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L36SA05010NRFA Datasheet(PDF) 11 Page - Delta Electronics, Inc. |
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L36SA05010NRFA 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’’). 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 20: Wind tunnel test setup Thermal Derating Heat can be removed by increasing airflow over the module. 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 21: Hot spot temperature measured point * The allowed maximum hot spot temperature is defined at 130 ℃ L36SA12004(standard) Output Current vs. Ambient Temperature and Air Velocity @Vin = 48V (Either Orientation) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 30 35 40 45 50 55 60 65 70 75 80 85 Natural Convection 200LFM 400LFM 300LFM 100LFM Output Current (A) Ambient Temperature (℃) 500LFM Figure 22: Output current vs. ambient temperature and air velocity @Vin=48V (Either Orientation) DS_L36SA12004_02142007 11 |
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