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H48SA53010 Datasheet(PDF) 10 Page - Delta Electronics, Inc. |
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H48SA53010 Datasheet(HTML) 10 Page - Delta Electronics, Inc. |
10 / 13 page DS_H48SA53010_10212014 10 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 is constantly kept at 6.35mm (0.25’’). Thermal De-rating Heat can be removed by increasing airflow over the module. The module ’s maximum device temperature is to be defined and the measured location is illustrated in Figure 19. 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. Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches) 12.7 (0.5”) MODULE AIR FLOW 50.8 (2.0”) FACING PWB PWB AIR VELOCITY AND AMBIENT TEMPERATURE MEASURED BELOW THE MODULE Figure 19: Wind tunnel test setup THERMAL CURVES (WITH HEATSPREADER) Figure 20: Temperature measurement location * The allowed maximum hot spot temperature is defined at 108 ℃ H48SA53010(Standard) Output Power vs. Ambient Temperature and Air Velocity @Vin = 48V (Either Orientation,With Heatspreader) 0 50 100 150 200 250 300 350 400 450 500 550 25 30 35 40 45 50 55 60 65 70 75 80 85 Natural Convection 100LFM 300LFM 200LFM Ambient Temperature (℃) Output Power (W) 600LFM 500LFM 400LFM Figure 21: Output Power vs. ambient temperature and air velocity @ Vin=48V, Vout=54V (Either Orientation) |
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