DELTA T48SR3R307PRFA

FEATURES
Š
Š
High efficiency : 86% @ 3.3V/7.5A
Size:
19.1mmx23.4mmx8.9mm (0.92”x0.75”x0.35”)
Š
Standard footprint
Š
Fixed frequency operation
Š
Hiccup output over current protection (OCP)
Š
Hiccup output over voltage protection (OVP)
Š
Auto recovery OTP
Š
Input UVLO
Š
Output voltage trim:-20%,+10%
Š
Pre-biased loads
Š
1500V isolation and basic insulation
Š
No minimum load required
Š
ISO 9001, TL 9000, ISO 14001, QS9000,
OHSAS18001 certified manufacturing facility
Š
Delphi Series T48SR, 1/32 Brick Family
DC/DC Power Modules:
36~75V in, 3.3V/7.5A out, 24.75W
UL/cUL 60950-1 (US & Canada) recognized
OPTIONS
Š
Latched over voltage protection
Š
Positive On/Off logic
The Delphi series T48SR3R307, 1/32 brick, 36V~75V input, single
output, isolated DC/DC converter is the latest offering from a world leader
in power system and technology and manufacturing ― Delta Electronics,
Inc. This product provides up to 24.75 watts of power in an industry
standard footprint and pin out. With creative design technology and
optimization of component placement, these converters possess
outstanding electrical and thermal performances, as well as extremely
high reliability under highly stressful operating conditions. The
T48SR3R307 offers more than 86% high efficiency at 7.5A full load.
DATASHEET
DS_T48SR3R307_10162012
APPLICATIONS
Š
Telecom / Datacom
Š
Wireless Networks
Š
Optical Network Equipment
Š
Server and Data Storage
Š
Industrial / Testing Equipment
TECHNICAL SPECIFICATIONS
(TA=25°C, airflow rate=300 LFM, Vin=48Vdc, nominal Vout unless otherwise noted;
PARAMETER
NOTES and CONDITIONS
T48SR3R307 (Standard)
Min.
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Continuous
Transient
Operating Temperature
Storage Temperature
Input/Output Isolation Voltage
INPUT CHARACTERISTICS
Operating Input Voltage
Input Under-Voltage Lockout
Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Lockout Hysteresis Voltage
Maximum Input Current
No-Load Input Current
Off Converter Input Current
2
Inrush Current (I t)
Input Reflected-Ripple Current
Input Voltage Ripple Rejection
OUTPUT CHARACTERISTICS
Output Voltage Set Point
Output Voltage Regulation
Over Load
Over Line
Over Temperature
Total Output Voltage Range
Output Voltage Ripple and Noise
Peak-to-Peak
RMS
Operating Output Current Range
Output DC Current-Limit Inception
DYNAMIC CHARACTERISTICS
Output Voltage Current Transient
Positive Step Change in Output Current
Negative Step Change in Output Current
Settling Time (within 1% Vout nominal)
Turn-On Transient
Start-Up Time, From On/Off Control
Start-Up Time, From Input
Maximum Output Capacitance
EFFICIENCY
100% Load
60% Load
ISOLATION CHARACTERISTICS
Input to Output
Isolation Resistance
Isolation Capacitance
FEATURE CHARACTERISTICS
Switching Frequency
ON/OFF Control, Negative Remote On/Off logic
Logic Low (Module On)
Logic High (Module Off)
ON/OFF Control, Positive Remote On/Off logic
Logic Low (Module Off)
Logic High (Module On)
ON/OFF Current (for both remote on/off logic)
Leakage Current (for both remote on/off logic)
Output Over-Voltage Protection
GENERAL SPECIFICATIONS
MTBF
Weight(open frame)
100ms
-40
-55
Output Voltage 10% Low
DS_ T48SR3R307_10162012
80
100
85
125
1500
Vdc
Vdc
°C
°C
Vdc
75
Vdc
32.5
30.5
1
34
32
2
35.5
33.5
5
1
Vdc
Vdc
Vdc
A
mA
mA
2
As
mA
dB
40
9
1
40
P-P thru 12µH inductor, 5Hz to 20MHz
120 Hz
Vin=48V, Io=Io,min to Io,max
Vin=36V to 75V, Io=Io max
Vin=48V, Tc=-40°C to 85°C
over sample load, line and temperature
5Hz to 20MHz bandwidth
Full Load, 400µF ceramic
Full Load, 400µF ceramic
Units
48
100% Load, 36Vin
Vin=48V, Io=0A
Vin=48V, Io=0A
Vin=48V, Io=0, Tc=25°C
Max.
36
-50
3.25
3.3
3.35
Vdc
±5
±5
±10
±10
±10
3.4
mV
mV
mV
Vdc
7.5
160
mV
mV
A
%
3.2
25
5
0
110
48V, 400µF Ceramic load cap, 1A/µs
50% Io.max to 75% Io.max
75% Io.max to 50% Io.max
115
115
130
Full load;
0
Vin=48V
Vin=48V
10
15
400
mV
mV
µs
30
30
5000
86
85
ms
ms
µF
%
%
1500
1300
Vdc
MΩ
pF
480
KHz
10
Von/off at Ion/off=1.0mA
Von/off at Ion/off=0.0 µA
0
2.4
0.8
5
V
V
Von/off at Ion/off=1.0mA
Von/off at Ion/off=0.0 µA
Ion/off at Von/off=0.0V
Logic High, Von/off=5V
0
2.4
0.8
5
1
120
140
V
V
mA
uA
%
Vin=48V; Io=80% of Io, max; Ta=25°C; 100LFM
Refer to Figure 24 for Hot spot location
(48Vin,80%Io, 200LFM,Airflow from Vin+ to Vin-)
Over-Temperature Shutdown (NTC Resistor)
Refer to Figure 24 for NTC resistor location
Note: Please attach thermocouple on NTC resistor to test OTP function, the hot spot’s temperature is just for reference.
Over-Temperature Shutdown (Hot Spot)
Typ.
5.3
8.2
M hours
grams
128
°C
125
°C
2
ELECTRICAL CHARACTERISTICS CURVES
90
85
4.000
POWER DISSIPATION(W)
EFFICIENCY(%)
80
75
36Vin
70
48Vin
65
60
72Vin
3.000
2.000
72Vin
55
50
0.75
36Vin
48Vin
1.000
1.5
2.25
3
3.75
4.5
5.25
6
6.75
7.5
0.75
1.5
2.25
3
3.75
4.5
5.25
6
6.75
7.5
OUTPUT CURRENT(A)
OUTPUT CURRENT(A)
Figure 1: Efficiency vs. load current for minimum, nominal, and
maximum input voltage.
Figure 2: Power dissipation vs. load current for minimum,
nominal, and maximum input voltage.
1
0.9
INPUT CURRENT (A)
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
30
35
40
45
50
55
60
65
70
75
INPUT VOLTAGE (V)
Figure 3: Typical full load input characteristics.
DS_ T48SR3R307_10162012
3
ELECTRICAL CHARACTERISTICS CURVES
For Negative Remote On/Off Logic
Figure 4: Turn-on transient at zero load current) (4ms/div).
Top Trace: Vout; 1.5V/div; Bottom Trace: ON/OFF input: 5V/div.
Figure 5: Turn-on transient at full rated load current (4 ms/div).
Top Trace: Vout: 1.5V/div; Bottom Trace: ON/OFF input: 5V/div.
For Input Voltage Start up
Figure 6: Turn-on transient at zero load current (10 ms/div).
Top Trace: Vout; 1.5V/div; Bottom Trace: input voltage: 30V/div.
DS_ T48SR3R307_10162012
Figure 7: Turn-on transient at full rated load current (10
ms/div). Top Trace: Vout; 1.5V/div; Bottom Trace: input voltage:
30V/div.
4
ELECTRICAL CHARACTERISTICS CURVES
Figure 8: Output voltage response to step-change in load
current (75%-50% of Io, max; di/dt =1A/µs). Load cap: 400µF,
ceramic capacitor. Top Trace: Vout (100mV/div,200us/div);
Bottom Trace: output current(1.5A/div, 200us/div)
Figure 9: Output voltage response to step-change in load
current (50%-75% of Io, max; di/dt =1A/µs). Load cap: 400µF
ceramic capacitor. Top Trace: Vout (100mV/div,200us/div);
Bottom Trace: output current(1.5A/div, 200us/div)
Figure 10: Test set-up diagram showing measurement points
for Input Terminal Ripple Current and Input Reflected Ripple
Current.
Note: Measured input reflected-ripple current with a simulated
source Inductance (LTEST) of 12 µH. Capacitor Cs offset
possible battery impedance. Measure current as shown above.
Figure 11: Top trace: Input Terminal Ripple Current, ic, at full
rated output current and nominal input voltage with 12µH
source impedance and 100µF electrolytic capacitor (2A/div,
2us/div), Setup is shown in Figure 10 top picture.
Bottom trace: Input Terminal Ripple Current, ic, at full rated
output current and nominal input voltage with 12µH source
impedance and 100µF electrolytic capacitor (2A/div,2us/div),
Setup is shown in Figure 10 bottom picture, there is one 1uH
inductor in front of module input side.
DS_ T48SR3R307_10162012
5
ELECTRICAL CHARACTERISTICS CURVES
Figure 12: Input reflected ripple current, is, through a 12µH
source inductor at nominal input voltage and rated load current
(25 mA/div,2us/div), Setup is shown in Figure 10 top picture.
Figure 13: Output voltage noise and ripple measurement test
setup.
Output Voltage (V)
4
3
2
1
0
0
1
2
3
4
5
6
7
8
9
10
Output Current (A)
Figure 14: Output voltage ripple at nominal input voltage and
rated load current (Io=7.5A)(10 mV/div, 2us/div)
Load capacitance: 400µF ceramic capacitor. Bandwidth: 20
MHz.
DS_ T48SR3R307_10162012
Figure 15: Output voltage vs. load current showing typical
current limit curves and converter shutdown points.
6
DESIGN CONSIDERATIONS
Input Source Impedance
The impedance of the input source connecting to the
DC/DC power modules will interact with the modules
and affect the stability. A low ac-impedance input source
is recommended. If the source inductance is more than
a few µH, we advise adding a 100µF electrolytic
capacitor mounted close to the input of the module to
improve the stability.
Module internal input filter is only one 1uF ceramic cap,
not L-C filter or Pi filter, so the external input cap ESR
loss need be paid more attention. A external inductor
(1uH) placed in front of module can decrease ESR loss
of the external input cap.
Figure 17: EMI test negative line @ T = +25°C and Vin = 48 V
Layout and EMC Considerations
Delta’s DC/DC power modules are designed to operate
in a wide variety of systems and applications. For design
assistance with EMC compliance and related PWB
layout issues, please contact Delta’s technical support
team. An external input filter module is available for
easier EMC compliance design. Below is the reference
design for an input filter tested with T48SR3R307XXXX
to meet EN55022 (VDE0878) class A(both q. peak and
average)
Schematic and Components List
Figure 18: EMI test positive line @ T = +25°C and Vin = 48 V
Safety Considerations
Figure 16 : Capacitive and inductive EMI Filter
C1=47uF /100 V(Low ESR)
C2=C3= 47 uF/100 V(Low ESR)
C4=C5=2200pF
T1=0.59mH type P0353 (Pulse)
Test Result:
At T = +25°C , Vin = 48 V and Io=7.5 A
Blue line is quasi peak mode; Green line is average
mode.
DS_ T48SR3R307_10162012
The power module must be installed in compliance with the
spacing and separation requirements of the end-user’s
safety agency standard, i.e., UL60950-1, CSA C22.2 NO.
60950-1 2nd and IEC 60950-1 2nd : 2005 and EN 60950-1
2nd: 2006+A11+A1: 2010, if the system in which the power
module is to be used must meet safety agency
requirements.
Basic insulation based on 75 Vdc input is provided between
the input and output of the module for the purpose of
applying insulation requirements when the input to this
DC-to-DC converter is identified as TNV-2 or SELV. An
additional evaluation is needed if the source is other than
TNV-2 or SELV.
When the input source is SELV circuit, the power module
meets SELV (safety extra-low voltage) requirements. If the
input source is a hazardous voltage which is greater than 60
Vdc and less than or equal to 75 Vdc, for the module’s output
to meet SELV requirements, all of the following must be met:
7
FEATURES DESCRIPTIONS
Š
The input source must be insulated from the ac
mains by reinforced or double insulation.
Š
The input terminals of the module are not operator
accessible.
Š
A SELV reliability test is conducted on the system
where the module is used, in combination with the
module, to ensure that under a single fault,
hazardous voltage does not appear at the module’s
output.
output terminals. If this voltage exceeds the
over-voltage set point, the modules will shut down, and
then restart after a hiccup-time (hiccup mode). If
customer needs a latch mode, please contact to Delta.
Over-Temperature Protection
When installed into a Class II equipment (without
grounding), spacing consideration should be given to
the end-use installation, as the spacing between the
module and mounting surface have not been evaluated.
The power module has extra-low voltage (ELV) outputs
when all inputs are ELV.
This power module is not internally fused. To achieve
optimum safety and system protection, an input line fuse
is highly recommended. The safety agencies require a
Fast-acting fuse with 20A maximum rating to be
installed in the ungrounded lead. A lower rated fuse can
be used based on the maximum inrush transient energy
and maximum input current.
Soldering and Cleaning Considerations
Post solder cleaning is usually the final board assembly
process before the board or system undergoes electrical
testing. Inadequate cleaning and/or drying may lower the
reliability of a power module and severely affect the
finished circuit board assembly test. Adequate cleaning
and/or drying is especially important for un-encapsulated
and/or open frame type power modules. For assistance
on appropriate soldering and cleaning procedures,
please contact Delta’s technical support team.
The over-temperature protection consists of circuitry
that provides protection from thermal damage. If the
temperature exceeds the over-temperature threshold
the module will shut down, and enter in auto-restart
mode.
For auto-restart mode, the module will detect
temperature after shutdown. If the over temperature
condition still exists, the module will remain shutdown.
This restart trial will continue until the over-temperature
condition is corrected.
Remote On/Off
The remote on/off feature on the module can be either
negative or positive logic. Negative logic turns the
module on during a logic low and off during a logic high.
Positive logic turns the modules on during a logic high
and off during a logic low.
Remote on/off can be controlled by an external switch
between the on/off terminal and the Vi (-) terminal. The
switch can be an open collector or open drain.
For negative logic if the remote on/off feature is not
used, please short the on/off pin to Vi (-). For positive
logic if the remote on/off feature is not used, please
leave the on/off pin to floating.
Vi(+)
Sense(+)
ON/OFF
Sense(-)
Over-Current Protection
The modules include an internal output over-current
protection circuit, which will endure current limiting for
an unlimited duration during output overload. If the
output current exceeds the OCP set point, the modules
will shut down (hiccup mode).
The modules will try to restart after shutdown. If the
overload condition still exists, the module will shut down
again. This restart trial will continue until the overload
condition is corrected.
Over-Voltage Protection
The modules include an internal output over-voltage
protection circuit, which monitors the voltage on the
DS_ T48SR3R307_10162012
Vo(+)
Vi(-)
Vo(-)
Figure 19: Remote on/off implementation
Remote Sense
Remote sense compensates for voltage drops on the
output by sensing the actual output voltage at the point
of load. The voltage between the remote sense pins
and the output terminals must not exceed the output
voltage sense range given here:
[Vo(+) – Vo(–)] – [SENSE(+) – SENSE(–)] ≤ 10% × Vout
8
FEATURES DESCRIPTIONS (CON.)
This limit includes any increase in voltage due to
remote sense compensation and output voltage set
point adjustment (trim).
If the external resistor is connected between the TRIM
and SENSE (-) pins, the output voltage set point
decreases (Fig.18). The external resistor value
required to obtain a percentage of output voltage
change △% is defined as:
Rtrim − down =
Vi(+) Vo(+)
Ex. When Trim-down -20 %( 3.3V×0.8=2.64V)
Sense(+)
Rtrim − down =
Sense(-)
Contact
Resistance
Vi(-)
511
− 10 .2(K Ω )
∆
511
− 10 .2 = 15 .4 (K Ω )
20
Vo(-)
Contact and Distribution
Losses
Figure 20: Effective circuit configuration for remote sense
operation
If the remote sense feature is not used to regulate the
output at the point of load, please connect SENSE(+) to
Vo(+) and SENSE(–) to Vo(–) at the module.
The output voltage can be increased by both the
remote sense and the trim; however, the maximum
increase is the larger of either the remote sense or the
trim, not the sum of both.
Figure 22: Circuit configuration for trim-up (increase output
voltage)
When using remote sense and trim, the output voltage
of the module is usually increased, which increases the
power output of the module with the same output
current.
If the external resistor is connected between the TRIM
and SENSE (+) the output voltage set point increases
(Fig. 19). The external resistor value required to obtain
a percentage output voltage change △% is defined
as:
Care should be taken to ensure that the maximum
output power does not exceed the maximum rated
power.
Rtrim_up
Output Voltage Adjustment (TRIM)
Ex. When Trim-up +10%(3.3V×1.1=3.63V)
To increase or decrease the output voltage set point,
the modules may be connected with an external
resistor between the TRIM pin and either the
SENSE(+) or SENSE(-). The TRIM pin should be left
open if this feature is not used.
Rtrim_up
 865.7 + 3.547  KΩ
 ∆

865.7
+ 3.547
10
90.117K Ω
The output voltage can be increased by both the remote
sense and the trim, however the maximum increase is
the larger of either the remote sense or the trim, not the
sum of both.
When using remote sense and trim, the output voltage
of the module is usually increased, which increases the
power output of the module with the same output
current.
Care should be taken to ensure that the maximum
output power of the module remains at or below the
maximum rated power.
Figure 21: Circuit configuration for trim-down (decrease
output voltage)
DS_ T48SR3R307_10162012
9
THERMAL CONSIDERATIONS
THERMAL CURVES
Thermal management is an important part of the system
design. To ensure proper, reliable operation, sufficient
cooling of the power module is needed over the entire
temperature range of the module. Convection cooling is
usually the dominant mode of heat transfer.
A IR FL OW
Hence, the choice of equipment to characterize the
thermal performance of the power module is a wind
tunnel.
Thermal Testing Setup
Delta’s DC/DC power modules are characterized in
heated vertical wind tunnels that simulate the thermal
environments encountered in most electronics
equipment. This type of equipment commonly uses
vertically mounted circuit cards in cabinet racks in which
the power modules are mounted.
H OT SPOT
NTC R E SISTOR
Figure 24: * Hot spot& NTC resistor temperature measured
points.
Outpu t Curren t (A)
8
The following figure shows the wind tunnel
characterization setup. The power module is mounted
on a test PWB and is vertically positioned within the
wind tunnel. The space between the neighboring PWB
and the top of the power module is constantly kept at
6.35mm (0.25’’).
T48SR3R307(Standard) Output Current vs. Ambient Temperat ure and Air Velocit y
@Vin = 48V (Either Orientation)
Natural
Convect ion
7
1 00 LF M
6
20 0L FM
5
4
3
PWB
FANCING PW B
MODU LE
2
1
0
25
30
35
40
45
50
55
60
65
70
75
80
85
A mbient T empe ratur e (℃)
Figure 25: Output current vs. ambient temperature and air
velocity @Vin=48V(Either orientation, without heat spreader)
50. 8(2. 00")
AIR VELOCITY
AND AMBIENT
TEMPERATURE
SURED BELOW
THE MODU LE
AIR FLOW
Note: Wind Tunnel Test Setup Figure D m
i ensions are in millimeters and (Inches)
Figure 23: Wind tunnel test setup
Thermal Derating
Heat can be removed by increasing airflow over the
module. To enhance system reliability, the power
module should always be operated below the maximum
operating temperature. If the temperature exceeds the
maximum module temperature, reliability of the unit may
be affected.
DS_ T48SR3R307_10162012
10
MECHANICAL DRAWING
Note: All pins are copper alloy with matte Tin over Ni plating .
DS_ T48SR3R307_10162012
11
PART NUMBERING SYSTEM
T
48
Form
Input
Factor
Voltage
Outputs
Series
48-36V~75V
S - Single
R- Series
T – 1/32
S
R
Number of Product
Brick
Number
3R3
07
N
N
Output
Output
ON/OFF
Pin
Voltage
Current
Logic
Length
3R3 –
07 – 7.5A
N - Negative
N - 0.146”
3.3V
P - Positive
F
A
Option Code
R - 0.170”
F - RoHS 6/6
A - Std. Functions
(Lead Free)
Space - RoHS5/6
MODEL LIST
MODEL NAME
INPUT
OUTPUT
EFF @ 100% LOAD
T48SR3R307NNFA
36V~75V
1A
3.3V
7.5A
86%
T48SR05005NNFA
36V~75V
1A
5V
5A
86%
Default remote on/off logic is negative and pin length is 0.170”
For different remote on/off logic and pin length, please refer to part numbering system above or contact your local sales
CONTACT: www.delta.com.tw/dcdc
USA:
Telephone:
East Coast: 978-656-3993
West Coast: 510-668-5100
Fax: (978) 656 3964
Email: DCDC@delta-corp.com
Europe:
Phone: +41 31 998 53 11
Fax: +41 31 998 53 53
Email: DCDC@delta-es.com
Asia & the rest of world:
Telephone: +886 3 4526107
ext 6220~6224
Fax: +886 3 4513485
Email: DCDC@delta.com.tw
WARRANTY
Delta offers a two (2) year limited warranty. Complete warranty information is listed on our web site or is available upon
request from Delta.
Information furnished by Delta is believed to be accurate and reliable. However, no responsibility is assumed by Delta for its
use, nor for any infringements of patents or other rights of third parties, which may result from its use. No license is granted
by implication or otherwise under any patent or patent rights of Delta. Delta reserves the right to revise these specifications
at any time, without notice.
DS_ T48SR3R307_10162012
12