FEATURES
ꢀ
High efficiency: 88.5% @ 1.8V/ 12A
ꢀ
Size: 47.2mm x 29.5mm x 8.35mm
(1.86" x 1.16" x 0.33")
ꢀ
ꢀ
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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,
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
Delphi Series S48SA, 33W Family
DC/DC Power Modules: 48V in, 1.8V/12A out
OPTIONS
ꢀ
Positive on/off logic
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 power
or up to 12A of output current (for output voltage 1.8V or below). 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. All models are protected from
abnormal input/output voltage and current conditions.
ꢀ
Through hole version
APPLICATIONS
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Telecom/DataCom
Wireless Networks
Optical Network Equipment
Server and Data Storage
Industrial/Test Equipment
DATASHEET
DS_S48SA1R812_06012006
Delta Electronics, Inc.
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ELECTRICAL CHARACTERISTICS CURVES
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
95
90
85
80
75
70
36Vin
65
36Vin
48Vin
75Vin
48Vin
75Vin
60
55
1
2
3
4
5
6
7
8
9
10 11 12
1
2
3
4
5
6
7
8
9
10 11 12
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.
0.8
Io=12A
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
Io=7.2A
Io=1.2A
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 (1 ms/div).
Top Trace: Vout (500mV/div); Bottom Trace: ON/OFF Control
(5V/div).
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ELECTRICAL CHARACTERISTICS CURVES
Figure5: Turn-on transient at zero load current (1 ms/div). Top
Trace: Vout (500mV/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 mΩESR tantalum capacitor and 1µF ceramic capacitor.
Top Trace: Vout (50mV/div), Bottom Trace: Iout (5A/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 mΩESR tantalum capacitor and 1µF ceramic
capacitor. Top Trace: Vout (50mV/div), Bottom Trace: Iout
5A/div).
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 (LTEST) of 12 µH. Capacitor Cs offset
possible battery impedance.
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ELECTRICAL CHARACTERISTICS CURVES
Copper Strip
Vo(+)
Vo(-)
SCOPE
RESISTIVE
LOAD
10u
1u
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.
Figure 9: Input Reflected Ripple Current, i , at full rated output
current and nominal input voltage with 12µH source impedance
and 33µF electrolytic capacitor (2 mA/div).
s
2.1
1.8
1.5
1.2
0.9
0.6
0.3
Vin=48V
0.0
0.0
2.0
4.0
6.0
8.0
10.0
12.0
14.0
16.0
LOAD CURRENT (A)
Figure 11: 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.
Figure 12: Output voltage vs. load current showing typical
current limit curves and converter shutdown points.
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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:
ꢀ
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.
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FEATURES DESCRIPTIONS
Vi(+)
Vo(+)
Over-Current Protection
Sense(+)
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).
ON/OFF
Sense(-)
Vi(-)
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: 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:
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 (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.
[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).
Over-Temperature Protection
Vi(+) Vo(+)
Sense(+)
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.
Sense(-)
The module will try to restart after shutdown. If the over-
temperature condition still exists during restart, the
module will shut down again. This restart trial will
continue until the temperature is within specification.
Vi(-) Vo(-)
Contact
Resistance
Contact and Distribution
Losses
Figure 14: Effective circuit configuration for remote sense
operation
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.
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.
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.
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.
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.
Care should be taken to ensure that the maximum output
power does not exceed the maximum rated power.
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23.8(100 + ∆Vo%) −1089
∆Vo%
Rtrim −up =
−104[ΚΩ
]
Output Voltage Adjustment (TRIM)
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.
Ex. When trim-up +10% (1.8V X 1.1 = 1.98V)
23.8(100 +10) −1089
Rtrim −up =
−104 = 48.9
[
ΚΩ
]
10
Care should be taken to ensure that the maximum
output power of the module remains at or below the
maximum rated power.
Figure 15: 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:
1089
Rtrim − down =
[
−104 ΚΩ
]
∆Vo%
Ex. When trim-down –10% (1.8V X 0.9 = 1.62V)
1089
Rtrim − down =
[
−104 = 4.9 ΚΩ
]
10
Figure 16: 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. The
external resistor value required to obtain a percentage
output voltage change △Vo% is defined as:
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THERMAL CONSIDERATIONS
THERMAL CURVES
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.
Figure 18: Hot spot temperature measured point
＊The allowed maximum hot spot temperature is defined at
110℃
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”).
S48SA1R812(Standard) Output Current vs. Ambient Temperature and Air Velocity
Output Current(A)
@ Vin < 60V
14
12
10
8
Thermal Derating
600LFM
Heat can be removed by increasing airflow over the
module. Figure 18 and 19 show maximum output is a
function of ambient temperature and airflow rate. 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.
500LFM
Natural
Convection
400LFM
100LFM
6
200LFM
4
2
300LFM
85
PWB
FACING PWB
0
MODULE
65
70
75
80
90
95
100
Ambient Temperature (℃)
Figure 19: Output current vs. ambient temperature and air velocity
@Vin< 60V
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 17: 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 S48SA, 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 S48SA, measured on the pin +Vout joint.
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MECHANICAL DRAWING
SMD
Through-Hole
Pin No.
Name
+Vout
-Vout
Trim
ON/OFF
-Vin
Function
1
2
6
8
11
12
Positive output voltage
Negative output voltage
Output voltage trim
ON/OFF logic
Negative input voltage
Positive input voltage
+Vin
Optional Pin Name
Function
4
5
9
+Sense (Option)
-Sense (Option)
NC
Positive sense pin
Negative sense pin
No connection
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PART NUMBERING SYSTEM
S
48
S
A
1R8
12
N
R
F
A*
Form
Factor Voltage
S- Small
Power
Input Number of Product
Output
Voltage
Output
Current
03- 3.0V
06- 6.6A
10- 10A
12- 12A
ON/OFF
Logic
N- Negative R- SMD
P- Positive T-Through
hole
Option
Code
A- 9 pin, no sense
B- 6 pin, no sense
C- 9 pins with sense
(12V has option B
only)
Pin Type
Outputs
Series
48V
S- Single
A- Advanced 1R2-1.2V
F- RoHS 6/6
(Lead Free)
1R5-1.5V
1R8-1.8V
2R5-2.5V
3R3- 3.3V
050- 5.0V
120- 12V
* 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.
MODEL LIST
MODEL NAME
INPUT
OUTPUT
EFF @ 100% LOAD
S48SA1R212NRFA
S48SA1R512NRFA
S48SA1R812NRFA
S48SA2R510NRFA
S48SA3R310NRFA
S48SA05006NRFA
S48SA12003NRFB
36V~75V
36V~75V
36V~75V
36V~75V
36V~75V
36V~75V
36V~75V
0.85A
0.85A
0.85A
1.3A
1.2V
1.5V
1.8V
2.5V
3.3V
5.0V
12V
12A
12A
12A
10A
10A
6.6A
3.0A
84.0%
88.0%
88.0%
88.5%
90.5%
90.5%
90.0%
1.3A
1.3A
1.3A
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.
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