response
ttr
Vos
Voadj
ITRIP
ƒs
0.1A/µs load step, 50% to 75% Iomax
Vo over/undershoot
Vo1/Vo2/Vo3
Total, all outputs. Reset with auto-recovery
Over Vin and Io ranges
0.25
0.1
0.1
—
36
—
4.9
3.24
2.45
—
—
—
—
—
—
—
—
—
—
—
—
—
—
350
Under Voltage Lockout
Von
Voff
Vin increasing
Vin decreasing
Turn-On Time
ton
Vin =48V step
Output Adjust Range
Over-Current Threshold
Switching Frequency
Enable Control (pins 1 & 2)
High-Level Input Voltage
Low-Level Input Voltage
Low-Level Input Current
Standby Input Current
Min
Io1 (5.0V)
Io2 (3.3V)
Io3 (2.5V)
Vo1
Vo2
Vo3
Vo1
Vo2/Vo3
Vo1
Vo2/Vo3
Vo1
Vo2
Vo3
(1)
(1)
(1)
A
A
V
V
%Vo
%Vo
%Vo
%Vo
%
mVpp
µSec
%Vo
%Vo
A
kHz
Referenced to –Vin (pin 4)
VIH
VIL
IIL
Iin standby
pins 1 & 2 open circuit
(5)
V
—
1
2
mA
—
1
5
mA
Internal Input Capacitance
Cint
—
1.14
—
External Output Capacitance
Co1
Co2
Co3
V iso
C iso
R iso
0
0
0
1500
—
10
220
220
220
—
2,200
—
1,000
1,000
1,000
—
—
—
Primary/Secondary Isolation
Units
µF
(6)
(6)
µF
(6)
V
pF
MΩ
Notes: (1)
(2)
(3)
(4)
(5)
The converter will operate down to no load with reduced specifications.
The sum-total current from outputs Vo2, and Vo3 cannot exceed 9ADC.
Limits are specified by design.
Measured from the application of the input voltage to the instance that all outputs are in regulation.
The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –V in allows the the converter to operate when
input power is applied. The maximum open-circuit voltage is 4V.
(6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using.
For technical support and more information, see inside back cover or visit www.ti.com
23
Typical Characteristics
PT4832—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4832 Performance Characteristics
PT4832 Thermal Performance
(See Notes A, B)
(See Note C)
(Io1 + Io2 + Io3 =9A, represents 100% Load)
100
Efficiency vs Output Power
(Io1 =5A, Io2 =2A, Io3 =2A represents 100% Load)
Power Dissipation vs Output Power
8
90
80
VIN
Pd - Watts
Efficiency - %
6
VIN
36V
48V
75V
70
36V
48V
75V
4
2
60
50
0
0
20
40
60
80
100
0
20
Output Load (%)
100
40
60
80
100
Output Load (%)
Efficiency vs Output Power
(Io1 =2A, Io2 =2A, Io3 =5A represents 100% Load)
Safe Operating Area @Vin =48V
90
80
Ambient Temperature (°C)
Efficiency - %
90
VIN
80
36V
48V
75V
70
60
Airflow
70
200LFM
120LFM
60LFM
Nat Conv
60
50
40
30
50
20
0
20
40
60
80
100
0%
Output Load (%)
100
20%
40%
60%
80%
100%
Output Load (%)
Output Ripple vs Output Power; Vin =48V
(Io1 =5A, Io2 =2A, Io3 =2A represents 100% Load)
80
Ripple - mV
VOUT
60
5.0V
3.3V
2.5V
40
20
0
0
20
40
60
80
100
Output Load (%)
100
Output Ripple vs Output Power; Vin =48V
(Io1 =2A, Io2 =2A, Io3 =5A represents 100% Load)
80
Ripple - mV
VOUT
60
5.0V
3.3V
2.5V
40
20
0
0
20
40
60
80
100
Output Load (%)
Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.
Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition.
Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures.
For technical support and more information, see inside back cover or visit www.ti.com
24
PT4833—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
PT4833 Electrical Specifications
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
(Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5I omax)
Min
PT4833
Typ
Max
0.1A/µs load step, 50% to 75% Iomax
Vo over/undershoot
Vo1/Vo2/Vo3
Total, all outputs. Reset with auto-recovery
Over Vin and Io ranges
0.25 (1)
0.1 (1)
0.1 (1)
—
36
—
3.24
1.96
1.47
—
—
—
—
—
—
—
—
—
—
—
—
—
—
350
—
—
—
—
—
—
3.3
2.0
1.5
±0.5
±0.5
±0.1
±0.1
—
—
86
40
25
25
200
3
±10
14
400
8 (2)
6 (2)
6 (2)
12 (2)
75
80
3.36
2.04
1.53
—
—
±0.5
±0.5
±3 (3)
±3 (3)
—
—
—
—
—
—
—
—
450
Von
Voff
Vin increasing
Vin decreasing
—
—
35.5
34
—
—
V
ton
Vin =48V step
—
140 (4)
—
ms
4
–0.2
—
—
15
0.8
Characteristics
Symbols
Conditions
Output Current
Io
Each output
Input Voltage Range
Vin
Total (Io1 + Io2 + Io3)
Continuous
Surge (1 minute)
Set-Point Voltage
Vo
Temperature Variation
Regtemp
–40°C ≤Ta ≤+85°C, Io =Iomin
Line Regulation
Load Regulation
Total Output Voltage Variation
Regline
Regload
∆Vo tol
Efficiency
Vo Ripple/Noise
(0 to 20MHz bandwidth)
η
Vn
All outputs, Over Vin range
All outputs, 0≤Io≤Iomax
Includes set-point, line, load,
–40°C ≤Ta ≤+85°C
Io1 =6A, Io2 =2A, Io3 =2A
Transient Response
ttr
Vos
Voadj
ITRIP
ƒs
Under Voltage Lockout
Turn-On Time
Output Adjust Range
Over-Current Threshold
Switching Frequency
Enable Control (pins 1 & 2)
High-Level Input Voltage
Low-Level Input Voltage
Low-Level Input Current
Standby Input Current
Io1 (3.3V)
Io2 (2.0V)
Io3 (1.5V)
Vo1
Vo2
Vo3
Vo1
Vo2/Vo3
Vo1
Vo2/Vo3
Vo1
Vo2
Vo3
A
A
V
V
%Vo
%Vo
%Vo
%Vo
%
mVpp
µSec
%Vo
%Vo
A
kHz
Referenced to –Vin (pin 4)
VIH
VIL
IIL
Iin standby
pins 1 & 2 open circuit
(5)
V
—
1
2
mA
—
1
5
mA
Internal Input Capacitance
Cint
—
1.14
—
External Output Capacitance
Co1
Co2
Co3
V iso
C iso
R iso
0
0
0
1500
—
10
220
220
220
—
2,200
—
1,000
1,000
1,000
—
—
—
Primary/Secondary Isolation
Units
µF
(6)
(6)
µF
(6)
V
pF
MΩ
Notes: (1)
(2)
(3)
(4)
(5)
The converter will operate down to no load with reduced specifications.
The sum-total current from outputs Vo1, Vo2, and Vo3 cannot exceed 12ADC.
Limits are specified by design.
Measured from the application of the input voltage to the instance that all outputs are in regulation.
The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –V in allows the the converter to operate when
input power is applied. The maximum open-circuit voltage is 4V.
(6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using.
For technical support and more information, see inside back cover or visit www.ti.com
25
Typical Characteristics
PT4833—48V
35-W Triple Output Isolated DC/DC
Converter for Logic Applications
SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003
PT4833 Performance Characteristics
(See Note A, B)
PT4833 Thermal Performance
(See Note C)
(Io1 + Io2 + Io3 =12A, represents 100% Load)
100
Efficiency vs Output Power
(Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load)
Power Dissipation vs Output Load
10
8
VIN
80
VIN
Pd - Watts
Efficiency - %
90
36V
48V
75V
70
60
6
75V
48V
36V
4
2
50
0
0
20
40
60
80
100
0
20
Output Load (%)
100
40
60
80
100
Output Load (%)
Efficiency vs Output Power
(Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load)
Safe Operating Area @Vin =48V
90
Ambient Temperature (°C)
80
Efficiency - %
90
VIN
80
36V
48V
75V
70
60
Airflow
70
200LFM
120LFM
60LFM
Nat Conv
60
50
40
30
20
50
0
20
40
60
80
0%
100
100
20%
40%
60%
80%
100%
Output Power (%)
Output Load (%)
Output Ripple vs Output Power; Vin =48V
(Io1 =8A, Io2 =2A, Io3 =2A represents 100% Load)
80
Ripple - mV
VOUT
60
3.3V
2.0V
1.5V
40
20
0
0
20
40
60
80
100
Output Load (%)
100
Output Ripple vs Output Power; Vin =48V
(Io1 =4A, Io2 =4A, Io3 =4A represents 100% Load)
80
Ripple - mV
VOUT
60
3.3V
2.0V
1.5V
40
20
0
0
20
40
60
80
100
Output Load (%)
Note A: All Characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.
Note B: Output Load (%) represents the percent drawn from each output of the stated 100% load condition.
Note C: SOA curves represent operating conditions at which the internal components are at or below the manufacturer’s maximum rated operating temperatures.
For technical support and more information, see inside back cover or visit www.ti.com
26
Application Notes
PT4820 Series
Operating Features of the PT4820 Triple-Output
DC/DC Converters
Short-Circuit Protection
Figure 1-1; Vo1, Vo2, Vo3 Power-Up Sequence
To protect against load faults the PT4820 series of tripleoutput DC/DC converters incorporate output short-circuit
protection. When the combined output current from all
three outputs exceeds the over-current threshold (see data
sheet specifications), the PT4820 shuts down after a short
period of typically 15ms. This forces the output voltage
at all three regulated outputs to simultaneously fall to zero.
Following shutdown, the module automatically attempts
to recover by executing a soft-start power-up. This occurs
at intervals of approximately 65ms. If the load fault persists,
the module will continually cycle through successive overcurrent trips and restarts.
Vo1 (0.5V/Div)
Vo2 (0.5V/Div)
Vo3 (0.5V/Div)
Over-Temperature Protection
The PT4820 DC/DC converter series have an internal
temperature sensor, which monitors the temperature of
the module’s metal case. If the case temperature exceeds
a nominal 110°C the converter will shut down. The
converter will automatically restart when the sensed
temperature returns to about 100°C.
Under-Voltage Lock-Out
The Under-Voltage Lock-Out (UVLO) circuit prevents
operation of the converter whenever the input voltage to
the module is insufficient to maintain output regulation.
The UVLO has approximately 2V of hysterisis. This is
to prevent oscillation with a slowly changing input voltage.
Below the UVLO threshold the module is off and the
enable control inputs, EN1 and EN2 are inoperative.
On/Off Output Voltage Sequencing
The power-up characteristic of the PT4820 series of
DC/DC converters meets the requirements of microprocessor and DSP chipsets. All three outputs are internally
sequenced to power-up in unison. Figure 1-1 shows the
PT4820 output voltage rise times and characteristic
shapes after either power is applied to the input of the
converter, or the converter is enabled using one of the
enable control inputs. All three output voltages rise
simultaneously and monotonically until each reaches its
respective output voltage. There is no turn-on overshoot
and the output voltages are proportional to each other
during power on.
HORIZ. SCALE: 2ms/Div
Primary-Secondary Isolation
The PT4820 series of DC/DC converters incorporate
electrical isolation between the input terminals (primary)
and the output terminals (secondary). All converters are
production tested to a withstand voltage of 1500VDC.
The isolation complies with UL60950 and EN60950,
and the requirements for operational isolation. This
allows the converter to be configured for either a positive
or negative input voltage source.
The regulation control circuitry for these modules is
located on the secondary (output) side of the isolation
barrier. Control signals are passed between the primary
and secondary sides of the converter. The data sheet ‘Pin
Descriptions’ and ‘Pin-Out Information’ provides guidance as to which reference, primary or secondary, each
pin is associated.
Input Current Limiting
The converter is not internally fused. For safety and
overall system protection, the maximum input current to
the converter must be limited. Active or passive current
limiting can be used. Passive current limiting can be a
fast acting fuse. A 125-V fuse, rated no more than 5A, is
recommended. Active current limiting can be implemented with a current limited “Hot-Swap” controller.
Turn-On Time
The turn-on on time varies with the input voltage. The
typical turn-on time (measured from the application of a
valid input voltage to instance all outputs are in regulation)
is typically 140 milliseconds at Vin =48V. The rise time
of the output voltage is between 10 and 15 milliseconds.
For technical support and more information, see inside back cover or visit www.ti.com
27
Application Notes
PT4820 Series
Using the On/Off Enable Controls on the PT4820
Series of Triple Output DC/DC Converters
The PT4820 (48V input) series of triple-output DC/DC
converters incorporate two output enable controls. EN1
(pin 1) is the Positive Enable input, and EN2 (pin 2) is the
Negative Enable input. Both inputs are electrically referenced to -Vin (pin 4) on the primary or input side of the
converter. The Enable pins are ideally controlled with an
open-collector (or open-drain) discrete transistor. A pullup resistor is not required. If a pull-up resistor is added,
the pull-up voltage must be limited to 15V.
Negative Output Enable (Positive Inhibit)
Automatic (UVLO) Power-Up
Figure 2-2; Negative Enable Configuration
Connecting EN2 (pin 2) to -Vin (pin 4) and leaving EN1
(pin 1) open-circuit configures the converter for automatic power up. (See data sheet “Typical Application”).
The converter control circuitry incorporates an “Under
Voltage Lockout” (UVLO) function, which disables the
converter until the minimum specified input voltage is
present at ±Vin. (See data sheet Specifications). The UVLO
circuitry ensures a clean transition during power-up and
power-down, allowing the converter to tolerate a slowrising input voltage. For most applications EN1 and
EN2, can be configured for automatic power-up.
To configure the converter for a negative enable function,
EN1 (pin 1) is left open circuit, and the system On/Off
control signal is applied to EN2 (pin 2). Applying less
than 0.8V (with respect to -Vin potential) to pin 2, enables
the converter outputs. An example using a buffer transistor
is again detailed in Figure 2-2. Note: The converter will
only produce and output voltage if a valid input voltage is
applied to ±Vin.
DC/DC
Module
1
2
EN 1
EN 2
BSS138
1 =Outputs On
–VIN
4
–Vin
Positive Output Enable (Negative Inhibit)
To configure the converter for a positive enable function, connect EN2 (pin 2) to -Vin (pin 4), and apply the
system On/Off control signal to EN1 (pin 1). In this
configuration, applying less than 0.8V (with respect to
-Vin potential) to pin 1 disables the converter outputs.
Figure 2-1 is an example of this implemention using a
buffer transistor.
Figure 2-1; Positive Enable Configuration
On/Off Enable Turn-On Time
When the On/Off enable inputs, EN1 or EN2 are used
to enable the PT4820's output voltages, the turn-on
delay time (measured from the transition of the enable
signal to the instance the outputs begin to rise) will vary
with the input voltage and the module’s internal timing.
At an input voltage of 48V, the total turn-on time is
between 20 and 60 milliseconds. This turn-on time
reduces as the input voltage is increased. The rise time
of the output voltages is between 10 and 15 milliseconds.
DC/DC
Module
1
2
BSS138
EN 1
EN 2
1 =Outputs Off
–VIN
4
–Vin
For technical support and more information, see inside back cover or visit www.ti.com
28
Application Notes
PT4820 Series
Adjusting the Output Voltages of the PT4820
Triple-Output DC/DC Converters
The output voltages of the PT4820 series of triple-output
DC/DC converters, Vo1, Vo2 and Vo3 are independently
adjustable. The adjustment method uses a single external
resistor, 1 which may be used to adjust a selected output
by up to a nominal ±10% from the factory preset value.
The value of the resistor determines the magnitude of
adjustment, and the placement of the resistor determines
the direction of adjustment (up or down). Resistor values can be calculated using the appropriate formula (see
below) and the constants provided in Table 3-2. Alternatively the value may be selected directly from Table
3-3. The placement of each resistor is detailed as follows.
Table 3-1; Adjust Resistor Pin Connections
To Adjust Up
Connect R1
from
to
Vox Adj
To Adjust Down
Connect (R2)
from
to
Vox Adj
Vox
Vo1
11
COM
10
11
12
Vo2
15
14
15
16
Vo3
19
18
19
20
Calculation of Adjust Values
Adjust Up: To increase a specific output, add a resistor R1
between the appropriate Vox Adj (Vo1 Adj, Vo2 Adj, or
Vo3 Adj) and the output common (COM). See Figure 3-1(a) and Table 3-1 for the resistor placement and
pin connections.
The adjust resistor values may be calculated. Use the
applicable formula and select the appropriate constants
from Table 2 for the output and model being adjusted.
R1 [Adjust Up] 3
=
Ro · Vr
Va – Vo
– Rs
kΩ
(R2) [Adjust Down] 3
=
Ro (Va – Vr )
Vo – Va
– Rs
kΩ
Figure 3-1a
PT4820
+Vo x
#
+Vox
(Adjusted Up)
+Vx Adj
Where: Vo
Va
Vr
Ro
Rs
#
R1
COM
9,10,14,18
Output
Common
=
=
=
=
=
Original output voltage
Adjusted output voltage
The reference voltage from Table 3-2
The resistance value in Table 3-2
The series resistance from Table 3-2
# - See Table 3-1 for pin connections,
where Vo x equals Vo 1, Vo 2, or Vo 3
Adjust Down: Add a resistor (R2), between the appropriate
Vox Adj (Vo1, Vo2, or Vo3) and the output being adjusted.
See Figure 3-1(b) and Table 1 for the resistor placement
and pin connections.
Figure 3-1b
Notes:
1. Use only a single 1% (or better) tolerance resistor in
either the R1 or (R2) location to adjust a specific output.
Place the resistor as close to the ISR as possible.
2. Never connect capacitors to any of the ‘Vox Adj’ pins. Any
capacitance added to these control pins will affect the
stability of the respective regulated output.
3. Adjustments made to any output must also comply with
the following limitations.
PT4820
+Vo x
#
Vo1
Vo1
+Vox
≥ (Vo2 + 0.5V), and
≥ (Vo3 + 0.5V)
(Adjusted Down)
(R 2)
+Vx Adj
COM
#
9,10,14,18
Output
Common
# - See Table 3-1 for pin connections,
where Vo x equals Vo 1, Vo 2, or Vo 3
For technical support and more information, see inside back cover or visit www.ti.com
29
Application Notes continued
PT4820 Series
Table 3-2
Vo1, Vo2, & Vo3 OUTPUT VOLTAGE ADJUSTMENT RANGE AND FORMULA PARAMETERS
Vo (nom)
Va (min)
Va (max)
Vr
Ω)
Ro (kΩ
Ω)
Rs (kΩ
5.0V
4.5V
5.5V
1.225V
15.4
33.2
3.3V
2.97V
3.63V
1.225V
11.0
40.2
2.5V
2.25V
2.75V
1.225V
10.2
40.2
2.0V
1.8V
2.2V
1.225
10.2
24.9
1.8V
1.62V
1.98V
1.225V
12.1
22.1
1.5V
1.35V
1.65V
1.225V
7.5
5.36
1.2V
1.08V
1.32V
1.003V
9.76
3.65
Table 3-3
Vo1, Vo2, & Vo3 OUTPUT VOLTAGE ADJUST RESISTOR VALUES (See Note 3 for adjustment limitations)
Vo (nom)
Va (req’d)
5.0V
3.3V
2.5
Vo (nom)
Va (req’d)
2.0V
1.8V
1.5V
1.2V
2.25
(1.6)kΩ
1.080
2.3
(14.6)kΩ
1.100
(5.8)kΩ
2.35
(36.3)kΩ
1.120
(10.6)kΩ
2.4
(79.6)kΩ
1.140
(18.6)kΩ
2.45
(210.0)kΩ
1.160
(34.7)kΩ
1.180
(82.7)kΩ
2.5
2.55
(2.6)kΩ
210.0kΩ
1.200
2.6
84.7kΩ
1.220
486.0kΩ
2.65
43.1kΩ
1.240
241.0kΩ
2.7
22.3kΩ
1.260
160.0kΩ
2.75
9.8kΩ
1.280
119.0kΩ
94.2kΩ
2.97
(18.0)kΩ
1.300
3.0
(24.9)kΩ
1.320
3.05
(40.1)kΩ
1.350
(0.9)kΩ
3.1
(62.9)kΩ
1.375
(3.6)kΩ
3.15
(101.0)kΩ
1.400
(7.8)kΩ
3.2
(177.0)kΩ
1.425
(14.6)kΩ
3.25
(405.0)kΩ
1.450
(28.4)kΩ
1.475
(69.6)kΩ
3.3
3.35
77.9kΩ
229.0kΩ
1.500
3.4
94.5kΩ
1.525
362.0kΩ
3.45
49.6kΩ
1.550
178.0kΩ
3.5
27.2kΩ
1.575
117.0kΩ
3.55
13.7kΩ
1.600
3.6
4.7kΩ
1.620
(4.5)kΩ
71.2kΩ
3.63
0.6kΩ
1.650
(12.2)kΩ
55.9kΩ
1.700
(35.4)kΩ
•
86.5kΩ
4.5
(67.7)kΩ
1.750
4.6
(96.7)kΩ
1.800
(4.4)kΩ
4.7
(145.0)kΩ
1.850
(17.6)kΩ
274.0kΩ
4.8
(242.0)kΩ
1.900
(43.9)kΩ
126.0kΩ
4.9
(533.0)kΩ
1.950
(123.0)kΩ
76.7kΩ
5.0
(105.0)kΩ
2.000
5.1
155.0kΩ
2.050
225.0kΩ
5.2
61.1kΩ
2.100
100.0kΩ
5.3
29.7kΩ
2.150
58.4kΩ
5.4
14.0kΩ
2.200
37.6kΩ
5.5
4.5kΩ
R1 = (Blue)
R2 = Black
For technical support and more information, see inside back cover or visit www.ti.com
30
Application Notes
PT4820 Series
VDE Approved Installation Instructions (Installationsanleitung)
Nennspannnug (Rated Voltage):
PT4820 36 to 72 Vdc, Transient to 80Vdc
Nennaufnahme (Rated Input):
PT4820
Nennleistung (Rated Power):
40 Watts Maximum
Ausgangsspannung (Sec. Voltage):
PT4820 Series
PT4821, +3.3/ +2.5/ +1.5 Vdc; 8.0/ 6.0/ 6.0 Adc; Max total is 12Adc
PT4822, +3.3/ +1.8/ +1.5 Vdc; 8.0/ 6.0/ 6.0 Adc; Max total is 12Adc
PT4823, +3.3/ +2.5/ +1.2 Vdc; 8.0/ 6.0/ 6.0 Adc; Max total is 12Adc
PT4824, +3.3/ +1.8/ +1.2 Vdc; 8.0/ 6.0/ 6.0 Adc; Max total is 12Adc
PT4825, +3.3/ +1.5/ +1.2 Vdc; 8.0/ 6.0/ 6.0 Adc; Max total is 12Adc
PT4826, +5.0/ +3.3/ +1.8 Vdc; 5.0/ 5.5 /5.5 Adc; Max total is 9Adc
PT4827, +3.3/ +2.5/ +1.8 Vdc; 8.0/ 6.0 /6.0 Adc; Max total is 12Adc
PT4828, +5.0/ +2.5/ +1.5 Vdc; 5.0/ 5.5 /5.5 Adc; Max total is 9Adc
PT4829, +5.0/ +1.8/ +1.5 Vdc; 5.0/ 5.5 /5.5 Adc; Max total is 9Adc
PT4831, +5.0/ +3.3/ +1.5 Vdc; 5.0/ 5.5 /5.5 Adc; Max total is 9Adc
PT4832, +5.0/ +3.3/ +2.5 Vdc; 5.0/ 5.5 /5.5 Adc; Max total is 9Adc
Ausgangsstrom (Sec. Current):
oder (or)
Ausgangsleistung (Sec. Power):
1.5 Adc
Angabe der Umgebungstemperatur
(Information on ambient temperature): +85 °C maximum as tested
Besondere Hinweise (Special Instructions):
Es ist vorzusehen, daß die Spannungsversorgung in einer Endanwendung über eine isolierte
Sekundaerschaltung bereit gestellt wird. Die Eingangspannung der Spannungsversorgungsmodule muss
eine verstaerkte Isolierung von der Wechselstromquelle aufweisen.
Die Spannungsversorgung muss gemaess den Gehaeuse-, Montage-, Kriech- und Luftstrecken-,
Markierungs- und Trennanforderungen der Endanwendung installiert werden.
(The power supply is intended to be supplied by isolated secondary circuitry in an end use application.
The input power to these power supplies shall have reinforced insulation from the AC mains.
The power supply shall be installed in compliance with the enclosure, mounting, creepage, clearance,
casualty, markings, and segregation requirements of the end-use application.
Offenbach,
VDE Prüf- und Zertifizierungsinstitut
Abteilung / Department TD
Ort / Place:
Datum / Date: Nov 6, 2002
(Stempel und Unterschrift des Herstellers / Stamp
and signature of the manufacturer)
(Jürgen Bärwinkel)
For technical support and more information, see inside back cover or visit www.ti.com
31
PACKAGE OPTION ADDENDUM
www.ti.com
10-Jan-2013
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package Qty
Drawing
PT4821C
OBSOLETE SIP MODULE
ENP
21
PT4823C
PT4826A
LIFEBUY SIP MODULE
ENP
21
LIFEBUY SIP MODULE
ENN
21
PT4826C
LIFEBUY SIP MODULE
ENP
PT4828C
LIFEBUY SIP MODULE
PT4829C
LIFEBUY SIP MODULE
PT4831C
PT4833C
Eco Plan
Lead/Ball Finish
MSL Peak Temp
Samples
(3)
(Requires Login)
(2)
TBD
Call TI
Call TI
8
TBD
Call TI
Level-3-215C-168HRS
8
TBD
Call TI
Level-1-215C-UNLIM
21
8
TBD
Call TI
Level-3-215C-168HRS
ENP
21
8
TBD
Call TI
Level-3-215C-168HRS
ENP
21
8
TBD
Call TI
Level-3-215C-168HRS
OBSOLETE SIP MODULE
ENP
21
TBD
Call TI
Call TI
LIFEBUY SIP MODULE
ENP
21
TBD
Call TI
Level-3-215C-168HRS
8
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
Addendum-Page 1
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