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E36SR12005PRFA Datasheet(PDF) 10 Page - Delta Electronics, Inc. |
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E36SR12005PRFA Datasheet(HTML) 10 Page - Delta Electronics, Inc. |
10 / 14 page DS_E36SR12005_09162013 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’’). AIR F LOW MODULE PWB AIR VELOCITY AND AMBIENT TEMPERATURE SURED BELOW THE MODULE FANCING PWB Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches) Figure 19: 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 (WITHOUT HEAT SPREADER) AIRFLOW HOT SPOT 1 NTC RESISTOR Figure 20: * Hot spot 1& NTC resistor temperature measured points. The allowed maximum hot spot 1 temperature is defined at 121 ℃. E36SR12005(Standard) Out put Current vs. Ambient Temperat ureand Air Velocit y @Vin= 24V (Transverse Orientation) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 25 3 0 3 5 4 0 4 5 5 0 55 60 65 70 75 80 85 Amb ie nt Te mperat ure ( ℃) Output Cu rrent (A) Nat ural Convection 10 0L FM 200L F M Figure 21: Output current vs. ambient temperature and air velocity @Vin=24V (Transverse orientation, airflow from Vin- to Vin+, without heat spreader) E36SR12005(Standard) Out put Current vs. Ambient Temperat ureand Air Velocit y @Vin= 48V (Transverse Orientation) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 25 3 0 3 5 4 0 4 5 5 0 55 60 65 70 75 80 85 Amb ie nt Te mperat ure ( ℃) Output Cu rrent (A) Natural Convection 10 0L FM 200L F M 300 LF M 40 0L FM 500 LF M Figure 22: Output current vs. ambient temperature and air velocity @Vin=48V (Transverse orientation, airflow from Vin- to Vin+, without heat spreader) |
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