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

DS_S48SR12001_07052006

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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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