Delta Electronics S48SA User Manual

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FEATURES

 High efficiency: 90.5% @ 5V/ 6.6A

 Size: 47.2mm x 29.5mm x 8.35mm

(1.86" x 1.16" x 0.33")

 Low profile: 0.33"

 Industry standard footprint and pin out

 Surface mountable

 Fixed frequency operation

 Input UVLO, Output OCP, OVP

 No minimum load required

 2:1 input voltage range

 Basic insulation

 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

directive

Delphi Series S48SA, 33W Family
DC/DC Power Modules: 48V in, 5V/6.6A out

The Delphi Series S48SA, surface mountable, 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 33 watts of powe

or up to 12A of output current (for output voltage 1.8V or under). With

creative design technology and optimization of componen

placement, these converters possess outstanding electrical and

thermal performance, as well as extremely high reliability unde

highly stressful operating conditions. All models are protected from

abnormal input/output voltage and current conditions.

OPTIONS

 Positive on/off logic

 Through hole pin

APPLICATIONS

 Telecom/DataCom

 Wireless Networks

 Optical Network Equipment
 Server and Data Storage

 Industrial/Test Equipment

DATASHEET
DS_S48SA05006_06022006

Delta Electronics, Inc.

TECHNICAL SPECIFICATIONS

A

pp

A

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

PARAMETER

ABSOLUTE MAXIMUM RATINGS

Input Voltage

Continuous
Transient (100ms) 100ms 100 Vdc

Operating Temperature Refer to Figure 18 for measuring point -40 115 °C
Storage Temperature
Input/Output Isolation Voltage 1 minute 1500 Vdc

INPUT CHARACTERISTICS

Operating Input Voltage
Input Under-Voltage Lockout

Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Lockout Hysteresis Voltage

Maximum Input Current 100% Load, 36Vin 1.3 A
No-Load Input Current 40 mA
Off Converter Input Current 7
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
Output Voltage Regulation

Over Load Io=Io,min to Io,max ±2 ±10 mV
Over Line Vin=36V to75V ±2 ±5 mV

Over Temperature
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 30 75 mV

RMS Full Load, 1µF ceramic, 10µF tantalum 8 20 mV
Operating Output Current Range 0 6.6 A
Output DC Current-Limit Inception Output Voltage 10% Low 7.26 8.5 9.9 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 50 100 mV

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

Settling Time to 1% of Final value 200 µs
Turn-On Transient

Start-Up Time, From On/Off Control 6 12 ms

Start-Up Time, From Input 6 12

Maximum Output Capacitance Full load; 5% overshoot of Vout at startup 2200 µF

EFFICIENCY

100% Load

ISOLATION CHARACTERISTICS

Isolation Voltage 1500 V
Isolation Resistance 10 MΩ
Isolation Capacitance 1500 pF

FEATURE CHARACTERISTICS

Switching Frequency 330 kHz
ON/OFF Control, (Logic Low-Module ON)

Logic Low Von/off at Ion/off=1.0mA 0 0.8 V

Logic High Von/off at Ion/off=0.0 µA 15 V

ON/OFF Current Ion/off at Von/off=0.0V 1 mA

Leakage Current
Output Voltage Trim Range
Output Over-Voltage Protection(Hiccup) Over full temp range; % of nominal Vout 115 125 140 %

GENERAL SPECIFICATIONS

MTBF Io=80% of Io, max; Tc=40°C 4.81 M hrs
Weight 18 grams
Over-Temperature Shutdown Refer to Figure 18 for measuring point 115 °C

NOTES and CONDITIONS S48SA05006NRFA

Min. Typ. Max. Units

Vin=48V, Io=50%Io.max, Ta=25℃

Ta=-40℃ to 85℃

88.5 90.5 %

Logic High, Von/off=15V 50 uA

cross Trim Pin & +Vo or –Vo, Pout≦max rated

80 Vdc

-55 125 °C

36 48 75 V

32.5 34 35.5 V

30.5 32 33.5 V

1 2 3 V

4.92 5 5.08

100 300

-10 +10 %

m

m/℃

ms

V

DS_S48SA05006_06022006

2

ELECTRICAL CHARACTERISTICS CURVES

95

90

EFFICIENCY (%)

85

4.0

3.5

3.0

2.5

POWER DISSIPATION (W)

80

75

36Vin

70

65

1234566

48Vin

75Vin

OUT PUT CURRENT (A)

.6

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

maximum input voltage at 25

1.2

1.0

INPUT CURRENT (A )

0.8

0.6

0.4

°C.

Io=6.6A

Io=3.96A

Io=0.66A

2.0

1.5

1.0

0.5

0.0

123456

36Vin

48Vin

75Vin

6.6

OUTPUT CURRENT (A)

Figure 2: Power dissipation vs. load current for minimum,

nominal, and maximum input voltage at 25

°C.

0.2

0.0
30 35 40 45 50 55 60 65 70 75

INPUT VOLT AGE (V)

Figure 3: Typical input characteristics at room temperature. Figure 4: Turn-on transient at full rated load current (2 ms/div).

Top Trace: Vout (2V/div); Bottom Trace: ON/OFF Control
(5V/div).

3

DS_S48SA05006_06022006

ELECTRICAL CHARACTERISTICS CURVES



)

Figure5: Turn-on transient at zero load current (2 ms/div). Top

Trace: Vout (2V/div); Bottom Trace: ON/OFF Control (5V/div).

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

current (50%-75% 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).

Figure 7: Output voltage response to step-change in load

current (75%-50% of Io, max; di/dt = 0.1A/µs). Load cap:
10µF, 100 m
capacitor. Top Trace: Vout (50mV/div), Bottom Trace: Iout
2A/div).

Ω

ESR tantalum capacitor and 1µF ceramic

DS_S48SA05006_06022006

Figure 8: Test set-up diagram showing measurement points

for Input Reflected Ripple Current (Figure 9).
Note: Measured input reflected-ripple current with a simulated

source Inductance (L
possible battery impedance.

of 12 µH. Capacitor Cs offset

TEST

4

ELECTRICAL CHARACTERISTICS CURVES

E

StripCopper

Vo(+)

Figure 9: Input Reflected Ripple Current, i
current and nominal input voltage with 12

µF electrolytic capacitor (2 mA/div).

and 33

, at full rated output

s

µH source impedance

10u

Vo(-)

SCOPE RESISTIV

1u

LOAD

Figure 10: 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.

6.0

5.0

OUTPUT VOLTAGE (V)

4.0

3.0

Figure 11: Output voltage ripple at nominal input voltage and
rated load current (20 mV/div). Load capacitance: 1

capacitor and 10

µF tantalum capacitor. Bandwidth: 20 MHz.

µF ceramic

2.0

1.0

0.0

0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0

Figure 12: Output voltage vs. load current showing typical
current limit curves and converter shutdown points.

Vin=48V

LOA D CURRENT (A)

5 5

DS_S48SA05006_06022006

DESIGN CONSIDERATION

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 end­user’s safety agency standard if the system in which the
power module is to be used must meet safety agency
requirements.

When the input source is 60Vdc or below, 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 any

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 operator

accessible.

 A 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 at
the module’s output.

Do not ground one of the input pins without grounding
one of the output pins. This connection may allow a non­SELV 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 3A 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_S48SA05006_06022006

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n

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 (Hiccup
mode). The modules will try to restart after shutdown. If
the fault condition still exists, the module will shut down
again. This restart trial will continue until the fault
condition is corrected.

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.

The module will try to restart after shutdown. If the over­temperature condition still exists during restart, the
module will shut down again. This restart trial will
continue until the temperature is within specification.

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.

Vo(+)Vi(+)

Sense(+)

ON/OFF

Sense(-)

Vi(-)

Vo(-)

Figure 13: Remote on/off implementation

Remote Sense (Optional)

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(+)

Vo(+)

Sense(+)

Sense(-)

Vi(-)

Contact

Resistance

Vo(-)

Contact and Distributio

Losses

Figure 14: 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.

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.

7

DS_S48SA05006_06022006

∆

+

−

+

utput Voltage Adjustment (TRIM)

O

o increase or decrease the output voltage set point, the

T
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.

Figure 15: Circuit configuration for trim-down (decrease output

voltage)

the external resistor is connected between the TRIM

If
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:

Rtrim

down

1690

∆

%Vo

[]

−=−

1.73

ΚΩ

x. When trim-down –10% (5V X 0.9 = 4.5V)

E

Rtrim

down

1690

10

=−=−

9.951.73

[]

ΚΩ

Rtrim

=− 1.73

up

∆

1690%)100(69 Vo

%Vo

[]

ΚΩ−

−

x. When trim-up +10% (5V X 1.1 = 5.5V)

E

=− 9.5161.73

Rtrim

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

up

1690)10100(69

10

[]

ΚΩ=−

Figure 16: Circuit configuration for trim-up (increase output
voltage)

the external resistor is connected between the TRIM

If
and Vo+the output voltage set point increases. The
external resistor value required to obtain a percentage
output voltage change △Vo% is defined as:

DS_S48SA05006_06022006

8

THERMAL CONSIDERATIONS

A

Y

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. The module’s maximum hot spot temperature is
115℃. 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.

FACING PWB

PWB

MODULE

THERMAL CURVES

Fiture 18: Hot spot temperature measured point

＊

The allowed maximum hot spot temperature is defined at 115

S48SA05006(Standard) Output Current vs. Ambient Temperature and Air Velocity

Output Current(A)

7.0

6.0

5.0

4.0

3.0

2.0

1.0

0.0

Natural

Convection

100LFM

65 70 75 80 85 90 95 100 105

@ Vin = 48V (Either Orienation)

600LFM

200LFM

300LFM

500LFM

400LFM

Ambient Temperature (℃)

℃

AIR VELOCIT
AND AMBIENT

TEMPERATURE

MEASURED BELOW

THE MODULE

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

Figure 17: Wind Tunnel Test Setup

DS_S48SA05006_06022006

IR FLOW

50.8 (2.0”)

10 (0.4”)

Figure 19: Output current vs. ambient temperature and air velocity

=48V

@V

in

9

PICK AND PLACE LOCATION SURFACE-MOUNT TAPE & REEL

RECOMMENDED PAD LAYOUT (SMD)

DS_S48SA05006_06022006

10

℃

LEADED (Sn/Pb) PROCESS RECOMMEND TEMP. PROFILE

Peak temp.

210~230°C 5sec.

Cooling down rate <3°C /sec.

250

150

Ramp-up temp.

0.5~3.0°C /sec.

2nd Ramp-up temp.

Pre-heat temp.

140~180°C 60~120 sec.

1.0~3.0°C /sec.

100

Temperature (°C )

50

Time ( sec. )

Note: The temperature refers to the pin of S48SA, measured on the pin 1 (+Vout ) joint.

Over 200°C

40~50sec.

300 60 0 120 180 240

LEAD FREE (SAC) PROCESS RECOMMEND TEMP. PROFILE

217℃
200

150

25℃

.

Peak Temp. 240 ~ 245

℃

℃

Ramp up
max. 3℃/sec.

Preheat time

100~140 sec.

Time Limited 90 sec.
above 217

℃

Time

Ramp down
max. 4℃/sec.

Temp

Note: The temperature refers to the pin of S48SA, measured on the pin 1 (+Vout ) joint.

DS_S48SA05006_06022006

11

MECHANICAL DRAWING

SMD Through-Hole

Pin No. Name Function

1 +Vout Positive output voltage
2 -Vout Negative output voltage
6 Trim Output voltage trim

8 ON/OFF ON/OFF logic
11 -Vin Negative input voltage
12 +Vin Positive input voltage

Optional Pin Name Function

4 +Sense (Option) Positive sense pin

5

9

DS_S48SA05006_06022006

-Sense (Option)
NC

Negative sense pin
No connection

12

PART NUMBERING SYSTEM

S 48 S A 050 06 N R F A*

Form

Factor

S- Small

Power

* Option code A includes 9 pins. Pins 4, 5, and 9 have no connection.

Option code B excludes pin 4, 5, and 9 (total 6 pins).

Option code C features 9 pins with sense function.

Input

Voltage

48V S- Single A- Advanced 1R2-1.2V

Number of

Outputs

Product

Series

Output

Voltage

1R5-1.5V
1R8-1.8V
2R5-2.5V
3R3- 3.3V
050- 5.0V
120- 12V

Output

Current

03- 3.0V
06- 6.6A
10- 10A
12- 12A

ON/OFF

Logic

N- Negative
P- Positive

Pin Type Option

Code

R- SMD
T- Through hole

F- RoHS 6/6
(Lead Free)

A- 9 pin, no sense
B- 6 pin, no sense
C- 9 pins with

sense
(12V has option B
only)

MODEL LIST

MODEL NAME INPUT OUTPUT EFF @ 100% LOAD

S48SA1R212NRFA 36V~75V 0.85A 1.2V 12A 84.0%
S48SA1R512NRFA 36V~75V 0.85A 1.5V 12A 88.0%
S48SA1R812NRFA 36V~75V 0.85A 1.8V 12A 88.0%

S48SA2R510NRFA 36V~75V 1.3A 2.5V 10A 88.5%

S48SA3R310NRFA 36V~75V 1.3A 3.3V 10A 90.5%
S48SA05006NRFA 36V~75V 1.3A 5.0V 6.6A 90.5%
S48SA12003NRFB 36V~75V 1.3A 12V 3.0A 90.0%

CONTACT:

USA:

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

Email: [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.

www.delta.com.tw/dcdc

Europe:

Phone: [phone]
Fax: [phone]
Email:

[e-mail]

Asia & the rest of world:

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

[e-mail]

Email:

DS_S48SA05006_06022006

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