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Q48SA52001NRFA Datasheet(PDF) 9 Page - Delta Electronics, Inc. |
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Q48SA52001NRFA Datasheet(HTML) 9 Page - Delta Electronics, Inc. |
9 / 12 page DS_Q48SA52001_05142009 9 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 18: 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. Figure 17: Circuit configuration for trim-down (decrease output voltage) If the external resistor is connected between the TRIM and Vo(+), Vout decreases (Fig. 18). The external resistor value required to obtain output voltage change △ U is defined as: ) ( 7 . 55 51 * 51 Ω − Δ = − K U R down trim Ex. When Trim-down 15%, U △ is 15%*Vnormal=0.15*52.5=7.875 ) ( 6 . 274 7 . 55 875 . 7 51 * 51 Ω = − = − K R down trim When using trim-up, the output voltage of the module is usually increased, which increases the power output of the module with the same output current.Care should be taken to ensure that the maximum output power of the module remains at or below the maximum rated power. |
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