S48SR12001ERFA - Delta Electronics Inc.

Delphi Series S48SR, 15W 2”x1” Family

DC/DC Power Modules: 48V in, 5V/3A out

The Delphi Series S48SR printed circuit board mounted, 48V 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 family provides up to 15 watts o

power or up to 4.5A of output current (for 3.3V and below) in an

industry standard footprint. With creative design technology and

optimization of component placement, the Delphi Series Small Powe

converters possess outstanding electrical and thermal performance,

as well as extremely high reliability under highly stressful operating

conditions.

ll models are protected from abnormal input/outpu

voltage and current conditions. An encapsulated version is available

for the most robust performance in harsh environments.

FEATURES

 High efficiency: 86.5% @ 5V/3A

 Standard footprint: 2.0” ×1.0”

 Industry standard pin out

 Low profile

 Open Frame: 0.36”

 Encapsulated: 0.42”

 Fixed frequency operation

 Input UVLO, Output OCP, OVP

 No minimum load required

 2:1 input voltage range

 Operating case temperature:

-40°C to +100°C

 ISO 9000, TL 9000, ISO 14001 certified

manufacturing facility

 UL/cUL 60950 (US & Canada)

Recognized, and TUV (EN60950)

Certified

 CE mark meets 73/23/EEC and

93/68/EEC directives

OPTIONS

 Short pin lengths

APPLICATIONS

 Telecom/DataCom

 Wireless Networks

 Optical Network Equipment

 Server and Data Storage

 Industrial/Test Equipment

1Delta Electronics, Inc.

DATASHEET

DS_S48SR05003_07052006

TECHNICAL SPECIFICATIONS

(TA=25°C, airflow rate=300 LFM, Vin=48Vdc, nominal Vout unless otherwise noted.)

PARAMETER NOTES and CONDITIONS S48SR05003ERFA/B/C/D

Min. Typ. Max. Units

ABSOLUTE MAXIMUM RATINGS

Input Voltage

Continuous 80 Vdc

Transient (100ms) 100ms 100 Vdc

Operating Case Temperature -40 100 °C

Storage Temperature -55 125 °C

Input/Output Isolation Voltage 1 minute 1500 Vdc

INPUT CHARACTERISTICS

Operating Input Voltage 36 48 75 V

Input Under-Voltage Lockout

Turn-On Voltage Threshold 33.8 34.5 35.8 V

Turn-Off Voltage Threshold 32.0 33.5 34.5 V

Lockout Hysteresis Voltage 1 2 3 V

Maximum Input Current 100% Load, 36Vin 0.6 A

No-Load Input Current 25 mA

Inrush Current(I2t) 0.01 A2s

Input Reflected-Ripple Current P-P thru 12µH inductor, 5Hz to 20MHz 5 mA

Input Voltage Ripple Rejection 120 Hz 50 dB

OUTPUT CHARACTERISTICS

Output Voltage Set Point Vin=48V, Io=50% Io, max, Tc=25℃4.90 5.00 5.10 V

Output Voltage Regulation

Over Load Io=Io,min to Io,max ±10 ±25 mV

Over Line Vin=36V to 75V ±5 ±15 mV

Over Temperature Tc=-40 ℃to 100 ℃ 100 300

m/℃

Total Output Voltage Range Over sample load, line and temperature TBD TBD V

Output Voltage Ripple and Noise 5Hz to 20MHz bandwidth

Peak-to-Peak Full Load, 1µF ceramic, 10µF tantalum 50 100 mV

RMS Full Load, 1µF ceramic, 10µF tantalum 15 25 mV

Operating Output Current Range 0 3 A

Output DC Current-Limit Inception Output Voltage 10% Low 3.6 4.5 5.4 A

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 75 100 mV

Negative Step Change in Output Current 75% Io, max to 50% Io, max 75 100 mV

Setting Time to 1% of Final Value 600 µs

Turn-On Transient

Start-Up Time, From Input 35 50 ms

Maximum Output Capacitance Full load; 5% overshoot of Vout at startup 470 µF

EFFICIENCY

100% Load 84 86.5 %

ISOLATION CHARACTERIS TICS

Isolation Voltage 1500 V

Isolation Resistance 100 MΩ

Isolation Capacitance 500 pF

FEATURE CHARACTERISTICS

Switching Frequency 290 kHz

Output Voltage Trim Range Across Trim Pin & +Vo or -Vo, Pout≦max rated

owe

-10 +10 %

Output Over-Voltage Protection Over full temp range; % of nominal Vout 115 125 140 %

GENERAL SPECIFICATIONS

Calculated MTBF Io=80% of Io, max; Tc=40°C 3 M hours

Weight (Encapsulated) 25.5 grams

Weight (Open Frame) 12.5 grams

DS_S48SR05003_07052006

Figure 1: Efficiency vs. load current for minimum, nominal, and

maximum input voltage at 25°C Figure 2: Power dissipation vs. load current for minimum,

nominal, and maximum input voltage at 25°C

Figure 3: Typical input characteristics at room temperature Figure 4: Turn-on transient at full rated load current

(resistive load) (10 ms/div). Top Trace: Vin (20V/div);

Bottom Trace: Vout (1V/div).

ELECTRICAL CHARACTERISTICS CURVES

0.5 1 1.5 2 2.5 3

OUTPUT CURRENT (A)

EFFICIENCY (%)

36Vin 48Vin 75Vin

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

0.511.522.53

OUTPUT CURRENT(A)

POW ER DISSIPATION (W

)

36Vin 48Vin 75Vin

DS_S48SR05003_07052006

ELECTRICAL CHARACTERISTICS CURVES

Figure 5: Turn-on transient at zero load current (10 ms/div).

Top Trace: Vin (20V/div); Bottom Trace Vout (1V/div).

Figure 6: Output voltage response to step-change in load

current (50%-75%-50% of Io, max; di/dt = 0.1A/µs). Load

cap: 10µF, 100 m

Ω



ESR tantalum capacitor and 1µF

ceramic capacitor. Top Trace: Vout (50mV/div), Bottom

Trace: Iout (2A/div).

20﹫100KHz℃20 ℃100KHz﹫

Ω

ESR< 0.3 ESR< 0.3

TEST

12uH

Cs:68uF/100V 68uF/100V

Vi(-)

Vi(+)

Ω

Figure 7: Test set-up diagram showing measurement points

for Input Reflected Ripple Current (Figure 8).

Note: Measured input reflected-ri

ple current with a simulated

source Inductance (LTEST

)

of 12 µH. Capacitor Cs offset

possible battery impedance.

Figure 8:. Input Reflected Ripple Current, ic, at full rated

output current and nominal input voltage with 12µH source

impedance and 68µF electrolytic capacitor (2 mA/div).

DS_S48SR05003_07052006

ELECTRICAL CHARACTERISTICS CURVES

StripCopper

Vo(-)

Vo(+)

10u 1u SCOPE RESISTIV

LOAD

Figure 9: Output voltage noise and ripple measurement test

setup. 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 10: Output voltage ripple at nominal input voltage

and rated load current (50 mV/div). Load capacitance: 1µF

ceramic capacitor and 10µF tantalum capacitor. Bandwidth:

20 MHz.

0.0

1.0

2.0

3.0

4.0

5.0

6.0

0.01.02.03.04.05.06.0

LOAD CURRENT (A)

OU TPU T VOLTAGE (V)

Vin= 48V

Figure 11: Output voltage vs. load current showing typical

current limit curves and converter shutdown points.

DS_S48SR05003_07052006

THERMAL CURVES: ENCAPSULATED VERSION

Top View

S48SR05003ER A, B Output Current vs. Ambient Temperature and Air Velocity @Vin < 60V

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

2.2

2.4

2.6

2.8

3.0

3.2

65 70 75 80 85 90 95 100

Ambient Temperature (℃)

Output Current(A)

400LFM

100LFM

Natural

Convection

200LFM

300LFM

500LFM

600LFM

Figure 12: Hot spot location.

Pin locations are for reference only. Figure 13: Output current vs. ambient temperature and air

velocity (Vin<60V)

S48SR05003ER A, B Output Current vs. Ambient Temperature and Air Velocity @Vin = 75V

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

2.2

2.4

2.6

2.8

3.0

3.2

55 60 65 70 75 80 85 90 95

Ambient Temperature (℃)

Output Current(A)

100LFM

200LFM

300LFM

400LFM

500LFM

600LFM

Natural

Convection

S48SR05003ER A, B Power Dissipation vs. Ambient Temperature and Air Velocity

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

2.2

2.4

2.6

2.8

3.0

3.2

55 60 65 70 75 80 85 90 95 100 105

Ambient Temperature (℃)

Power Dissipation (Watts)

100LFM

200LFM

300LFM

400LFM

500LFM

600LFM

Natural

Convection

Figure 14: Output current vs. ambient temperature and air

velocity (Vin=75V) Figure 15: Power dissipation vs. ambient temperature and air

velocity

DS_S48SR05003_07052006

THERMAL CURVES: OPEN FRAME VERSION

S48SR05003ER C, D Output Current vs. Ambient Temperature and Air Velocity @Vin < 60V

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

2.2

2.4

2.6

2.8

3.0

60 65 70 75 80 85 90 95 100

Ambient Temperature (℃)

Output Current(A)

600LFM

500LFM

400LF

200LFM

100LFM

Natural

Convection

300LFM

S48SR05003ER C, D Output Current vs. Ambient Temperature and Air Velocity @Vin = 75V

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

2.2

2.4

2.6

2.8

3.0

50 55 60 65 70 75 80 85 90 95

Ambient Temperature (℃)

Output Current(A)

100LFM

300LFM

200LFM

400LFM

500LFM

600LFM

Natural

Convection

Figure 18: Output current vs. ambient temperature and air

velocity (Vin=75V) Figure 19: Power dissipation vs. ambient temperature and air

velocity

S48SR05003ER C, D Power Dissipation vs. Ambient Temperature and Air Velocity

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

2.2

2.4

2.6

2.8

50 55 60 65 70 75 80 85 90 95 100 105

Ambient Temperature (℃)

Power Dissipation (Watts)

100LFM

200LFM

300LFM

400LFM

500LFM

600LFM

Natural

Convection

Figure 16: Case temperature measurement location.

Pin locations are for reference only.

Figure 17: Output current vs. ambient temperature and air

velocity (Vin<60V)

DS_S48SR05003_07052006

Do not ground one of the input pins without grounding

one of the output pins. This connection may allow a

non-SELV voltage to appear between the output pin

and ground.

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 1A 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 powe

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.

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 inpu

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 if the system in

which the power module is to be used must mee

safety agency requirements.

When the input source is 60Vdc or below, the powe

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 o

equal to 75 Vdc, for the module’s output to mee

SELV requirements, all of the following must be met:

 The input source must be insulated from an

hazardous voltages, including the ac mains, with

reinforced insulation.

 One Vi pin and one Vo pin are grounded, or all

the input and output pins are kept floating.

 The input terminals of the module are not operato

accessible.



SELV reliability test is conducted on the system

where the module is used to ensure that under a

single fault, hazardous voltage does not appear a

the module’s output.

DS_S48SR05003_07052006

EX. When Trim-down –10%(5V×0.9=4.5V)

[]

ΚΩ=−

+×

×−

=96.5249.6

016.01.05 1.005.47381.35

down-Rtrim

Vo(+)

Vo(-)

Trim

Rtrim-up

Figure 21: Circuit configuration for trim-up (increase

output voltage)

If the external resistor is connected between the TRIM

and Vo- the output voltage set point increases. The

external resistor value required to obtain a percentage

output voltage change △Vo% is defined as:

[]

ΚΩ−

−∆

=49.6

016.0Vo5 668.11

up-Rtrim

Ex. When Trim-up +10%(5V×1.1=5.5V)

[]

Ω..

.-.

.Κ=−

=6217496

0160105 66811

up-Rtrim

Care should be taken to ensure that the maximum

output power of the module remains at or below the

maximum rated power.

FEATURES DESCRIPTIONS

Over-Current Protection

The modules include an internal output over-curren

protection circuit, which will endure current limiting fo

an unlimited duration during output overload. If the

output current exceeds the OCP set point, the

modules will automatically shut down (hiccup mode).

The modules will try to restart after shutdown. If the

overload condition still exists, the module will shu

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

output terminals. If this voltage exceeds the over-

voltage set point, the module will shut down and latch

off. The over-voltage latch is reset by cycling the inpu

power.

Output Voltage Adjustment (TRIM)

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 Vo+ o

Vo-. The TRIM pin should be left open if this feature is

not used.

Vo(+)

Vo(-)

Trim trim-down

Figure 20: Circuit configuration for trim-down (decrease

output voltage)

If the external resistor is connected between the

TRIM and Vo+ pins, the output voltage set point

decreases. The external resistor value required to

obtain a percentage of output voltage change △

Vo% is defined as:

[]

ΚΩ−

+∆

∆−

=49.6

016.0Vo5 Vo05.47381.35

down-Rtrim

DS_S48SR05003_07052006

Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inch

10 (0.4”)

MODULE

IR FLO

50.8

(

2.0”

)

FACING PWB PWB

AIR VELOCIT

AND AMBIENT

TEMPERATURE

MEASURED BELOW

THE MODULE

Figure 22: Wind Tunnel Test Setup

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 ove

the entire temperature range of the module.

Convection cooling is usually the dominant mode o

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 6.35mm

(0.25”).

Thermal Derating

Heat can be removed by increasing airflow over the

module. Figure 13, 14, 17, and 18 show maximum

output is a function of ambient temperature and

airflow rate. The module’s maximum case

temperature is +100°C. To enhance system reliability,

the power module should always be operated belo

the maximum operating temperature. If the

temperature exceeds the maximum module

temperature, reliability of the unit may be affected.

DS_S48SR05003_07052006

MECHANICAL DRAWING

Open Frame Version Encapsulated Version

Pin No. Name Function

1 +Vin Positive input voltage

2 -Vin Negative input voltage

3 +Vout Positive output voltage

4 TRIM Output voltage trim

5 -Vout Negative output voltage

DS_S48SR05003_07052006

PART NUMBERING SYSTEM

S 48 S R 050 03 E R F A

Form Factor Input

Voltage Number of

Outputs Product

Series Output

Voltage Output

Current ON/OFF Logi

Length Option Code

S- Small Power 48V S- Single R- Thru-hole 050-5.0V 03- 3A E-No ON/OFF

Control

Function

R- 0.170”

N- 0.145”

K- 0.110”

F- RoHS 6/6

(Lead Free)

A- Encapsulated &

Trim

B- Encapsulated &

No Trim

C- Open Frame &

Trim

D- Open Frame &

No Trim

MODEL LIST

MODEL NAME INPUT OUTPUT EFF @ 100% LOAD

S48SR1R805ERFA 36V~75V 0.5A 1.8V 5.0A 80.0%

S48SR2R504ERFA 36V~75V 0.5A 2.5V 4.5A 83.0%

S48SR3R303ERFA 36V~75V 0.5A 3.3V 3.0A 84.5%

S48SR3R304ERFA 36V~75V 0.6A 3.3V 4.5A 86.0%

S48SR05002ERFA 36V~75V 0.5A 5.0V 2.0A 85.0%

S48SR05003ERFA 36V~75V 0.6A 5.0V 3.0A 86.5%

S48SR12001ERFA 36V~75V 0.6A 12.0V 1.25A 86.5%

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.