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FEATURES
High efficiency: 93.2% @ 12V/ 25A
Standard footprint: 58.4 x 61.0 x 11.2 mm
(2.30” x2.40”x0.44”)
Industry standard pin out
Single board construction
Fixed frequency operation
2250V Isolation
Basic insulation
Monotonic startup into normal and pre-
bias loads
Fully protected: input UVLO, output OVP,
OCP, OTP
No minimum load required
Wide output trim range: -20%, +10%
ISO 9001, TL 9000, ISO 14001, QS
9000, OHSAS 18001 certified
manufacturing facility
UL/cUL 6
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TECHNICAL SPECIFICATIONS (T =25°C, airflow rate=300 LFM, V =48Vdc, nominal Vout unless otherwise noted.) A in NOTES and CONDITIONS H48SA12025 (Standard) PARAMETER Min. Typ. Max. Units ABSOLUTE MAXIMUM RATINGS Input Voltage Continuous 80 Vdc Transient (100ms) 100ms 100 Vdc Operating Device Temperature(Openframe) Please refer to fig24. for the measuring point -40 122 °C Operating Device Temperature(Heatspreader) Please refer to fig25. for the measuring point -40 1
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ELECTRICAL CHARACTERISTICS CURVES 95 30 90 25 75Vin 75Vin 85 48Vin 20 48Vin 36Vin 80 36Vin 15 75 10 70 5 65 60 0 5 10152025 0 5 10 15 20 25 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. Vout=12V. nominal, and maximum input voltage at 25°C. Vout=12V. 95 30 90 25 75Vin 85 75Vin 48Vin 20 48Vin 36Vin 80 36Vin 15 75 10 70 5 65 0 60 0 5 10 15
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ELECTRICAL CHARACTERISTICS CURVES 95 30 90 25 75Vin 75Vin 85 48Vin 20 48Vin 36Vin 80 36Vin 15 75 10 70 5 65 0 60 0 5 10 15 20 25 5 10152025 OUTPUT CURRENT (A) OUTPUT CURRENT (A) Figure 5: Efficiency vs. output voltage for minimum, nominal, Figure 6: Power dissipation vs. output voltage for minimum, and maximum input voltage at 25°C, Vout= 13.2V. nominal, and maximum input voltage at 25°C, Vout= 13.2V. 12 10 8 0 6 4 0 2 0 30.0 31.3 33.6 35.0 40.0 45.0 50.0 55.0 60.0 65.0 70.0 75.0
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ELECTRICAL CHARACTERISTICS CURVES 0 0 0 Figure 9: Turn-on transient at zero load current, 4 ms/div; Figure 10: Output voltage response to step-change in load Top Trace: Vout, 5V/div; Bottom Trace: ON/OFF input, current, 200mV/div, 200us/div. 75%-50%-75% of Io, max, di/dt = A/µs. Load cap: 10µF, tantalum capacitor and 1µF ceramic 5V/div. 0.1 capacitor. Scope measurement should be made using a BNC cable (length shorter than 20 inches). Position the load between 51 mm to 76 mm (2 in
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ELECTRICAL CHARACTERISTICS CURVES 0 0 Figure 13: Input Terminal Ripple Current, i , at nominal input Figure 14: Input reflected ripple current, i , through a 12µH c s voltage and rated load current with 12µH source impedance source inductor at nominal input voltage and rated load current, and 100µF electrolytic capacitor, 500 mA/div, 2us/div. 20 mA/div, 2us/div. Copper Strip Vo(+) SCOPE RESISTIVE 10u 1u LOAD 0 Vo(-) Figure 15: Output voltage noise and ripple measurement Figure
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DESIGN CONSIDERATIONS Safety Considerations Input Source Impedance The power module must be installed in compliance with the spacing and separation requirements of the end- The impedance of the input source connecting to the user’s safety agency standard, i.e., UL60950, DC/DC power modules will interact with the modules CAN/CSA-C22.2 No. 60950-00 and EN60950:2000 and and affect the stability. A low ac-impedance input IEC60950-1999, if the system in which the power source is recom
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FEATURES DESCRIPTIONS Remote on/off can be controlled by an external switch Over-Current Protection between the on/off terminal and the Vi(-) terminal. The switch can be an open collector or open drain. The modules include an internal output over-current protection circuit. If the output current exceeds the OCP Vi Vi( (+ +) ) Vo( Vo(+ +) ) set point, the modules will automatically shut down, and enter hiccup mode or latch mode, which is optional. Se Sense( nse(+ +) ) ON ON/O
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FEATURES DESCRIPTIONS (CON.) 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 SENSE(+) or SENSE(-). The TRIM pin should be left open if this feature is not used. Figure 21: Circuit configuration for trim-down (decrease output voltage) If the external resistor is connected between the TRIM and SENSE (-) the output voltage set point decreases (
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THERMAL CONSIDERATIONS Thermal Derating Thermal management is an important part of the system design. To ensure proper, reliable operation, Heat can be removed by increasing airflow over the sufficient cooling of the power module is needed over module. The module’s maximum device temperature is to the entire temperature range of the module. Convection be defined and the measured location is illustrated in cooling is usually the dominant mode of heat transfer. Figure 24. To en
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THERMAL CURVES H48SA12025(Standard) Output Current vs. Ambient Temperature and Air Velocity @Vin = 48V (Either Orientation) Output Current (A) 600LFM 25 500LFM 20 Natural Convection 15 100LFM 200LFM 10 300LFM 5 400LFM 0 25 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature ( ℃) Figure 26: Output current vs. ambient temperature and air Figure 24: Temperature measurement location for openframe velocity @ V =48V, Vout=12V(Openframe Version, Either in version - T
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MECHANICAL DRAWING (WITHOUT HEATSPREADER) Pin No. Name Function 1 +Vin Positive input voltage 2 ON/OFF Remote ON/OFF 3 CASE Case pin 4 -Vin Negative input voltage 5 -Vout Negative output voltage 6 -SENSE Negative remote sense 7 TRIM Output voltage trim 8 +SENSE Positive remote sense 9 +Vout Positive output voltage Notes: Pins 1-4, 6-8 are 1.00mm (0.040”) diameter 1 Pins 5 and 9 are 2.00mm (0.079”) diameter 2 All pins are copper with Tin plating. 3 12 DS_H48SA12025
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MECHANICAL DRAWING (WITH HEATSPREADER) 13 DS_H48SA12025_05052008
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PART NUMBERING SYSTEM H 48 S A 120 25 N N F A Form Input Number of Product Output Output ON/OFF Pin Option Code Factor Voltage Outputs Series Voltage Current Logic Length H - Half- 48V S- Single A - Advanced 120- 12V 25- 25A N - Negative N - 0.145” A - Standard Functions F- RoHS 6/6 Brick P - Positive H - with Heatspreader (Lead Free) MODEL LIST Part Number INPUT OUTPUT EFF @ 100% LOAD H48SA12025NNFA 36V~75V 11A 12V 25A 93.2% CON
