Delta S48SR User Manual

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Delphi Series S48SR, 15W 2”x1” Family
DC/DC Power Modules: 48 V in, 12V/1.25A out

The Delphi Series S48SR printed circuit board mounted, 48V input,

single output, isolated DC/DC converter is latest offering from a world

leader in power system and technology and manufacturing ― Delta

Electronics, Inc. This product family provides up to 15 watts of powe

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

standard footprint. With creative design technology and optimization

of component placement, the Delphi Series Small Power 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/output voltage and

current conditions. An encapsulated version is available for the mos
robust performance in harsh environments.

FEATURES

 High efficiency: 86.5% @ 12V/1.25A

 Standard footprint: 2.0” ×1.0”

 Industry standard pin out

 Low profile

 Open Frame: 9.1mm (0.36”)

 Encapsulated: 10.7mm (0.42”)

 Fixed frequency operation

 Input UVLO, Output OCP, OVP

 No minimum load required

 2:1 input voltage range

 ISO 9001, TL 9000, ISO 14001, QS

9000, OHSAS 18001 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

DATASHEET
DS_S48SR12001_07052006

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Delta Electronics, Inc.

TECHNICAL SPECIFICATIONS

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

PARAMETER NOTES and CONDITIONS S48SR12001ERFA//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℃ 11.76 12.00 12.24
Output Voltage Regulation

Over Load Io=Io,min to Io,max ±12 ±60 mV
Over Line Vin=36V to 75V ±12 ±36 mV
Over Temperature Tc=-40C to 100C 100 300 ppm/℃

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 1.25 A
Output DC Current-Limit Inception Output Voltage 10% Low 1.5 2 2.5 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 100 240 mV

Negative Step Change in Output Current 75% Io, max to 50% Io, max 100 240 mV

Setting Time to 1% of Final Value 600 µs
Turn-On Transient

Start-Up Time, From Input 35 50

Maximum Output Capacitance Full load; 5% overshoot of Vout at startup 47 µF

EFFICIENCY

100% Load

ISOLATION CHARACTERISTICS

Isolation Voltage 1500 V
Isolation Resistance 100 MΩ
Isolation Capacitance 500 pF

FEATURE CHARACTERISTICS

Switching Frequency 290 kHz
Output Voltage Trim Range
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

84 86.5 %

Across Trim Pin & +Vo or -Vo, Pout≦max rated power -10 +10 %

V

ms

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ELECTRICAL CHARACTERISTICS CURVES

)

90

36Vin 48Vin 75Vi n

85

EFFICIENCY (%)

POWER DISSIPATION (W

80

75

4.0

3.5

3.0

2.5

2.0

1.5

36Vin

48Vin 75Vin

70

65

60

0.25 0.5 0.75 1 1.25

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

and maximum input voltage at 25

°C

1.0

0.5

0.0

0.25 0.5 0.75 1 1.25

OUTPUT CURRENT (A)

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

DS_S48SR12001_07052006

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

Trace Vout (5V/div).

3

ELECTRICAL CHARACTERISTICS CURVES

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

Top Trace: Vin (20V/div) Bottom Trace Vout (5V/div).

i

s

TEST

12uH

Cs:68uF/100V 68uF/100V
ESR< 0.3 ESR< 0.3

Figure 7: Test set-up diagram showing measurement points

for Input Reflected Ripple Current. (Figure 8).
Note: Measured input reflected-ripple current with a simulated
source Inductance (L
possible battery impedance.

Ω

) of 12 µH. Capacitor Cs offset

TEST

Ω

20﹫100KHz℃20 ℃100KHz﹫

Vi(+)

Vi(-)

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
ceramic capacitor. Top Trace: Vout (50mV/div), Bottom
Trace: Iout (0.5A/div).

Figure 8: Input Reflected Ripple Current, i

output current and nominal input voltage with 12

impedance and 68

Ω

ESR tantalum capacitor and 1µF

, at full rated

s

µF electrolytic capacitor (2 mA/div).

µH source

DS_S48SR12001_07052006

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ELECTRICAL CHARACTERISTICS CURVES

E

StripCopper

Vo(+)

SCOPE RESISTIV

10u

Vo(-)

1u

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.

14.0

12.0

10.0

OUT PUT VOLTAGE ( V)

8.0

6.0

4.0

2.0

0.0

0.0 0.5 1.0 1.5 2.0 2.5

Figure 11: Output voltage vs. load current showing typical
current limit curves and converter shutdown points.

Vin=48V

LOAD CURRENT (A)

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.

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THERMAL CURVES: ENCAPSULATED VERSION

S48SR12001ER A, B Output Current vs. Ambient Temperature and Air Velocity@Vin < 60V

Output Current(A)

1.3

1.2

1.1

1.0

0.9

0.8

0.7

0.6

0.5

0.4

Top View

0.3

0.2

0.1

0.0
65 70 75 80 85 90 95 100

Natural

Convection

100LFM

200LFM

600LFM

500LFM

400LFM

300LFM

Ambient Temperature (℃)

Figure 12: Case temperature measurement location.

Pin locations are for reference only.

S48SR12001ER A, B Power Dissipation vs. Ambient Temperature and Air Velocity

Power Dissipation (Watts)

3.3

3.0

2.7

2.4

2.1

1.8

1.5

1.2

0.9

0.6

0.3

0.0
55 60 65 70 75 80 85 90 95 100 105

Natural

Convection

100LFM

200LFM

300LFM

600LFM

500LFM

400LFM

Ambient Temperature (℃)

Figure 14: Power dissipation vs. ambient temperature and air

velocity

Figure 13: Output current vs. ambient temperature and air

velocity (Vin<60V)

DS_S48SR12001_07052006

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THERMAL CURVES: OPEN FRAME VERSION

Output Current(A)

Top View

1.3

1.2

1.1

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0.0
60 65 70 75 80 85 90 95 100

S48SR12001ER C, D Output Current vs. Ambient Temperature and Air Velocity @Vin < 60V

600LFM

Natural

Convection

100LFM

200LFM

300LFM

500LFM

400LFM

Ambient Temperature (℃)

Figure 15: Case temperature measurement location.

Pin locations are for reference only.

S48SR12001ER C, D Power Dissipation vs. Ambient Temperature and Air Velocity

Power Dissipation (Watts)

3.2

3.0

2.8

2.6

2.4

2.2

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0.0
45 50 55 60 65 70 75 80 85 90 95 100 105

Natural

Convection

100LFM

200LFM

300LFM

600LFM

500LFM

400LFM

Ambient Temperature (℃)

Figure 17: Power dissipation vs. ambient temperature and air

velocity

Figure 16: Output current vs. ambient temperature and air
velocity (Vin<60V)

DS_S48SR12001_07052006

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DESIGN CONSIDERATIONS

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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.

pplication 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.

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 ratd fuse
can be used based on the maximum inrush transien

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.

DS_S48SR12001_07052006

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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 (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
output terminals. If this voltage exceeds the over­voltage set point, the module will shut down and latch
off. The over-voltage latch is reset by cycling the input
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+ or Vo -. The
TRIM pin should be left open if this feature is not used.

Vo(+)

R

Trim

trim-down

Ex. When Trim-down –10% (12V X 0.9 = 10.8V)

1.04.248732.222

downRtrim

=− 50.15232.3

Vo(+)

Trim

Vo(-)

Figure 19: 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:

×−

07.01.012

+×

R

trim-up

[]

ΚΩ=−

upRtrim

=− 32.3

668.25

−∆

07.0Vo12

[]

ΚΩ−

Ex. When Trim-up +10% (12V X 1.1 = 13.2V)

upRtrim

=− 39.1932.3

668.25

−×

07.01.012

[]

ΚΩ=−

Care should be taken to ensure that the maximum
output power of the module remains at or below the
maximum rated power.

Vo(-)

Figure 18: 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:

downRtrim

=− 32.3

DS_S48SR12001_07052006

Vo4.248732.222

∆−

07.0Vo12

+∆

[]

ΚΩ−

9

A

)

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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
or a heat sink 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 below the maximum operating
temperature. If the temperature exceeds the
maximum module temperature, reliability of the unit
may be affected

.

TEMPERATURE

MEASURED BELOW

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

Figure 20: Wind tunnel test setup

FACING PWB

AIR VELOCIT
AND AMBIENT

THE MODULE

PWB

MODULE

50.8 (2.0”

IR FLOW

10 (0.4”)

DS_S48SR12001_07052006

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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_S48SR12001_07052006

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PART NUMBERING SYSTEM

S 48 S R 120 01 E R F A

Form Factor Input

Voltage

S- Small

Power

48V S- Single R- Thru-hole 120-12V 01-1.25A E-No ON/OFF

Number of

Outputs

Product

Series

Output

Voltage

Output

Current

ON/OFF

Logic

Control

Function

Pin

Length

R- 0.170”
N- 0.145”
K- 0.110”

Option Code

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

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:

USA:

Telephone:
East Coast: [phone]
West Coast: [phone]
Fax: [phone]
Email:

www.delta.com.tw/dcdc

[e-mail]

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.

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

Europe:

Phone: [phone]
Fax: [phone]

Email:

[e-mail]

Asia & the rest of world:

Telephone: [phone] ext 6220
Fax: [phone]

[e-mail]

Email:

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