TI PT4310

PT4310 Series —48V
6-W Low-Profile Dual-Output
Isolated DC-DC Converter
SLTS146A
(Revised 7/20/2001)
Features
•
•
•
•
•
•
•
•
Dual Complimentary Outputs
Wide Input Voltage: 38V to 75V
1,500 VDC Isolation
9 Pin DIP Package
Low-Profile (8mm)
Pin-compatible with PT4300 Series
No External Components Required
Safety Approvals —Pending
Description
Ordering Information
The PT4310 modules are a low-power,
complimentary dual-output, series of isolated
DC/DC converters. The PT4310 series is pincompatible 1 with the PT4300 series, and has
improved temperature compensation. These
modules are an ideal alternative to the PT4300
for both new and existing designs.
Applications include Telecom and Datacom
systems where both board space and height are a
premium.
The PT4310 series is offered in an openframe lightweight package, and is available in
both through-hole or SMD-DIP package types.
The output voltages are adjustable and include
both ±5V, and ±12V.
PT4311G
PT4313G
Pin-Out Information
= ±5V/1.2A
= ±12V/0.5A
Pin
+Vout
2
COM
3
–Vout
8
N/C
PT Series Suffix (PT1234X)
9
N/C
Pin Configuration
11 Remote On/Off #
Through-Hole
Surface Mount
A
C
(For dimensions and PC board layout, see
Package Style 920)
12 ±Vout Adjust #
17 –Vin
18 +Vin
Package Top View
+Vout
COM
–Vout
1
2
3
18
17
+Vin
–Vin
12
11
±Vo Adjust
#
Remote On/Off #
PT4310
N/C
N/C
8
9
Function
1
# For more information on the Remote On/Off control and
output voltage adustment, refer to the application notes.
For technical support and more information, see inside back cover or visit www.ti.com
PT4310 Series —48V
6-W Low-Profile Dual-Output
Isolated DC-DC Converter
Specifications
(Unless otherwise stated, Ta =25°C, Vin =53V, C out =0µF, and Io 1 = Io2 =Io typ)
Characteristic
Symbol
Ouput Power
Output Current
Po(tot)
Io1, Io2
Io1 +
Conditions
(2)
Io2 (2)
Min
Over Vin range
Each output
PT4311 ( ±5V)
PT4313 (±12V)
PT4311
PT4313
Total, both outputs
Input Voltage Range
Set Point Voltage
Vin
Vo1, Vo2
Over Io(tot) range
Temperature Variation
Regtemp
–40° >Ta > +85°C
Line Regulation
Load Regulation
Regline
Regload
Total Output Voltage Variation
∆Votot
No-load Output Voltage
Vo(no-load)
Over Vin range
Io1 =0.6A, 0.2A ≤ Io2 ≤ 0.6A
Io1 =0.25A, 0.05A ≤ Io2 ≤ 0.25A
Over Vin range and load limits
–40° >Ta > +85°C
Io1 =Io2 = 0
Efficiency
η
Vo Ripple (pk-pk)
Vr
Transient Response
ttr
∆Vtr
Current Limit Threshold
Short Circuit Current
Inrush Current
Switching Frequency
Under-Voltage Lockout
Remote On/Off (Pin 11)
Input Requirements
Standby Input Current
Internal Input Capacitance
External Output Capacitance
PT4311
PT4313
PT4311
PT4313
(2)
ILim
Isc
Iir
tir
ƒo
UVLO
VIH
VIL
IIL
Iin standby
Cin
Cout
PT4311
PT4313
PT4311
PT4313
PT4311
PT4313
PT4311
PT4313
20MHz bandwidth
PT4311
PT4313
20% ≤ Io2 ≤ 75%Iotyp, with 25%load step
Vo over/undershoot
PT4311
PT4313
Over Vin range, ∆Vo =10%Vonom
On start-up
Over Vin range
Referenced to –Vin (pin 17)
pins 11 & 17 connected
Total across both outputs
Isolation Voltage
Capacitance
Resistance
Maximum Operating
Temperature Range
Storage Temperature
Reliability
Input - output
Ta
Over Vin range
Ts
MTBF
Mechanical Shock
—
Mechanical Vibration
—
Weight
Flammability
—
—
—
Per Bellcore TR-332
50% stress, Ta =40°C, ground benign
Per Mil-Std-883D, method 2002.3,
1mS, half-sine, mounted to a fixture
Per Mil-Std-883D, method 2007.2,
20-2000Hz, soldered in a PC board
—
Materials meet UL 94V-0
PT4311
PT4313
PT4310 SERIES
Typ
Max
Units
—
—
6
W
0.2 (3)
0.05 (3)
0.4
0.1
38.0
4.95
11.85
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
400
—
5.0
–0.1
—
—
—
0
0
1500
—
10
-40
0.6
0.25
—
—
—
5.05
12
±0.5
±1
±25
100
250
±5
±4
5.4
12.7
82
85
50
90
200
±75
±200
2.5
1.0
0.5
1.0
—
36
—
—
–0.2
10
1
—
—
—
1100
—
—
1.0
0.45
1.2
0.5
75.0
5.15
12.15
—
—
±40
150
350
—
—
5.9
17
—
—
100
150
—
—
—
—
—
—
—
520
—
Open (4)
+1.0
–
—
—
120 (5)
(5)
47
—
—
—
+85 (6)
A
V
pF
MΩ
°C
A
V
V
mV
%Vo
mV
mV
%Vo
V
%
mVpp
µs
mV
A
A
A
ms
kHz
V
V
mA
mA
µF
µF
-40
—
+125
°C
4.0
—
—
106 Hrs
—
TBD
—
G’s
—
TBD
—
G’s
—
10
—
grams
Notes: (1)
(2)
(3)
(4)
The adjustment of the output voltage for the PT4310 series is different than the PT4300 series.
Vo1 & Vo2 may refer to +Vout and –Vout, or –Vout and +Vout respectively. The specification limits are quoted absolute.
The DC/DC converter will operate at no load with reduced specifications. See “No-load Output Voltage” specification.
The Remote On/Off (pin 11) has an internal pull-up. If the pin is left open the module will operate when input power is applied. Refer to the application
notes for interface considerations.
(5) Output capacitors are not required for proper operation. If added, Oscon® or tantalum types are recommended for operation below 0°C ambient.
(6) See Safe Operating Area curves or contact the factory for the appropriate derating.
For technical support and more information, see inside back cover or visit www.ti.com
Typical Characteristics
PT4310 Series —48V
6-W Low-Profile Dual-Output
Isolated DC-DC Converter
PT4311 (±5V) Characteristic Data
(See Note A)
PT4313 (±12V) Characteristic Data
Efficiency vs. Total Output Current ( Io 1 + Io2 )
Efficiency vs. Total Output Current ( Io 1 + Io2 )
90
90
80
V IN
38V
53V
75V
70
Efficiency - %
Efficiency - %
80
VIN
38V
53V
75V
70
60
60
50
50
0.2
0.4
0.6
0.8
1
0
1.2
0.1
0.2
0.3
0.4
0.5
Io1 + Io2 (A)
Io1 + Io2 (A)
Output Ripple vs. Load ( Io1 or Io 2 )
Output Ripple vs. Load ( Io1 or Io2 )
100
120
100
80
VIN
60
38V
53V
75V
40
VIN
80
Ripple - mV
Ripple - mV
(See Note A)
38V
53V
75V
60
40
20
20
0
0
0
0.2
0.4
0.6
0.8
1
0
0.1
0.2
Iout (A)
0.4
0.5
Power Dissipation vs. Total Output Current ( Io1 + Io2 )
Power Dissipation vs Output Current ( Io1 + Io2 )
2
1.6
1.5
1.2
75V
53V
38V
0.8
VIN
Pd - Watts
VIN
Pd - Watts
0.3
Iout (A)
75V
53V
38V
1
0.5
0.4
0
0.0
0.2
0.4
0.6
0.8
1
0
1.2
0.1
0.2
0.3
0.4
0.5
Io1 + Io2 (A)
Io1 + Io2 (A)
Temperature Drift; Io2 =0.1A (See Note B)
Temperature Drift; Io2 =0.2A (See Note B)
100
50
50
Io1 (A)
0.2
0.4
0.6
0.8
1.0
0
Io1 (A)
∆Vo1 (mV)
∆Vo1 (mV)
25
0.4
0.3
0.2
0.1
0
-50
-25
-100
-50
-150
-50
-25
0
25
50
75
100
Ta (°C)
-50
-25
0
25
50
Ta (°C)
Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the Converter.
Note B: Drift with temperature is normalized to the static output voltage measured at 25°C.
For technical support and more information, see inside back cover or visit www.ti.com
75
100
Typcial Characteristics
PT4310 Series —48V
6-W Low-Profile Dual-Output
Isolated DC-DC Converter
PT4311 (±5V) Characteristic Data
PT4313 (±12V) Characteristic Data
(See Note A)
Load Regulation, Vo1 vs Io1 with Io 2 =0.05A
4.0%
2.0%
2.0%
∆Vout (%)
∆Vout (%)
Load Regulation, Vo1 vs Io1 with Io 2 =0.2A
4.0%
0.0%
-2.0%
0.0%
-2.0%
-4.0%
-4.0%
0
0.2
0.4
0.6
0.8
1
1.2
0
0.1
0.2
Iout (A)
0.4
0.5
Cross Regulation, Vo1 vs Io2 with Io1 =0.05A
1.0%
0.5%
0.5%
∆Vout (%)
∆Vout (%)
Cross Regulation, Vo1 vs Io2 with Io1 =0.2A
0.0%
-0.5%
0.0%
-0.5%
-1.0%
-1.0%
0
0.2
0.4
0.6
0.8
1
1.2
0
0.1
0.2
Iout (A)
0.3
0.4
0.5
Iout (A)
Safe Operating Area Curves, Vin =38V–75V
(See Note C)
Safe Operating Area Curves, Vin =38V–75V
PT4311; Io1 =0 to 1.0A, Io2 =0.2A
(See Note C)
PT4313; Io 1 =0 to 0.25A, Io 2 =0.25A
90
90.0
80
80.0
70
Airflow
60
200LFM
120LFM
Nat conv
50
40
Ambient Temperature (°C)
Ambient Temperature (°C)
0.3
Iout (A)
1.0%
70.0
Airflow
60.0
60LFM
Nat conv
50.0
40.0
30.0
30
20.0
20
0
0.2
0.4
0.6
0.8
0.00
1
0.05
Io1 (A)
0.10
0.15
0.20
0.25
I1 out (A)
PT4311; Io1 =0 to 0.6A, Io2 =0.6A
PT4313; Io 1 =0 to 0.45A, Io 2 =0.05A
90
90.0
80
80.0
70
Airflow
60
200LFM
120LFM
Nat conv
50
40
Ambient Temperature (°C)
Ambient Temperature (°C)
(See Note A)
70.0
Airflow
200LFM
120LFM
60LFM
Nat conv
60.0
50.0
40.0
30.0
30
20.0
20
0
0.1
0.2
0.3
Io1 (A)
0.4
0.5
0.6
0.0
0.1
0.2
0.3
0.4
I1 out (A)
Note A: The above characteristic data has been developed from actual products tested at 25°C and Vin =53V. This data is considered typical data for the converter.
Note C: SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating temperatures.
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT4310 Series
Adjusting the Output Voltage of the PT4310
Series of Isolated DC/DC Converters
The PT4310 is a series of 6-watt isolated dual-output
DC/DC converters. The PT4310 series is functionally
similar and pin-compatible with the former PT4300 series,
but the adjustment of the output voltages is different 1.
The ±Vout output voltages of the PT4310 series may be
adjusted higher or lower than the factory trimmed value.
The adjustment method uses a single external resistor to
adjust the magnitude of both output voltages by as much
as ±5%. When adjusting the output voltages to a lower
value, an external bias voltage, referenced to the –Vin (primary), is also required. 2
Figure 1
+V IN
18
PT4310
(R3)
31.6kΩ
17
(R1)
Adj Down
(VR1), 5.1V
MM3Z5V1
–V IN
R2
Adjust Up
Adjust Down: An increase in the ±Vout output voltages is
obtained by adding a resistor, (R1), between Vo Adjust
(pin 12) and a +5VDC external voltage source. The voltage source must be referenced to –Vin (pin 17). A simple
external voltage source may be implemented by adding
the components (R3) and (VR1) in Figure 1.
Refer to Table 1 for the value of the external adjust resistors, R2, or (R1) required to adjust each model of the
PT4310 series, up or down respectively by the stated
percentage. See Figure 1 for the placement of (R1), R2,
and other components.
Table 1
DC/DC CONVERTER ADJUSTMENT RESISTOR VALUES
Series Pt #
PT4311
PT4313
Vo (nom)
±5.0V
±12.0V
(Io1 +Io2 )max 4
1.2A
0.5A
% Adjust
–5.0%
(90.9kΩ)
(0.0kΩ)
–2.5%
(750.0kΩ)
(511.0kΩ)
+2.5%
750.0kΩ
511.0kΩ
+5.0%
90.9kΩ
0.0kΩ
COM
-Vin
Remote
On/Off
11
±Vo
Adjust
12
–V OUT
R2 =Black
For technical support and more information, see inside back cover or visit www.ti.com
2
3
Notes
1. In most stand-alone applications the PT4310 series is a
direct substitute for the PT4300 series. However, the
method of output voltage adjustment differs between
the two series. For existing applications that use a
PT4300 part, a modification to the circuit will be
necessary if the output voltage is required to be
adjusted to a value other than the pre-trimmed factory
setting.
2. The adjustment control input, Vo Adjust (pin 12) is
referenced to –Vin (pin 17).
3. (R3) and (VR1) provide a +5VDC external bias voltage
that is required for (R1) to adjust the output voltages
down. If the outputs are to be adjusted up, only the R2
is required.
4. The PT4310 series is rated for 6 watts total output.
An increase in the output voltage will require a
corresponding reduction in the maximum allowed
total output current (Io1+Io2)max in Table 1. The
total current from both outputs must comply with
the following equation:Io1 + Io2
=
6
Va
Adc
or (Io1+Io2)max,
whichever is less.
0.0%
R1 = (Blue)
1
Note: (R3) and (VR1) are only
required with (R1), for adjusting
the output down.
Figure 1 gives a suggested schematic for the PT4310 output voltage adjustment. The components (R3) and (VR1)
are only required with (R1). 3
Adjust Up: Add a resistor, R2, between Vo Adjust (pin 12)
and –Vin (pin 17).
+V OUT
+Vin
Where,
Va = the new (adjusted) output voltage.
Application Notes continued
PT4310 Series
Using the Remote On/Off Function on the
PT4310 Isolated Dual Output DC/DC Converters
For applications requiring output voltage On/Off control,
the PT4310 DC/DC converter series incorporates a
“Remote On/Off” control (pin 11). This feature can be used
when there is a requirement for the module to be switched
off without removing the applied input source voltage.
Table 2; UVLO Thresholds 4
The converter operates normally with Pin 11 open-circuit,
and produces a regulated output voltage when a valid
source voltage is applied to +Vin (pin 18), with respect
to –Vin (pin 17). When a low-level 1 ground signal is
applied to pin 11, the converter output will be turned off.
Figure 1
Figure 1 shows an application schematic, which details
the typical use of the Remote On/Off function. Note the
discrete transistor (Q1). The control pin has its own
internal pull-up, and must be controlled with an opencollector or open-drain device (See notes 2 & 3). Table 1
gives the input requirements.
Series
Vin Range
UVLO Threshold
PT4310
38 – 75V
36V ±2V
+ V in
18
-V in
17
PT4310
-V o
Note 1
Vdd
R1
10k
D1
1N4148
#
U1a
#
Note 1
Min
Typ
-0.1V
5.0V 3
—
1.0V
—
Open-Circuit 2
Vo/c [Open-Circuit]
—
—
10V
Iin [pin 11 at –Vin]
—
–200µA
—
Enable
2
3
±Vo –V OUT
Adjust
12
Remote
On/Off
11
+ Vo
Q1
BSS138
1 =OFF
Table 1; Remote On/Off Control Requirements 1
Disable
COM
-Vin
Note 1
When placed in the “Off” state, the standby current drawn
from the input source is typically reduced to less than 1mA.
Parameter
1
+V OUT
+Vin
or similar low-leakage PIN diode
Max
Notes:
1. The Remote On/Off control uses –Vin (pin 17) as its
ground reference. All voltages specified are with respect
to –Vin.
2. Use an open-collector device (preferably a discrete
transistor) for the Remote On/Off input. Do not connect
a pull-up resistor directly to pin 11.
3. The Remote On/Off pin may be controlled with devices that
have a totem-pole output providing that a blocking
diode is used. The blocking diode is required to prevent
current from being injected into On/Off control pin.
Note: For TTL devices a pull-up may be required on the
cathode side of the blocking diode. This is to guarantee a
minimum enable voltage at pin 11 (See Figure 1).
Turn-On Time: In the circuit of Figure 1, turning Q1 on applies
a low-voltage to pin 11 and disables the converter output.
Correspondingly, turning Q1 off allows the converter to
power up and produce a regulated output voltage within
50ms. Although the rise-time of the output is short (<1ms),
the delay time will vary depending upon the input voltage
and the module’s internal timing. Figure 2 shows response
of the +5-V output from the PT4311 (±5.0V), following
the turn-off of Q 1 at time t =0. The waveform was
measured with a 48Vdc input voltage, and 0.25-Adc
resistive load at both the positive and negative outputs.
Figure 2
VO (2V/Div)
4. The PT4310 converters incorporate an “UnderVoltage Lockout” (UVLO). The UVLO will keep the
module off when the input voltage to the converter is
low, regardless of the state of the Remote On/Off
control. Table 2 gives the UVLO input voltage
thresholds.
delay time
0
5
10
15
20
25
30
time (milli-secs)
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