FEATURES
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High efficiency: 81% @ 3.3V/4.5A
Standard footprint
Surface mountable
Industry standard pin out
Size: 45.5mm x 28.0mm x 12.2mm
(1.79” x 1.10” x 0.48”)
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Fixed frequency operation
Input UVLO, OVLO, Output OCP, OVP
No minimum load required
Wide Input voltage range: 18V~60V
ISO 9001, TL 9000, ISO 14001, QS9000,
OHSAS18001 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 directive
Delphi Series S36SS, 15W Family
DC/DC Power Modules: 18Vin to 60Vin, 3.3V/4.5A out
OPTIONS
ꢀ
Positive on/off logic
The Delphi Series S36SS, surface mountable, wide ranging 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 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.
APPLICATIONS
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Telecom/DataCom
Wireless Networks
Optical Network Equipment
Server and Data Storage
Industrial/Test Equipment
DATASHEET
DS_S36SS3R304_04062006
1
Delta Electronics, Inc.
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ELECTRICAL CHARACTERISTICS CURVES
90
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
85
80
75
70
65
18Vin
24Vin
48Vin
60Vin
18Vin
24Vin
60
55
48Vin
60Vin
50
0.5
1
1.5
2
2.5
3
3.5
4
4.5
0.5
1
1.5
2
2.5
3
3.5
4
4.5
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.
1.00
Io=4.5A
I0=2.7A
Io=0.45
0.80
0.60
0.40
0.20
0.00
15
20
25
30
35
40
45
50
55
60
INPUT V OLTA GE (V )
Figure 3: Typical input characteristics at room temperature.
Figure 4: Turn-on transient at full rated load current (resistive
load) (2 ms/div). Top Trace: Vout (1V/div); Bottom Trace:
ON/OFF Control (2V/div).
3
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ELECTRICAL CHARACTERISTICS CURVES
Figure5: Turn-on transient at zero load current (2 ms/div). Top
Trace: Vout (1V/div); Bottom Trace: ON/OFF Control (2V/div).
Figure 6: Output voltage response to step-change in load
current (50%-100%-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 (2A/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
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
source Inductance (LTEST) of 12 µH. Capacitor Cs offset possible
battery impedance.
4
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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.
3.5
3.0
2.5
2.0
1.5
1.0
0.5
Vin=48V
0.0
0.0
2.0
4.0
6.0
8.0
LOAD CURRENT (A)
Figure 11: Output voltage vs. load current showing typical
current limit curves and converter shutdown points.
5
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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 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.
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
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.
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 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.
6
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20.373 − 32.637 ×0.1
3.3×0.1+ 0.018
FEATURES DESCRIPTIONS
Rtrim − down =
−10.2 = 38.96
[
ΚΩ
]
Over-Current Protection
Vo(+)
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).
Trim
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 13: 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:
12.2636
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 (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.
Rtrim − up =
[
−10.2 ΚΩ
]
3.3∆Vo −0.018
Ex. When trim-up +10% (3.3V X 1.1 = 3.63V)
12.2636
Output Voltage Adjustment (TRIM)
Rtrim −up =
[
−10.2 = 29.11 ΚΩ
]
3.3×0.1−0.018
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.
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 12: Circuit configuration for trim-down (decrease output
voltage)
Vi(+)
Vo(+)
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:
ON/OFF Trim
20.373 − 32.673∆Vo
3.3∆Vo +0.018
Rtrim − down =
[
−10.2 ΚΩ
]
Vi(-)
Vo(-)
Ex. When trim-down –10% (3.3V X 0.9 = 2.97V)
Figure 14: Circuit configuration for remote ON/OFF
7
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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.
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 hot spot temperature is defined at
+105°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.
PWB
MODULE
FACING PWB
AIR VELOCITY
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE
50.8 (2.0”)
AIR FLOW
10 (0.4”)
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
Figure 15: Wind tunnel test setup
8
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THERMAL CURVES
S36SS3R304(Standard) Output Current vs. Ambient Temperature and Air Velocity
@ Vin = 60V
Output Current(A)
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
Natural
Convection
100LFM
200LFM
300LFM
400LFM
500LFM
600LFM
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (℃)
Figure 16: Temperature measurement location. Pin locations
are for reference only.
＊The allowed maximum hot spot temperature is defined at
Figure 19: Output current vs. ambient temperature and air
velocity (Vin=60V)
105℃
S36SS3R304(Standard) Output Current vs. Ambient Temperature and Air Velocity
@ Vin = 24V
Output Current(A)
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
Natural
Convection
100LFM
200LFM
300LFM
400LFM
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (℃)
Figure 17: Output current vs. ambient temperature and air
velocity (Vin=24V)
S36SS3R304(Standard) Output Current vs. Ambient Temperature and Air Velocity
@ Vin = 48V
Output Current(A)
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
Natural
Convection
100LFM
200LFM
300LFM
400LFM
500LFM
600LFM
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (℃)
Figure 18: Output current vs. ambient temperature and air
velocity (Vin=48V)
9
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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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PART NUMBERING SYSTEM
S
36
S
S
3R3
04
N
R
F
A
Form
Factor
S- Small
Power
Input
Voltage
36- 18V~ 60V
Number of Product
Output
Voltage Current
3R3- 3.3V 04- 4.5A
Output
ON/OFF
Logic
N- Negative R- SMD Pin
Pin Type
Option
Code
A- Standard
Outputs
Series
S- Single
S- SMD
Space-RoHS 5/6
P- Positive
Function
F- RoHS 6/6
(Lead Free)
MODEL LIST
MODEL NAME
INPUT
OUTPUT
EFF @ 100% LOAD
S36SS3R304NRFA
18V- 60V
1.3A
3.3V
4.5A
81%
USA:
Telephone:
East Coast: (888) 335 8201
West Coast: (888) 335 8208
Fax: (978) 656 3964
Europe:
Phone: +41 31 998 53 11
Fax: +41 31 998 53 53
Asia & the rest of world:
Telephone: +886 3 4526107 ext 6220
Fax: +886 3 4513485
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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