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DNL04S0A0S10NFD Datasheet(PDF) 11 Page - Delta Electronics, Inc. |
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DNL04S0A0S10NFD Datasheet(HTML) 11 Page - Delta Electronics, Inc. |
11 / 14 page DS_DNM10SIP10_03062009 11 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 height of this fan duct is constantly kept at 25.4mm (1’’). 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. Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches) MODULE AIR FLOW 12.7 (0.5”) 50.8 (2.0”) FACING PWB PWB AIR VELOCITY AND AMBIENT TEMPERATURE MEASURED BELOW THE MODULE 25.4 (1.0”) Figure 30: Wind tunnel test setup FEATURE DESCRIPTIONS (CON.) Ratio-Metric Ratio–metric (Figure 29) is implemented by placing the voltage divider on the TRACK pin that comprises R1 and R2, to create a proportional voltage with VoPS1 to the Track pin of PS2. For Ratio-Metric applications that need the outputs of PS1 and PS2 reach the regulation set point at the same time The following equation can be used to calculate the value of R1 and R2. The suggested value of R2 is 10kΩ. ,2 2 ,1 1 2 oPS oPS V R VR R = + R1 R2 TRACK VoPS1 PS2 VoPS2 PS1 Vin Vin On/Off On/Off The high for positive logic The low for negative logic |
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