Delta Electronics S48SE User manual

Delphi S48SE, 17W 1x1 Brick Series
DC/DC Power Modules: 48V in, 5.0V/3A out
The Delphi S48SE series, 1x1 form factor, 48V input, single output,
isolated DC/DC converters are the latest offering from a world leade
r
in power systems technology and manufacturing — Delta Electronics,
Inc. This product family is available in either a surface mount o
r
through-hole package and provides up to 17 watts of power or 5A o
f
output current (3.3V and below) in a standard 1x1 form facto
r
(1.1”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 5.0V/3A module is better than 87% and all modules are
fully protected from abnormal input/output voltage, current, and
temperature conditions.
OPTIONS
 Positive, negative, or no On/Off
 Trim pin
 OTP and Output OVP, OCP mode,
auto-restart (default) or latch-up
 Surface mounted version
 Short pin lengths
APPLICATIONS
 Optical Transport
 Data Networking
 Communications, including Wireless
and traditional Telecom
 Servers
FEATURES
 High efficiency: 87% @5.0V/3A
 Size: 27.9x24.4x8.3mm (1.1”x0.96”x0.33”)
 Industry standard 1x2 pinout
 SMT and Through-hole versions
 2:1 input voltage range
 Input UVLO, Output OCP, OVP and OTP
 Monotonic startup into normal and pre-bias
loads
 Output voltage trim ±10%
 2250V isolation and basic insulation
 No minimum load required
 ISO 9001, TL 9000, ISO 14001, QS 9000,
OHSAS 18001 certified manufacturing facilit
y
 UL/cUL 60950 (US & Canada) Recognized,
and TUV (EN60950) certified.
 CE mark meets 73/23/EEC and 93/68/EEC
directives
DATASHEET
DS_S48SE05003_12292006

DS_S48SE05003_12292006
2
TECHNICAL SPECIFICATIONS
TA = 25°C, airflow rate = 300 LFM, Vin = 48 Vdc, nominal Vout unless otherwise noted.
PARAMETER NOTES and CONDITIONS S48SE05003 (Standard)
Min. Typ. Max. Units
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Continuous 80 Vdc
Transient(100ms) 100ms 100 Vdc
Operating Temperature Refer to Figure 20 for measuring point -40 109 °C
Storage Temperature -55 125 °C
Input/Output Isolation Voltage 2250 Vdc
INPUT CHARACTERISTICS
Operating Input Voltage 36 75 Vdc
Input Under-Voltage Lockout
Turn-On Voltage Threshold 33 34 35 Vdc
Turn-Off Voltage Threshold 31 32 33 Vdc
Lockout Hysteresis Voltage 1.0 2 3.0 Vdc
Maximum Input Current 100% Load, 36Vin 0.5 A
No-Load Input Current 18 30 mA
Off Converter Input Current 7 mA
Inrush Current (I2t) 0.01 A2s
Input Reflected-Ripple Current P-P thru 12µH inductor, 5Hz to 20MHz 15 mA
Input Voltage Ripple Rejection 120 Hz 60 dB
OUTPUT CHARACTERISTICS
Output Voltage Set Point Vin=48V, Io=Io.max, Tc=25°C 4.925 5.0 5.075 Vdc
Output Voltage Regulation
Over Load Io=Io, min to Io, max ±3 ±10 mV
Over Line Vin=36V to 75V ±3 ±10 mV
Over Temperature Tc=-40°C to 100°C ±50 mV
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 50 mV
RMS Full Load, 1µF ceramic, 10µF tantalum 12 mV
Operating Output Current Range 0 3 A
Output DC Current-Limit Inception Output Voltage 10% Low 110 140 %
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 mV
Negative Step Change in Output Current 75% Io.max to 50% Io.max 100 mV
Settling Time (within 1% Vout nominal) 250 us
Turn-On Transient
Start-Up Time, From On/Off Control 16 25 ms
Start-Up Time, From Input 16 25 ms
Maximum Output Capacitance Full load; 5% overshoot of Vout at startup 1000 µF
EFFICIENCY
100% Load 87.0 %
60% Load 86.0 %
ISOLATION CHARACTERISTICS
Input to Output 2250 Vdc
Isolation Resistance 10 MΩ
Isolation Capacitance 1000 pF
FEATURE CHARACTERISTICS
Switching Frequency 400 kHz
ON/OFF Control, Negative Remote On/Off logic
Logic Low (Module On) Von/off -0.7 0.8 V
Logic High (Module Off) Von/off 2 18 V
ON/OFF Control, Positive Remote On/Off logic
Logic Low (Module Off) Von/off -0.7 0.8 V
Logic High (Module On) Von/off 2 18 V
ON/OFF Current (for both remote on/off logic) Ion/off at Von/off=0.0V 0.25 mA
Leakage Current (for both remote on/off logic) Logic High, Von/off=15V 30 uA
Output Voltage Trim Range Across Trim Pin & +Vo or –Vo, Pout≦max rated -10% 10% %
Output Over-Voltage Protection Over full temp range; 5.75 7.5 V
GENERAL SPECIFICATIONS
MTBF Io=80% of Io, max; Ta=25°C, 300LFM 5.71 M hours
Weight 9.2 grams
Over-Temperature Shutdown Refer to Figure 20 for measuring point 115 °C

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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. Figure 4: (For negative remote on/off logic) 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: (For negative remote on/off logic) Turn-on transient at
zero load current (5 ms/div). Vin=48V. Top Trace: Vout, 2V/div,
Bottom Trace: ON/OFF input, 2V/div.
Figure 6: (For positive remote on/off logic) 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.
50
55
60
65
70
75
80
85
90
0 0.4 0.8 1.2 1.6 2 2.4 2.8 3.2
OUTPUT CURRENT (A)
EFFICIENCY (%)
75Vin
36Vin
48Vin
0
0.4
0.8
1.2
1.6
2
2.4
2.8
0 0.4 0.8 1.2 1.6 2 2.4 2.8 3.2
OUTPUT CURRENT (A)
POWER DISSIPATION
75Vin
48Vin
36Vin
0
0.1
0.2
0.3
0.4
0.5
0.6
30 35 40 45 50 55 60 65 70 75
INPUT VOLTAGE (V)
INPUT CURRENT (A)

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ELECTRICAL CHARACTERISTICS CURVES (CON.)
Figure 7: (For positive remote on/off logic)Turn-on transient at zero
load current (5 ms/div). Vin=48V. Top Trace: Vout, 2V/div; Bottom
Trace: ON/OFF input, 2V/div.
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,
200us/div), Bottom Trace: Iout (1
A
/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,
200us/div), Bottom Trace: Iout (1
A
/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.

DS_S48SE05003_12292006
5
ELECTRICAL CHARACTERISTICS CURVES
Figure 11: Input Terminal Ripple Current, ic, at full rated output
current and nominal input voltage with 12µH source impedance and
33µF electrolytic capacitor (200mA/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)
Figure 13: Output voltage noise and ripple measurement test setup
Figure 14: Output voltage ripple at nominal input voltage and rated load
current (Io=3A)(20 mV/div, 1us/div)
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
Figure 15: Output voltage vs. load current showing typical current
limit curves and converter shutdown points
StripCopper
Vo(-)
Vo(+)
10u 1u SCOPE RESISTIV
LOAD
0
0.6
1.2
1.8
2.4
3
3.6
4.2
4.8
0123
OUTPUT CURRENT (A)
OUTPUT VOLTAGE (V)
48Vin
4

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DESIGN CONSIDERATIONS
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 Ωat 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
to 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, 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.
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.
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:
 The input source must be insulated from the ac
mains by reinforced or double insulation.
 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.
 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.
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.
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.
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.

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7
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, and enter 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.
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 over-voltage
set point, 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.
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.
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 floating.
Vi(+)
Vi(-)
ON/OFF
Vo(+)
Trim
Vo(-)
RLoad
Vi(+)
Vi(-)
ON/OFF
Vo(+)
Trim
Vo(-)
RLoad
Figure 16: Remote on/off implementation

DS_S48SE05003_12292006
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RLoad
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.
Vo (+)
Trim
Vo (-)
Rtrim-down
Vi (+)
Vi (-)
ON/OFF
RLoad
Vo (+)
Trim
Vo (-)
Rtrim-down
Vi (+)
Vi (-)
ON/OFF
Vo (+)
Trim
Vo (-)
Rtrim-down
Vi (+)
Vi (-)
ON/OFF
Rtrim_down Vo_adj 2.5−( ) 5110⋅
5.0 Vo_adj−
Figure 17: 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
(Fig. 17). The external resistor value required to obtain
an output voltage change from 5V to the desired
Vo_adj is defined as:
2050−
Ex. When Trim-down -10%
Vo_adj=5.0V×(1-10%)=4.5V
Rtrim_down 4.5 2.5−( ) 5110⋅
5.0 4.5−2050−
Rtrim_down 1.839 104 ×= ohm
Rtrim_up 2.5 5110⋅
5.5 5.0−2050−
Rtrim_up 2.35 104 ×= ohm
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.
Care should be taken to ensure that the maximum
output power of the module remains at or below the
maximum rated power.
Vo (+)
Trim
Vo (-)
RLoad
Rtrim-up
Vi (+)
Vi (-)
ON/OFF
Vo (+)
Trim
Vo (-)
RLoad
Rtrim-up
Vi (+)
Vi (-)
ON/OFF
Rtrim_up 2.5 5110⋅
Vo_adj 5.0−
Ex. When Trim-up +10%
Vo_adj=5.0V×(1+10%)=5.5V
2050−
Figure 18: 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 (Fig.
18). The external resistor value required to obtain an
output voltage change from 5V to the desired Vo_adj is
defined as:

DS_S48SE05003_12292006
9
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.
THERMAL CURVES
Figure 20: Hot spot location
S48SE05003(standard) Output Current vs. Ambient Temperature and Air Velocity
@Vin = 48V (Either Orientation)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
70 73 76 79 82 85
Natural
Convection
100LFM
200LFM
Figure 21: Output current vs. ambient temperature and air
velocity@ Vin=48V (Either Orientation)
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 is constantly kept at
6.35mm (0.25’’).
Figure 19: Wind tunnel test setup
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
12.7 (0.5”)
MODULE
A
IRFLO
W
50.8
(
2.0”
)
FACING PWB PWB
AIR VELOCIT
Y
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE

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PICKANDPLACELOCATION SURFACE-MOUNT TAPE & REEL
RECOMMENDED PAD LAYOUT (SMD)

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11
LEADED (Sn/Pb) PROCESS RECOMMEND TEMP. PROFILE
Time ( sec. )
Pre-heat temp.
140~180°C 60~120 sec.
Peak temp.
210~230°C 5sec.
Ramp-up temp.
0.5~3.0°C /sec.
Temperature (°C )
50
100
150
200
250
300600 120 180 240
2nd Ramp-up temp.
1.0~3.0°C /sec.
Over 200°C
40~50sec.
Cooling down rate <3°C /sec.
Note: The temperature refers to the pin of S48SE, measured on the pin +Vout joint.
LEAD FREE (SAC) PROCESS RECOMMEND TEMP. PROFILE
Temp.
Time
150℃
200℃
100~140 sec. Time Limited 90 sec.
above 217℃
217℃
Preheat time
Ramp up
max. 3℃/sec.
Ramp down
max. 4℃/sec.
Peak Tem
p
. 240 ~ 245
℃
25℃
Note: The temperature refers to the pin of S48SE, 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
ON/OFF (Optional)
-Vout
TRIM (Optional)
+Vout
Positive input voltage
Negative input voltage
Remote ON/OFF (Optional)
Negative output voltage
Output voltage trim (Optional)
Positive output voltage

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PART NUMBERING SYSTEM
S 48 S E 050 03 N R F A
Product
Type Input Voltage Number of Outputs Product Series Output Voltage Output Current ON/OFF Logic Pin Length/Type Option Code
S - Small
Power
48V-
36V~75V
S - Single 1x1, 5A 050 – 5.0V 03 - 3A
N - Negative
P - Positive
E - No
remote
on/off
control pin
R - 0.170”
N - 0.145”
K - 0.110”
M - SMD
F- RoHS 6/6
(Lead Free)
A - No trim pin
B - With trim pin
MODEL LIST
MODEL NAME INPUT OUTPUT EFF @ 100% LOAD
S48SE1R805NRFA 36V~75V 0.30A 1.8V 5A 85.0%
S48SE3R305NRFA 36V~75V 0.6A 3.3V 5A 87.0%
S48SE05003NRFA 36V~75V 0.5A 5.0V 3A 87.0%
S48SE12001NRFA 36V~75V 0.5A 12V 1.3A 88.0%
S48SE15001NRFA 36V~75V 0.5A 15V 1A 87.0%
Note:
1. Default remote on/off logic is negative;
2. Default pin length is 0.170”;
3. Default OTP and output OVP, OCP mode is auto-restart.
4. Default is no trim pin;
5. For different options, please refer to part numbering system above or contact your local sales office.
CONTACT: www.delta.com.tw/dcdc
USA:
Telephone:
East Coast: [phone]
West Coast: [phone]
Fax: [phone]
Email: [email protected]
Europe:
Phone: [phone]
Fax: [phone]
Email: [email protected]
Asia & the rest of world:
Telephone: [phone] ext 6220
Fax: [phone]
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.