FEATURES
High efficiency: 91.0% @ 5.0V/13A
Size: 33.0 x 22.9 x 9.5 mm
(1.3” x 0.90” x 0.37”)
Industry standard footprint and pinout
Fixed frequency operation
Input UVLO and OVP
OTP and output OCP, OVP
Output voltage trim: -20%, +10%
Monotonic startup into normal and
pre-biased loads
2250V isolation and basic insulation
No minimum load required
SMD and through-hole versions
No negative current during power or enable
on/off
ISO 9001, TL 9000, ISO 14001, QS 9000,
OHSAS 18001 certified manufacturing facilit
y
UL/cUL 60950 (US & Canada) recognized,
and TUV (EN60950) certified
CE mark meets 73/23/EEC and 93/68/EEC
directive
Delphi Series V48SR, 1/16th Brick 65W
DC/DC Power Modules: 48V in, 5.0V, 13A out
The Delphi Series V48SR, 1/16th Brick, 48V input, single output, isolated
DC/DC converter, is the latest offering from a world leader in powe
r
systems technology and manufacturing ― Delta Electronics, Inc. This
product family provides up to 66 watts of power or 25A of output curren
t
(1.8V and below) in an industry standard 1/16th brick form factor (1.30”
x
0.90”). The 5.0V output offers one of the highest output currents available
and provides up to 91.0% efficiency at full load. With creative design
technology and optimization of component placement, these converters
possess outstanding electrical and thermal performance, as well as
extremely high reliability under highly stressful operating conditions. All
modules are protected from abnormal input/output voltage, current, and
temperature conditions. For lower power needs with the 5.0V output, but
in a similar small form factor, please check out Delta S48SP (36W o
r
5V/7A) and S48SE (17W or 5V/3A) series standard DC/DC modules.
OPTIONS
SMD pins
Positive remote On/Off
OTP and output OVP, OCP mode
(Auto-restart or latch)
APPLICATIONS
Optical Transport
Data Networking
Communications
Servers
DATASHEET
DS_V48SR05013_02022007
DS_V48SR05013_02022007
2
TECHNICAL SPECIFICATIONS
(TA=25°C, airflow rate=300 LFM, Vin=48Vdc, nominal Vout unless otherwise noted.)
PARAMETER NOTES and CONDITIONS V48SR05013 (Standard)
Min. Typ. Max. Units
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Continuous 80 Vdc
Transient (100ms) 100ms 100 Vdc
Operating Temperature Refer to figure 21 for measuring point -40 124 °C
Storage Temperature -55 125 °C
Input/Output Isolation Voltage 2250 Vdc
INPUT CHARACTERISTICS
Operating Input Voltage 36 75 Vdc
Input Under-Voltage Lockout
Turn-On Voltage Threshold 32 34 35 Vdc
Turn-Off Voltage Threshold 30 32 33 Vdc
Lockout Hysteresis Voltage 1 2 3 Vdc
Maximum Input Current 100% Load, 36Vin 2.1 A
No-Load Input Current 50 mA
Off Converter Input Current 8 mA
Inrush Current (I2t) 1 A2s
Input Reflected-Ripple Current P-P thru 12µH inductor, 5Hz to 20MHz 20 mA
Input Voltage Ripple Rejection 120 Hz 60 dB
OUTPUT CHARACTERISTICS
Output Voltage Set Point Vin=48V, Io=Io.max, Tc=25°C 4.950 5.000 5.050 Vdc
Output Voltage Regulation
Over Load Io=Io, min to Io, max ±3 ±10 mV
Over Line Vin=36V to 75V ±3 ±10 mV
Over Temperature Tc=-40°C to 85°C ±50 mV
Total Output Voltage Range Over sample load, line and temperature 4.85 5.15 V
Output Voltage Ripple and Noise 5Hz to 20MHz bandwidth
Peak-to-Peak Full Load, 1µF ceramic, 10µF tantalum 60 100 mV
RMS Full Load, 1µF ceramic, 10µF tantalum 15 30 mV
Operating Output Current Range 0 13 A
Output Over Current Protection Output Voltage 10% Low 110 140 %
DYNAMIC CHARACTERISTICS
Output Voltage Current Transient 48V, 10µF Tan & 1µF Ceramic load cap, 0.1A/µs
Positive Step Change in Output Current 50% Io.max to 75% Io.max 125 mV
Negative Step Change in Output Current 75% Io.max to 50% Io.max 125 mV
Settling Time (within 1% Vout nominal) 200 us
Turn-On Transient
Start-Up Time, From On/Off Control 30 ms
Start-Up Time, From Input 30 ms
Maximum Output Capacitance Full load; 5% overshoot of Vout at startup 10000 µF
EFFICIENCY
100% Load 91.0 %
60% Load 91.5 %
ISOLATIO N CHARACTERISTICS
Input to Output 2250 Vdc
Isolation Resistance 10 MΩ
Isolation Capacitance 1100 pF
FEATURE CHARACTERISTICS
Switching Frequency 415 kHz
ON/OFF Control, Negative Remote On/Off logic
Logic Low (Module On) Von/off 0.7 V
Logic High (Module Off) Von/off 2 18 V
ON/OFF Control, Positive Remote On/Off logic
Logic Low (Module Off) Von/off 0.7 V
Logic High (Module On) Von/off 2 18 V
ON/OFF Current (for both remote on/off logic) Ion/off at Von/off=0.0V 1 mA
Leakage Current (for both remote on/off logic) Logic High, Von/off=15V 50 uA
Output Voltage Trim Range Pout ≦ max rated power -20 10 %
Output Voltage Remote Sense Range Pout ≦ max rated power 10 %
Output Over-Voltage Protection Over full temp range; % of nominal Vout 120 140 %
GENERAL SPECIFICATIONS
MTBF Io=80% of Io, max; Ta=25°C, airflow rate=300FLM 2.59 M hours
Weight 16 grams
Over-Temperature Shutdown Refer to figure 21 for measuring point 129 °C
DS_V48SR05013_02022007
3
ELECTRICAL CHARACTERISTICS CURVES
Figure 1: Efficiency vs. load current for minimum, nomi na l, and
maximum in put voltage at 25°C
Figure 2: Power dissipation vs. load current for minimum,
nominal, and max imum input voltage at 25°C.
Figure 3: Typical full load input characteristics at room
temperature
DS_V48SR05013_02022007
4
ELECTRICAL CHARACTERISTICS CURVES
For Negative Remote On/Off Logic
Figure 4: Turn-on transient at full rated load current (resistive
load) (5 ms/div). Vin=48V. Top Trace: Vout, 2.0V/div; Bottom
Trace: ON/OFF input,2V/div
Figure 5: Turn-on transient at zero load current (5 ms/div).
Vin=48V. Top Trace: Vout: 2.0V/div, Bottom Trace: ON/OFF
input, 2V/div
For Positive Remote On/Off Logic
Figure 6: Turn-on transient at full rated load current (resistive
load) (5 ms/div). Vin=48V. Top Trace: Vout, 2.0V/div; Bottom
Trace: ON/OFF input, 2V/div
Figure 7: Turn-on transient at zero load current (5 ms/div).
Vin=48V. Top Trace: Vout, 2.0V/div; Bottom Trace: ON/OFF
input, 2V/div
TBD
Figure 8: Output voltage response to step-change in load
current (75%-50%-75% of Io, max; di/dt = 0.1A/µs). Load cap:
10µF tantalum capacitor and 1µF ceramic capacitor. Top Trace:
Vout (100mV/div, 200us/div
)
, Bottom Trace: Iout (5A/div).
Scope measurement should be made using a BNC cable
(length shorter than 20 inches). Position the load between 51
mm to 76 mm (2 inches to 3 inches) from the module
Figure 9: Output voltage response to step-change in load
current (75%-50%-75% of Io, max; di/dt = 2.5A/µs). Load cap:
470µF, 35m
Ω
ESR solid electrolytic capacitor and 1µF ceramic
capacitor . Top Trace: V out (50mV/div, 200us/div
)
, Bottom Trace:
Iout (5A/div). Scope measurement should be made using a
BNC cable (length shorter than 20 inches). Position the load
between 51 mm to 76 mm (2 inches to 3 inches) from the
module
DS_V48SR05013_02022007
5
ELECTRICAL CHARACTERISTICS CURVES
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. Capa citor Cs offset possible
battery impedance. Measure current as show n below
Figure 11: Input Terminal Rip ple Current, ic, at full rated output
current and nominal input voltage with 12µH source impedance
and 33µF electrolytic capacitor (200 mA/div, 1us/div
Figure 12: Input reflected ripple current, is, through a 12µH
source inductor at nominal input voltage and rated l oad current
(20 mA/div, 1us/div)
Figure 13: Output voltage noise and ripple measurement test
setup
Figure 14: Output voltage ripple at nominal input voltage and
rated load current (Io=13A)(50 mV/div, 1us/div)
Load capacitance: 1µF ceramic capacitor and 10µF tantalum
capacitor . Bandwid th: 20 MHz. Scope measurements should be
made using a BNC cable (length shorter than 20 inches).
Position the load between 51 mm to 76 mm (2 inches to 3
inches) from the module
Figure 15: Output voltage vs. load current showing typical
current limit curves and converter shutdown points
StripCopper
Vo(-)
Vo(+)
10u 1u SCOPE RESISTIV
LOAD
0.0
1.0
2.0
3.0
4.0
5.0
6.0
0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0
LOAD CURRENT (A)
OUTPUT VOLTAGE ( V)
Vin=48V
DS_V48SR05013_02022007
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 10 to 100 µF electrolytic
capacitor (ESR < 0.7 Ω at 100 kHz) mounted close to the
input of the module to improve the stability.
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. Application notes to assist
designers in addressing these issues are pending
release.
Safety Considerations
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,
CAN/CSA-C22.2 No. 60950-00 and EN60950: 2000 and
IEC60950-1999, 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:
The input source must be insulated from the ac
mains by reinforced or double insulation.
The input terminals of the module are not operator
accessible.
If the metal baseplate is grounded, one Vi pin and
one Vo pin shall also be grounded.
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.
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
normal-blow fuse with 5A 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.
DS_V48SR05013_02022007
7
FEATURES DESCRIPTIONS
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
automatically shut down, and enter hiccup mode or latch
mode, which is optional.
For hiccup mode, the module will try to restart after
shutdown. If the over current condition still exists, the
module will shut down again. This restart trial will
continue until the over-current condition is corrected.
For latch mode, the module will latch off once it
shutdown. The latch is reset by either cycling the input
power or by toggling the on/off signal for one second.
Over-Voltage Protection
The modules include an internal output over-voltage
protection circuit, which monitors the voltage on the
output terminals. If this voltage exceeds the over-voltage
set point, the module will shut down, and enter in hiccup
mode or latch mode, which is optional.
For hiccup mode, the module will try to restart after
shutdown. If the over voltage condition still exists, the
module will shut down again. This restart trial will
continue until the over-voltage condition is corrected.
For latch mode, the module will latch off once it
shutdown. The latch is reset by either cycling the input
power or by toggling the on/off signal for one second.
Over-Temperature Protection
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 hiccup mode or latch
mode, which is optional.
For hiccup mode, the module will try to restart after
shutdown. If the over temperature condition still exists,
the module will shut down again. This restart trial will
continue until the over-temperature condition is
corrected.
For latch mode, the module will latch off once it
shutdown. The latch is reset by either cycling the input
power or by toggling the on/off signal for one second.
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 floating.
Vo(+)Vi(+)
Vo(-)
Sense(-)
Sense(+)
Vi(-)
ON/OFF
Figure 16: 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
This limit includes any increase in voltage due to
remote sense compensation and output voltage set
point adjustment (trim).
Vi(-)
Vi(+)
Vo(-)
Vo(+)
Sense(+)
Sense(-)
Resistance
Contact Contact and Distributio
n
Losses
Figure 17: 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.
DS_V48SR05013_02022007
8
Figure 19: Circuit configuration for trim-up (increase output
voltage)
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:
()
Ω−
∆
−
∆
∆+
=− KupRtrim 2.10
511
1.225 ) (100 Vo11.5
Ex. When Trim-up +10% (5V×1.1=5.5V)
()
Ω=−−
×
+
×
×
=− KupRtrim 1682.10
10
511
10225.1 )10100(511.5
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.
FEATURES DESCRIPTIONS (CON.)
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 does not exceed the maximum rated
power.
Output Voltage Adjustment (TRIM)
To increase or decrease the output voltage set point,
connect 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.
Figure 18: Circuit configuration for trim-down (decrease
output voltage)
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:
()
Ω
⎥
⎦
⎤
⎢
⎣
⎡−
∆
=− KdownRtrim 2.10
511
Ex. When Trim-down -10% (5V×0.9=4.5V)
() ()
Ω=Ω
⎥
⎦
⎤
⎢
⎣
⎡−=− KKdownRtrim 9.402.10
10
511
DS_V48SR05013_02022007
9
THERMAL CONSIDERATIONS
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.
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.
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’’).
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
12.7 (0.5”)
MODULE
A
IR FLO
W
50.8
(
2.0”
)
FACING PWB PWB
AIR VELOCIT
Y
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
Figure 20: 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.
THERMAL CURVES
Figure 21: Temperature measurement location
* The allowed maximum hot spot temperature is defin ed at 124
℃
.
V48SR05013(standard) Output Current vs. Ambient Temperature and Air Velocity
@Vin = 48V (Either Orientation)
0
4
8
12
65 70 75 80 85
Natural
Convection
100LFM
300LFM
200LFM
400LFM
Ambient Temperature (℃)
Output Current (A)
Figure 22: Output current vs. ambient temperature and air velocity
@Vin=48V (Either Orientation)
DS_V48SR05013_02022007
10
PICK AND PLACE LOCATION RECOMMENDED PAD LAYOUT (SMD)
SURFACE-MOUNT TAPE & REEL
DS_V48SR05013_02022007
11
LEADED (Sn/Pb) PROCESS RECOMMEND TEMP. PROFILE
Time ( sec. )
Pre-heat temp.
140~180°C 60~120 sec.
Peak temp.
210~230°C 5sec .
Ramp-up temp.
0.5~3.0°C /sec.
Temperature (°C )
50
100
150
200
250
300 60 0 120 180 240
2nd Ramp-up temp.
1.0~3.0°C /sec.
Over 200°C
40~50sec.
Cooling down rate <3°C /sec.
Note: The temperature refers to the pin of V48SR, measured on the pin +Vout joint.
LEAD FREE (SAC) PROCESS RECOMMEND TEMP. PROFILE
Temp.
Time
150℃
200℃
100~140 sec. Time Limited 90 sec.
above 217℃
217℃
Preheat time
Ramp up
max. 3℃/sec.
Ramp down
max. 4℃/sec.
Peak Tem
p
. 240 ~ 245
℃
25℃
Note: The temperature refers to the pin of V48SR, measured on the pin +Vout joint.
DS_V48SR05013_02022007
12
MECHANICAL DRAWING
Surface-mount module Through-hole module
Pin No. Name Function
1
2
3
4
5
6
7
8
+Vin
ON/OFF
-Vin
-Vout
-SENSE
TRIM
+SENSE
+Vout
Positive input voltage
Remote ON/OFF
Negative input voltage
Negative output voltage
Negative remote sense
Output voltage trim
Positive remote sense
Positive output voltage
DS_V48SR05013_02022007
13
PART NUMBERING SYSTEM
V 48 S R 050 13 N R F A
Type of
Product Input
Voltage Number of
Outputs Product
Series Output
Voltage Output
Current ON/OFF
Logic Pin
Length/Type Option Code
V - 1/16
brick
48V S - Single Regular 050 - 5V 13 - 13A N- Negative
P- Positive
R - 0.170”
N - 0.145”
K - 0.110”
M - SMD
F- RoHS 6/6
(Lead Free)
A - Standard Functions
MODEL LIST
MODEL NAME INPUT OUTPUT EFF @ 100% LOAD
V48SR1R225NRFA 36V~75V 1.2A 1.2V 25A 84.0%
V48SR1R525NRFA 36V~75V 1.4A 1.5V 25A 85.0%
V48SR1R825NRFA 36V~75V 1.6A 1.8V 25A 87.0%
V48SR2R520NRFA 36V~75V 1.8A 2.5V 20A 89.0%
V48SR3R320NRFA 36V~75V 2.4A 3.3V 20A 90.5%
V48SR05013NRFA 36V~75V 2.3A 5.0V 13A 91.0%
V48SR12005NRFA 36V~75V 2.3A 12V 5.5A 91.0%
V48SR15004NRFA 36V~75V 2.3A 15V 4.4A 91.0%
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 office.
CONTACT: www.delta.com.tw/dcdc
USA:
Telephone:
East Coast: (888) 335 8201
West Coast: (888) 335 8208
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
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.
