FEATURES
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High efficiency: 86.5% @ 12V/1.25A
Standard footprint
Surface mountable
Industry standard pin out
Low profile: 0.48”
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
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UL/cUL 60950 (US & Canada)
Recognized, and TUV (EN60950)
Certified
CE mark meets 73/23/EEC and
93/68/EEC directives
Delphi Series S48SS, 15W Family
DC/DC Power Module: 48V in, 12V/1.25A out
The Delphi Series S48SS, 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 15 watts of 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 Power converters possess
outstanding electrical and thermal performance, as well as extremely
high reliability under highly stressful operating conditions. All models
are protected from abnormal input/output voltage and current
conditions. An encapsulated version is available for the most robust
performance in harsh environments.
Applications
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Telecom/DataCom
Wireless Networks
Optical Network Equipment
Server and Data Storage
Industrial/Test Equipment
DATASHEET
DS_S48SS12001_06082006
1
Delta Electronics, Inc.
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DS_S48SS12001_06082006
ELECTRICAL CHARACTERISTICS CURVES
90
85
80
75
70
65
60
4.0
36Vin
48Vin
75Vin
36Vin
48Vin
75Vin
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0.25
0.5
0.75
1
1.25
0.25
0.5
0.75
1
1.25
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
Figure 1: Efficiency vs. load current for minimum, nominal, and
Figure 2: Power dissipation vs. load current for minimum,
maximum input voltage at 25°C.
nominal, and maximum input voltage at 25°C.
0.6
Io=1.25A
Io=0.75A
Io=0.125A
0.5
0.4
0.3
0.2
0.1
0.0
30 35 40 45 50 55 60 65 70 75
INPUT VOLTAGE (V)
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: Vout (5V/div); Bottom Trace:
ON/OFF Control (2V/div).
3
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DS_s48SS12001_06082006
ELECTRICAL CHARACTERISTICS CURVES
Figure5: Turn-on transient at zero load current (10 ms/div). Top
Trace: Vout (5V/div); Bottom Trace: ON/OFF Control (2V/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 mΩESR tantalum capacitor and 1µF
ceramic capacitor. Top Trace: Vout (50mV/div), Bottom
Trace: Iout (0.5A/div).
i
s
TEST
12uH
Cs:68uF/100V
Vi(+)
Vi(-)
68uF/100V
ESR< 0.3
ESR< 0.3
Ω
Ω
﹫20℃100KHz
﹫20℃100KHz
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 (LTEST) of 12 µH. Capacitor Cs offset possible
battery impedance.
Figure 8: Input Reflected Ripple Current, i , at full rated
output current and nominal input voltage with 12µH source
impedance and 68µF electrolytic capacitor (2 mA/div)
s
4
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DS_s48SS12001_06082006
ELECTRICAL CHARACTERISTICS CURVES
Copper Strip
Vo(+)
SCOPE
RESISTIVE
LOAD
10u
1u
Vo(-)
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 (20 mV/div). Load capacitance: 1µF ceramic
capacitor and 10µF tantalum capacitor. Bandwidth: 20 MHz.
14.0
12.0
10.0
8.0
6.0
4.0
2.0
Vin=48V
0.0
0.0
0.5
1.0
1.5
2.0
2.5
LOAD CURRENT (A)
Figure 11: Output voltage vs. load current showing typical
current limit curves and converter shutdown points.
5
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DS_s48SS12001_06082006
THERMAL CURVES:
S48SS12001NR A 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
0.3
0.2
0.1
0.0
600LFM
Natural
500LFM
Convection
400LFM
100LFM
200LFM
300LFM
75
80
85
90
95
100
105
Ambient Temperature (℃)
Top View
Figure 12: Case temperature measurement location. Pin locations are
Figure 13: Output current vs. ambient temperature and air velocity (Vin
for reference only.
<60V)
S48SS12001NR A Output Current vs. Ambient Temperature and Air Velocity @Vin = 75V
Output Current(A)
1.3
S48SS12001NR A Power Dissipation vs. Ambient Temperature and Air Velocity
Power Dissipation (Watts)
3.2
3.0
2.8
1.2
600LFM
1.1
600LFM
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
500LFM
1.0
Natural
Convection
0.9
500LFM
400LFM
0.8
Natural
Convection
100LFM
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
400LFM
200LFM
100LFM
300LFM
200LFM
300LFM
70
75
80
85
90
95
100
105
70
75
80
85
90
95
100
Ambient Temperature (℃)
Ambient Temperature (℃)
Figure 14: Output current vs. ambient temperature and air velocity
(Vin=75V)
Figure 15: Power dissipation vs. ambient temperature and air
velocity.
6
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DS_s48SS12001_06082006
DESIGN CONSIDERATION
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.
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.
Soldering and Cleaning Considerations
Layout and EMC 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.
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 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:
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The input source must be insulated from any
hazardous voltages, including the ac mains, with
reinforced insulation.
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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 non-
SELV voltage to appear between the output pin and
ground.
7
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DS_s48SS12001_06082006
FEATURES DESCRIPTIONS
Over-Current Protection
Vo(+)
Trim
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).
Rtrim-up
Vo(-)
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.
Figure 17: Circuit configuration for trim-up (increase output
voltage)
Over-Voltage Protection
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:
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 input
power or by togging the ON/OFF signal for one second.
25.668
Rtrim − up =
[
−3.32 ΚΩ
]
12∆Vo − 0.07
Ex. When trim-up +10% (12V X 1.1 = 13.2V)
Output Voltage Adjustment (TRIM)
25.668
Rtrim − up =
− 3.32 = 19.39[ΚΩ
]
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.
12× 0.1− 0.07
Care should be taken to ensure that the maximum
output power of the module remains at or below the
maximum rated power.
Remote ON/OFF
Vo(+)
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. If the remote on/off feature
is not used, please short the on/off pin to Vi(-) for
negative logic and let the pin open for positive logic.
Rtrim-down
Trim
Vo(-)
Figure 16: 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:
Vi(+)
Vo(+)
ON/OFF Trim
222.732 − 248.4∆Vo
Rtrim − down =
[
−3.32 ΚΩ
]
12∆Vo + 0.07
Vi(-)
Vo(-)
Ex. When trim-down –10% (12V X 0.9 =10.8V)
222.732 − 248.4× 0.1
Rtrim − down =
− 3.32 = 152.50[ΚΩ
]
12× 0.1+ 0.07
Figure 18: Circuit Configuration for Remote ON/OFF
8
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DS_s48SS12001_06082006
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.
PWB
MODULE
FACING PWB
Hence, the choice of equipment to characterize the
thermal performance of the power module is a wind
tunnel.
AIR VELOCITY
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
50.8 (2.0”)
Thermal Testing Setup
AIR FLOW
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.
10 (0.4”)
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
Figure 19: Wind tunnel test setup
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 and 14 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.
9
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DS_s48SS12001_06082006
MECHANICAL DRAWING
Pin No.
Name
+Vout
-Vout
Trim
NC
Function
1
2
3
Positive output voltage
Negative output voltage
Output voltage trim
No Connection
4
5
NC
No Connection
6
NC
No Connection
7
NC
No Connection
8
9
ON/OFF
NC
ON/OFF Logic
No Connection
10
11
12
NC
-Vin
+Vin
No Connection
Negative input voltage
Positive input voltage
10
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DS_s48SS12001_06082006
PART NUMBERING SYSTEM
S
48
S
S
120
01
N
R
F
A
Form
Factor
S- Small
Power
Input
Voltage
48V-
Number of Product
Output
Voltage
120- 12.0V
Output
Current
01- 1.25A
ON/OFF Pin Length
Logic
N- Negative R- SMD Pin
Option
Code
A- Standard
Outputs
Series
S- Single
S- SMD
F- RoHS 6/6
(Lead Free)
36V~75V
P- Positive
Function
MODEL LIST
MODEL NAME
INPUT
OUTPUT
EFF @ 100% LOAD
S48SS1R805NRFA
S48SS2R504NRFA
S48SS3R303NRFA
S48SS3R304NRFA
S48SS05002NRFA
S48SS05003NRFA
36V~75V
0.5A
1.8V
5.0A
4.5A
3.0A
4.5A
2.0A
3.0A
1.25A
80.0%
83.0%
84.0%
86.0%
84.0%
86.5%
86.5%
36V~75V
36V~75V
36V~75V
36V~75V
36V~75V
36V~75V
0.5A
0.5A
0.6A
0.5A
0.6A
0.6A
2.5V
3.3V
3.3V
5.0V
5.0V
12V
S48SS12001NRFA
CONTACT: www.delta.com.tw/dcdc
USA:
Asia & the rest of world:
Telephone: +886 3 4526107 ext 6220
Fax: +886 3 4513485
Europe:
Phone: +41 31 998 53 11
Fax: +41 31 998 53 53
Telephone:
East Coast: (888) 335 8201
West Coast: (888) 335 8208
Fax: (978) 656 3964
Email: [email protected]
Email: [email protected]
Email: [email protected]
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.
11
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