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H24SN28029PRFA Datasheet(PDF) 11 Page - Delta Electronics, Inc. |
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H24SN28029PRFA Datasheet(HTML) 11 Page - Delta Electronics, Inc. |
11 / 13 page 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 Derating Heat can be removed by increasing airflow over the module. The module’s maximum case temperature is 115℃. 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. THERMAL CURVES Figure 20: Temperature measurement location The allowed maximum hot spot temperature is defined at 115 ℃ 12.7 (0.5”) MODULE AIR FLOW 50.8 (2.0”) FACING PWB PWB AIR VELOCITY AND AMBIENT TEMPERATURE MEASURED BELOW THE MODULE H24SN28012_07272006 11 Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches) 0 50 100 150 200 250 300 350 400 25 35 45 55 65 75 85 95 105 Output Power (W) Hot Spot Temperature(℃) H24SN28012NR A (Standard) Output Power vs. Hot Spot Temperature (Either Orientation) Figure 21: Output power vs. hot spot temperature (Either Orientation) Figure 19: Wind Tunnel Test Setup |
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