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Delphi Series S48SA, 33W Family
DC/DC Power Modules: 48V in, 1.8V/12A out
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.
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")
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
OPTIONS
Positive on/off logic
Through hole version
APPLICATIONS
Telecom/DataCom
Wireless Networks
Optical Network Equipment
Server and Data Storage
Industrial/Test Equipment
DATASHEET
DS_S48SA1R812_06012006
Delta Electronics, Inc.
TECHNICAL SPECIFICATIONS
(T
A
=25°C, airflow rate=300 LFM, V in
=48Vdc, nominal Vout unless otherwise noted.)
PARAMETER
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Continuous
Transient (100ms)
Operating Temperature
Storage Temperature
Input/Output Isolation Voltage
INPUT CHARACTERISTICS
Operating Input Voltage
Input Under-Voltage Lockout
Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Lockout Hysteresis Voltage
Maximum Input Current
No-Load Input Current
Off Converter Input Current
Inrush Current(I 2 t)
Input Reflected-Ripple Current
Input Voltage Ripple Rejection
OUTPUT CHARACTERISTICS
Output Voltage Set Point
Output
Over Load
Over Line
Over Temperature
Total Output Voltage Range
Output Voltage Ripple and Noise
Peak-to-Peak
RMS
Operating Output Current Range
Output DC Current-Limit Inception
DYNAMIC CHARACTERISTICS
Output Voltage Current Transient
Positive Step Change in Output Current
Negative Step Change in Output Current
Settling Time to 1% of Final value
Turn-On Transient
Start-Up Time, From On/Off Control
Start-Up Time, From Input
Maximum Output Capacitance
EFFICIENCY
100% Load
ISOLATION CHARACTERISTICS
Isolation Voltage
Isolation Resistance
Isolation Capacitance
FEATURE CHARACTERISTICS
Switching Frequency
ON/OFF Control, (Logic Low-Module ON)
Logic Low
Logic High
ON/OFF Current
Leakage Current
Output Voltage Trim Range
Output Over-Voltage Protection(Hiccup)
GENERAL SPECIFICATIONS
MTBF
Weight
Over-Temperature Shutdown
NOTES and CONDITIONS
100ms
Refer to Figure 18 for measuring point
1 minute
100% Load, 36Vin
P-P thru 12µH inductor, 5Hz to 20MHz
120 Hz
Vin=48V, Io=50%Io.max, Ta=25℃
Io=Io,min to Io,max
Vin=36V to75V
Ta=-40C to 85C
Over sample load, line and temperature
5Hz to 20MHz bandwidth
Full Load, 1µF ceramic, 10µF tantalum
Full Load, 1µF ceramic, 10µF tantalum
Output Voltage 10% Low
48V, 10µF Tan & 1µF Ceramic load cap, 0.1A/µs
50% Io,max to 75% Io,max
75% Io,max to 50% Io.max
Full load; 5% overshoot of Vout at startup
Von/off at Ion/off=1.0mA
Von/off at Ion/off=0.0 µA
Ion/off at Von/off=0.0V
Logic High, Von/off=15V
Across Trim Pin & +Vo or –Vo, Pout≦max rated
Over full temp range; % of nominal Vout
Io=80% of Io, max; Tc=40°C
Refer to Figure 18 for measuring point
S48SA1R812NRFA
Min. Typ. Max. Units
Vdc
-40
-55
1500
36 48
100
100
125
75
Vdc
°C
°C
Vdc
V
32.5 34 35.5 V
30.5 32 33.5 V
1 2 3 V
1.73
0
30
7
0.01
5
50
0.85 A mA mA
A 2 s mA dB
1.77 1.80 1.83 V
0
13.2
86
1500
10
±2
±2
100
30
5
15.6
35
35
200
6
6
88
1500
330
±10
±5
300
1.87
75
20
12
18
100
100
12
12
2200
0.8
15
1
50 mV mV ppm/℃
V mV mV
A
A mV mV
µs ms ms
µF
%
V
MΩ pF kHz
V
V mA uA
-10
115 125
6.29
+10
140
%
%
M hours
115 °C
2
DS_S48SA1R812_06012006
ELECTRICAL CHARACTERISTICS CURVES
95
4.0
90 3.5
85 3.0
80 2.5
75
2.0
70
1.5
65
60
36Vin
48Vin
75Vin
1.0
36Vin
48Vin
75Vin
0.5
55
1 2 3 4 5 6 7 8 9 10 11 12
OUTPUT CURRENT (A)
0.0
1 2 3 4 5 6 7 8 9 10 11 12
OUTPUT CURRENT (A)
Figure 1:
Efficiency vs. load current for minimum, nominal, and
Figure maximum input voltage at 25 ° C.
nominal, and maximum input voltage at 25 ° C.
0.8
0.7
Io=12A
Io=7.2A
Io=1.2A
0.6
0.5
0.4
0.3
0.2
0.1
0.0
30 35 40 45 50 55 60 65 70 75
INPUT VOLT AGE (V)
Figure 3: Typical input characteristics at room temperature. Figure Turn-on transient at full rated load current (1 ms/div).
Top Trace: Vout (500mV/div); Bottom Trace: ON/OFF Control
(5V/div).
3
DS_S48SA1R812_06012006
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). current (50%-75% of Io, max; di/dt = 0.1A/µs). Load cap: 10µF,
100 m Ω ESR 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 Figure 8: Test set-up diagram showing measurement points current (75%-50% of Io, max; di/dt = 0.1A/µs). Load cap:
10µF, 100 m Ω ESR tantalum capacitor and 1µF ceramic for Input Reflected Ripple Current (Figure 9).
Note: Measured input reflected-ripple current with a simulated capacitor. Top Trace: Vout (50mV/div), Bottom Trace: Iout
5A/div).
source Inductance (L
TEST
) of 12 µH. Capacitor Cs offset possible battery impedance.
4
DS_S48SA1R812_06012006
ELECTRICAL CHARACTERISTICS CURVES
Vo(+)
Vo(-)
Copper Strip
10u 1u
SCOPE RESISTIVE
LOAD
Figure 9 :
Input Reflected Ripple Current, is, at full rated output current and nominal input voltage with 12 µ H source impedance and 33 µ F electrolytic capacitor (2 mA/div).
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.
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: 1 µ F ceramic capacitor and 10 µ F tantalum capacitor. Bandwidth: 20 MHz.
Figure 12: Output voltage vs. load current showing typical current limit curves and converter shutdown points.
5
DS_S48SA1R812_06012006
DESIGN CONSIDERATION
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.
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. these issues are pending release.
Application notes to assist designers in addressing
Safety Considerations
The power module must be installed in compliance with the spacing and separation requirements of the enduser’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.
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.
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.
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.
6
DS_S48SA1R812_06012006
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 (hiccup mode).
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.
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 overvoltage 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.
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.
The module will try to restart after shutdown. If the overtemperature condition still exists during restart, the module will shut down again. This restart trial will continue until the temperature is within specification.
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 to floating.
Sense(-)
Vi(-) Vo(-)
Contact
Resistance
Figure 14: E ffective circuit configuration for remote sense operation
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.
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.
Care should be taken to ensure that the maximum output power does not exceed the maximum rated power.
7
DS_S48SA1R812_06012006
Vi(+) Vo(+)
Sense(+)
ON/OFF
Sense(-)
Vi(-) Vo(-)
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:
[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).
Vi(+) Vo(+)
Sense(+)
O utput Voltage Adjustment (TRIM)
T o 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.
Rtrim
−
up
=
23 .
8 ( 100
+ ∆
Vo
∆
Vo
%
%)
−
1089
−
104
[ ]
Ex. When trim-up +10% (1.8V X 1.1 = 1.98V)
Rtrim
−
up
=
23 .
8 ( 100
+
10
10
)
−
1089
−
104
=
48 .
9
C are 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:
Rtrim
−
down
=
1089
∆
Vo
%
−
104
[ ]
E x. When trim-down –10% (1.8V X 0.9 = 1.62V)
Rtrim
−
down
=
1089
10
−
104
=
4 .
9
[ ]
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:
DS_S48SA1R812_06012006
8
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. 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.
FACING PWB PWB
MODULE
THERMAL CURVES
12
10
8
6
4
2
Natural
Convection
100LFM
200LFM
300LFM
400LFM
0
65 70 75 80 85 90 95 100
Ambient Temperature (℃)
Figure 19: Output current vs. ambient temperature and air velocity
@V in
< 60 V
AIR VELOCITY
AND AMBIENT
TEMPERATURE
MEASURED BELOW
THE MODULE 50.8 (2.0”)
Figure 18: Hot spot temperature measured point
＊ The allowed maximum hot spot temperature is defined at
110 ℃
14
Output Current(A)
S48SA1R812(Standard) Output Current vs. Ambient Temperature and Air Velocity
@ Vin < 60V
600LFM
500LFM
AIR FLOW
10 (0.4”)
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
Figure 17:
Wind tunnel test setup
9
DS_S48SA1R812_06012006
PICK AND PLACE LOCATION SURFACE-MOUNT TAPE & REEL
RECOMMENDED PAD LAYOUT (SMD)
10
DS_S48SA1R812_06012006
LEADED (Sn/Pb) PROCESS RECOMMEND TEMP. PROFILE
250
200
2nd Ramp-up temp.
1.0~3.0°C /sec.
Peak temp.
210~230°C 5sec.
Pre-heat temp.
140~180°C 60~120 sec.
Cooling down rate <3°C /sec.
150
Ramp-up temp.
0.5~3.0°C /sec.
100
Over 200°C
40~50sec.
50
60
Time ( sec. )
180
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.
150℃
Preheat time
100~140 sec.
Time Limited 90 sec.
above 217℃
Ramp up
max. 3℃/sec.
25℃
Time
Note: The temperature refers to the pin of S48SA, measured on the pin +Vout joint.
DS_S48SA1R812_06012006
11
MECHANICAL DRAWING
SMD Through-Hole
Pin No.
1
2
6
Name
+Vout
-Vout
Trim
8 ON/OFF
11 -Vin
12 +Vin
Optional Pin Name
4 +Sense (Option)
5
9
-Sense (Option)
NC
Function
Positive output voltage
Negative output voltage
Output voltage trim
Negative input voltage
Positive input voltage
Function
Positive sense pin
Negative sense pin
No connection
DS_S48SA1R812_06012006
12
PART NUMBERING SYSTEM
S 48 S A 1R8 12 N R F
Form Input Number of Product Output Output
Factor Voltage Outputs Series Voltage Current
S- Small
Power
48V S- Single A- Advanced 1R2-1.2V
1R5-1.5V
1R8-1.8V
2R5-2.5V
3R3- 3.3V
050- 5.0V
120- 12V
03- 3.0V
06- 6.6A
10- 10A
12- 12A
* 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.
ON/OFF
Logic
N- Negative
P- Positive
Pin Type
R- SMD
T-Through hole
F- RoHS 6/6
(Lead Free)
MODEL LIST
A*
Option
Code
A- 9 pin, no sense
B- 6 pin, no sense
C- 9 pins with sense
(12V has option B only)
MODEL NAME INPUT OUTPUT EFF @ 100% LOAD
84.0%
88.0%
88.0%
88.5%
90.5%
90.5%
90.0%
CONTACT: www.delta.com.tw/dcdc
USA:
Telephone:
East Coast: (888) 335 8201
West Coast: (888) 335 8208
Fax: (978) 656 3964
Email: [email protected]
Europe:
Phone: +41 31 998 53 11
Fax: +41 31 998 53 53
Email: [email protected]
Asia & the rest of world:
Telephone: +886 3 4526107 ext 6220
Fax: +886 3 4513485
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.
DS_S48SA1R812_06012006
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