FEATURES
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High efficiency: 90% @5V/7A
Industry standard 1x2 pin out
Size: 33.0x24.4x8.55mm
(1.30”x0.96”x0.34”)
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SMD and Through-hole versions
Fixed frequency operation
2:1 input voltage range
Input UVLO, OVP
OTP and output OCP, OVP (default is
auto-restart)
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Output voltage trim ±10%
Negative On/Off
Monotonic startup into normal and
pre-biased loads
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2250V isolation and basic insulation
No minimum load required
ISO 9001, TL 9000, ISO 14001, QS9000,
OHSAS18001 certified manufacturing facility
UL/cUL 60950 (US & Canada) recognized,
and TUV (EN60950) certified
CE mark meets 73/23/EEC and 93/68/EEC
directive
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Delphi Series S48SP, 35W 1x1 Brick
DC/DC Power Modules: 48V in, 5V/7A out
OPTIONS
The Delphi Series S48SP, 1x1 Brick, 48V input, single output, isolated
DC/DC converters are the latest offering from a world leader in power
systems technology and manufacturing -- Delta Electronics, Inc. This
product family is available in a surface mount or through-hole package
and provides up to 35 watts of power or 10A of output current (3.3V and
below) in a new 1x1 form factor (1.3”x0.96”x0.33”). The pinout is
compatible with the industry standard 1x2 products. With creative
design technology and optimization of component placement, these
converters possess outstanding electrical and thermal performance, as
well as extremely high reliability under highly stressful operating
conditions. Typical efficiency of the 5V/7A module is 90%. All modules
are fully protected against abnormal input/output voltage, current, and
temperature conditions.
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Positive On/Off or no On/Off
OTP and Output OVP, OCP mode,
Auto recovery (default) or latch-up
SMD module available
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Short pin lengths
Encapsulated case optional
APPLICATIONS
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Optical Transport
Data Networking
Communications, including Wireless and
traditional Telecom
Servers
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DATASHEET
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ELECTRICAL CHARACTERISTICS CURVES
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 full load input characteristics at room
temperature
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ELECTRICAL CHARACTERISTICS CURVES
For Negative Remote On/Off Logic
0
0
0
0
Figure 4: Turn-on transient at full rated load current (5 ms/div).
Vin=48V. Top Trace: Vout, 2V/div; Bottom Trace: ON/OFF input,
2V/div
Figure 5: Turn-on transient at zero load current (5 ms/div).
Vin=48V. Top Trace: Vout, 2V/div, Bottom Trace: ON/OFF input,
2V/div
For Positive Remote On/Off Logic
0
0
0
0
Figure 6: Turn-on transient at full rated load current (5 ms/div).
Vin=48V. Top Trace: Vout, 2V/div; Bottom Trace: ON/OFF input,
2V/div
Figure 7: Turn-on transient at zero load current (5 ms/div).
Vin=48V. Top Trace: Vout, 2V/div; Bottom Trace: ON/OFF input,
2V/div
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ELECTRICAL CHARACTERISTICS CURVES
0
0
0
0
Figure 8: Output voltage response to step-change in load
current (75%-50% of Io, max; di/dt = 0.1A/µs). Load cap: 10µF
tantalum capacitor and 1µF ceramic capacitor. Top Trace: Vout
(100mV/div, 50us/div), Bottom Trace: Iout (2A/div). 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 9: Output voltage response to step-change in load
current (50%-75% of Io, max; di/dt = 0.1A/µs). Load cap: 10µF
tantalum capacitor and 1µF ceramic capacitor. Top Trace: Vout
(100mV/div, 50us/div), Bottom Trace: Iout (2A/div). 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: Test set-up diagram showing measurement points
for Input Terminal Ripple Current and Input Reflected Ripple
Current.
Note: Measured input reflected-ripple current with a simulated
source Inductance (LTEST) of 12 μH. Capacitor Cs offset
possible battery impedance. Measure current as shown below.
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ELECTRICAL CHARACTERISTICS CURVES
0
0
Figure 11: Input Terminal Ripple Current, ic, at full rated output
current and nominal input voltage with 12µH source impedance
and 33µF electrolytic capacitor (100mA/div, 1us/div)
Figure 12: Input reflected ripple current, is, through a 12µH
source inductor at nominal input voltage and rated load current
(20 mA/div, 1us/div)
Copper Strip
Vo(+)
SCOPE
RESISTIVE
LOAD
10u
1u
Vo(-)
Figure 13: Output voltage noise and ripple measurement test
setup
0
Figure 14: Output voltage ripple at nominal input voltage and
rated load current (Io=7A)(20 mV/div, 1us/div)
Figure 15: Output voltage vs. load current showing typical
current limit curves and converter shutdown points
Load capacitance: 1µF ceramic capacitor and 10µF tantalum
capacitor. Bandwidth: 20 MHz. Scope measurements 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
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DESIGN CONSIDERATIONS
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The input source must be insulated from the ac
mains by reinforced or double insulation.
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.
The input terminals of the module are not operator
accessible.
If the metal baseplate is grounded, one Vi pin and
one Vo pin shall also be grounded.
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A SELV reliability test is conducted on the system
where the module is used, in combination with the
module, to ensure that under a single fault,
hazardous voltage does not appear at the module’s
output.
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
to release.
When installed into a Class II equipment (without
grounding), spacing consideration should be given to
the end-use installation, as the spacing between the
module and mounting surface have not been evaluated.
The power module has extra-low voltage (ELV) outputs
when all inputs are ELV.
Safety Considerations
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
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.
The power module must be installed in compliance with
the spacing and separation requirements of the
end-user’s safety agency standard, i.e., UL60950,
CAN/CSA-C22.2 No. 60950-00 and EN60950: 2000 and
IEC60950-1999, if the system in which the power
module is to be used must meet safety agency
requirements.
Soldering and Cleaning Considerations
Basic insulation based on 75 Vdc input is provided
between the input and output of the module for the
purpose of applying insulation requirements when the
input to this DC-to-DC converter is identified as TNV-2
or SELV. An additional evaluation is needed if the
source is other than TNV-2 or SELV.
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
When the input source is SELV circuit, 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:
un-encapsulated and/or open frame type power
modules. For assistance on appropriate soldering and
cleaning procedures, please contact Delta’s technical
support team.
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FEATURES DESCRIPTIONS
Remote On/Off
Over-Current Protection
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.
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, and enter hiccup mode or
latch mode, which is optional.
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 hiccup mode, the module 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.
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 floating.
For latch mode, the module will latch off once it
shutdown. The latch is reset by either cycling the input
power or by toggling the on/off signal for one second.
Over-Voltage Protection
ON/OFF
Vo(-)
Trim
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 enter in hiccup
mode or latch mode, which is optional.
Vi(-)
R
Load
Vi(+)
For hiccup mode, the module 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.
Vo(+)
Figure 16: Remote on/off implementation
For latch mode, the module will latch off once it
shutdown. The latch is reset by either cycling the input
power or by toggling the on/off signal for one second.
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, and enter in hiccup mode or
latch mode, which is optional.
For hiccup mode, the module 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.
For latch mode, the module will latch off once it
shutdown. The latch is reset by either cycling the input
power or by toggling the on/off signal for one second.
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FEATURES DESCRIPTIONS (CON.)
Output Voltage Adjustment
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.
ON/OFF
Vo (-)
Trim
R
trim-up
Vi (-)
R
Load
Vi (+)
Vo (+)
Vo (-)
Trim
ON/OFF
Figure 18: Circuit configuration for trim-up (increase output
Vi (-)
R
voltage)
Load
R
trim-down
Vi (+)
If the external resistor is connected between the TRIM
and Vo(-) the output voltage set point increases (Fig.
18). The external resistor value required to obtain an
output voltage change from 5V to the desired Vo_adj is
defined as:
Vo (+)
Figure 17: Circuit configuration for trim-down (decrease
output voltage)
2.5⋅5110
Rtrim_up
− 2050
If the external resistor is connected between the TRIM
and Vo(+) pins, the output voltage set point decreases
(Fig. 17). The external resistor value required to obtain
an output voltage change from 5V to the desired
Vo_adj is defined as:
Vo_adj − 5.0
Ex. When Trim-up +10%
Vo_adj=5.0V×(1+10%)=5.5V
2.5⋅5110
(Vo_adj − 2.5)⋅5110
Rtrim_up
− 2050
Rtrim_down
− 2050
5.5 − 5.0
5.0 − Vo_adj
4
Rtrim_up = 2.35× 10
ohm
Ex. When Trim-down -10%
Vo_adj=5.0V×(1-10%)=4.5V
When using trim function, the output voltage of the
module is usually increased, which increases the power
output of the module with the same output current.
(4.5 − 2.5)⋅5110
Rtrim_down
− 2050
5.0 − 4.5
Care should be taken to ensure that the maximum
output power of the module remains at or below the
maximum rated power.
4
Rtrim_down = 1.839× 10
ohm
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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.
Thermal Derating
Heat can be removed by increasing airflow over the module. 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.
Hence, the choice of equipment to characterize the
thermal performance of the power module is a wind
tunnel.
THERMAL CURVES
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 constantly kept at
6.35mm (0.25’’).
Figure 20: Hot spot temperature measured point
＊The allowed maximum hot spot temperature is defined at 111℃
PWB
MODULE
FACING PWB
S48SP05007(standard) Output Current vs. Ambient Temperature and Air Velocity
Output Current(A)
@Vin = 48V (Either Orientation)
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
Natural
Convection
100LFM
AIR VELOCITY
200LFM
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
300LFM
400LFM
500LFM
50.8 (2.0”)
600LFM
AIR FLOW
12.7 (0.5”)
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
Figure 21: Output current vs. ambient temperature and air velocity
@Vin=48V (Either Orientation)
Figure 19: Wind tunnel test setup
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PICK AND PLACE LOCATION
SURFACE-MOUNT TAPE & REEL
RECOMMENDED PAD LAYOUT (SMD)
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LEADED (Sn/Pb) PROCESS RECOMMEND TEMP. PROFILE
Peak temp.
2nd Ramp-up temp.
210~230°C 5sec.
1.0~3.0°C /sec.
250
Pre-heat temp.
140~180°C 60~120 sec.
200
Cooling down rate <3°C /sec.
Ramp-up temp.
0.5~3.0°C /sec.
150
100
50
Over 200°C
40~50sec.
0
60
120
Time ( sec. )
180
240
300
Note: The temperature refers to the pin of S48SP, measured on the pin +Vout joint.
LEAD FREE (SAC) PROCESS RECOMMEND TEMP. PROFILE
.
Temp
Peak Temp. 240 ~ 245 ℃
217℃
200℃
Ramp down
max. 4℃/sec.
Preheat time
100~140 sec.
150℃
25℃
Time Limited 90 sec.
above 217℃
Ramp up
max. 3℃/sec.
Time
Note: The temperature refers to the pin of S48SP, measured on the pin +Vout joint.
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MECHANICAL DRAWING
Surface-mount module
Through-Hole module
Pin No.
Name
Function
1
2
3
4
5
6
+Vin
-Vin
Positive input voltage
Negative input voltage
Remote ON/OFF (Optional)
Negative output voltage
Output voltage trim (Optional)
Positive output voltage
ON/OFF (Optional)
-Vout
TRIM (Optional)
+Vout
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PART NUMBERING SYSTEM
R
S
48
S
P
050
07
N
F
B
Product
Type
Input Number of Product
Output
Voltage
050 - 5V
Output
Current
07 - 7A
Pin
ON/OFF Logic
Option Code
Voltage Outputs
Series
Length/Type
R - 0.170” F- RoHS 6/6 A - No trim pin
S - Small
Power
48 -
S - Single
1x1, 10A
N - Negative
(Default)
36V~75V
(Default) (Lead Free) B - With trim pin
P - Positive
N - 0.145”
(Default)
E - No remote
on/off control pin
K - 0.110”
M - SMD
MODEL LIST
MODEL NAME
INPUT
OUTPUT
EFF @ 100% LOAD
S48SP3R310NRFB
S48SP05007NRFB
S48SP12003NRFB
S48SP15002NRFB
36V~75V
1.1A
1.2A
1.2A
1A
3.3V
10A
89.0%
90.0%
90.0%
90.0%
36V~75V
36V~75V
36V~75V
5.0V
12V
15V
7A
3A
2A
Note:
1. Default OTP and output OVP, OCP mode is auto-restart;
2. For different option, please refer to part numbering system above or contact Delta local sales.
USA:
Europe:
Asia & the rest of world:
Telephone:
Telephone: +41 31 998 53 11
Fax: +41 31 998 53 53
Email: [email protected]
Telephone: +886 3 4526107 x6220
Fax: +886 3 4513485
Email: [email protected]
East Coast: (888) 335 8201
West Coast: (888) 335 8208
Fax: (978) 656 3964
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.
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