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FEATURES
High Efficiency: 91.0% @ 28V/12.5A
Size: 61.0x57.9x12.7mm (2.40”×2.28”×0.50”)
Standard footprint
Industry standard pin out
Fixed frequency operation
Metal baseplate
Input UVLO, Output OCP, OVP, OTP
Basic insulation
2250V isolation
2:1 Input voltage range
ISO 9001, TL 9000, ISO 14001, QS9000,
OHSAS18001 certified manufacturing facility
UL/cUL 60950-1 (US & Canada) recognized,
and TUV (EN60950-1) certified
CE mark meets 73/23/EEC and 93/68/EEC
directiv
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TECHNICAL SPECIFICATIONS (T =25°C, airflow rate=600 LFM, V =48Vdc, nominal Vout unless otherwise noted.) A in PARAMETER NOTES and CONDITIONS H48SN28012 (Standard) Min. Typ. Max. Units ABSOLUTE MAXIMUM RATINGS Input Voltage Continuous 80 Vdc Transient (100ms) 100ms 100 Vdc Operating Temperature Please refer to Fig.21 for measuring point -40 110 °C Storage Temperature -55 125 °C Input/Output Isolation Voltage 2250 Vdc INPUT CHARACTERISTICS Operating Input Vo
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ELECTRICAL CHARACTERISTICS CURVES 45.0 95 36Vin 48Vin 75Vin 36Vin 48Vin 75Vin 40.0 90 35.0 30.0 85 25.0 20.0 80 15.0 75 10.0 5.0 70 02 4 6 8 10 12 14 0.0 OUTPUT CURRENT (A) 02 46 8 10 12 14 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. 14.0 Io=12.5A Io=7.5A Io=1.25A 12.0 10.0 8.0 6.0 4.0 2.0 0.0 30 35 40 45 50 55 60 65 70 7
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ELECTRICAL CHARACTERISTICS CURVES For Negative Remote On/Off Logic Figure 4: Turn-on transient at full rated load current (resistive Figure 5: Turn-on transient at minimum load current load) (10ms/div). CH3: Vout;5V/div; CH1: ON/OFF input: 2V/div (10ms/div). CH3: Vout: 5V/div; CH1: ON/OFF input: 2V/div For Positive Remote On/Off Logic Figure 6: Turn-on transient at full rated load current (resistive Figure 7: Turn-on transient at zero load current (10ms/div). Top load) (10ms/div). Top
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ELECTRICAL CHARACTERISTICS CURVES Figure 8: Output voltage response to step-change in load Figure 9: Output voltage response to step-change in load current (75%-50% of Io, max; di/dt = 1A/10µS). Load cap: current (50%-75% of Io, max; di/dt = 1A/10µS). Load cap: 330µF aluminum,10uF Low ESR capacitor and 1µF ceramic 330µF aluminum,10uF Low ESR capacitor and 1µF ceramic capacitor. Top Trace: Vout (100mV/div), Bottom Trace: Iout capacitor. Top Trace: Vout (100mV/div), Bottom Trace: Iout (5A/di
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ELECTRICAL CHARACTERISTICS CURVES Figure 11: Input Terminal Ripple Current, i , at full rated output Figure 12: Input reflected ripple current, i , through a 12µH c s current and nominal input voltage with 12µH source impedance source inductor at nominal input voltage and rated load current and 220µF electrolytic capacitor (1A/div). (10 mA/div) Copper Strip Vo(+) SCOPE RESISTIVE 10u 1u LOAD Vo(-) Figure 13: Output voltage noise and ripple measurement test setup H48SN28012_011720
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ELECTRICAL CHARACTERISTICS CURVES 30.0 25.0 20.0 15.0 10.0 5.0 Vin=48V 0.0 02468 10 12 14 16 18 20 LOAD CURRENT (A) Figure 14: Output voltage ripple at nominal input voltage and Figure 15: Output voltage vs. load current showing typical rated load current (20 mV/div). Load capacitance:330uF current limit curves and converter shutdown points. aluminum, 1µF ceramic capacitor and 10µFlow ESR capacitor. Bandwidth: 20 MHz. Scope measurement should be made using a BNC cable (length shorter than
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DESIGN CONSIDERATIONS Input Source Impedance The input source must be insulated from the ac The impedance of the input source connecting to the mains by reinforced or double insulation. DC/DC power modules will interact with the modules and affect the stability. A low ac-impedance input source The input terminals of the module are not operator is recommended. If the source inductance is more than accessible. a few μH, we advise adding a 220 to 470 μF electrolytic cap
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FEATURES DESCRIPTIONS Vi(+) Vo(+) Over-Current Protection Sense(+) The modules include an internal output over-current ON/OFF protection circuit, which will endure current limiting for Sense(-) an unlimited duration during output overload. If the output current exceeds the OCP set point, the modules Vi(-) Vo(-) 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 Figure 16:
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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 19: Circuit configuration for trim-up (increase output voltage) If the external resistor is connected between the TRIM and SENSE (+) the output voltage set point increases (Fi
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THERMAL CONSIDERATIONS Thermal management is an important part of the system Thermal Derating design. To ensure proper, reliable operation, sufficient cooling of the power module is needed over the entire Heat can be removed by increasing airflow over the module. temperature range of the module. Convection cooling is The module’s maximum case temperature is 110℃. To usually the dominant mode of heat transfer. enhance system reliability, the power module should always be operated b
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MECHANICAL DRAWING Pin No. Name Function 1 -Vin Negative input voltage 2 CASE Case ground 3 ON/OFF Remote ON/OFF 4 +Vin Positive input voltage 5 +Vout Positive output voltage 6 +SENSE Positive remote sense 7 TRIM Output voltage trim 8 -SENSE Negative remote sense 9 -Vout Negative output voltage Pin Specification: Pins 1-4, 6-8 1.00mm (0.040”) diameter Pins 5 & 9 2.00mm (0.079”) diameter All pins are copper with Tin plating. H48SN28012_01172008 12
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PART NUMBERING SYSTEM 12 H 48 S N 280 N R F A Form Input Number of Product Output Output ON/OFF Pin Option Code Factor Voltage Outputs Series Voltage Current Logic Length F- RoHS 6/6 H- Half 48V S- Single N- 350W 280- 28V 12- 12.5A N- Negative R- 0.170” A - Standard Brick series P- Positive N- 0.145” (Lead Free) Functions K- 0.110” Space - RoHS B - no thread 5/6 heatsink mounting hole MODEL LIST MODEL NAME INPUT OUTPUT EFF @ 100% LOAD 91% H48SN28012NRFA 36V~75V 12.5A 28V 12.5A
