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DW025CC-M Datasheet(PDF) 13 Page - General Semiconductor |
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DW025CC-M Datasheet(HTML) 13 Page - General Semiconductor |
13 / 20 page Lineage Power 13 Data Sheet April 2008 36 Vdc to 75 Vdc Input; Dual Outputs; 25 W DW025 Dual Output-Series Power Modules: dc-dc Converters; Thermal Considerations (continued) Basic Thermal Performance The DW025-Series Dual Output Power Modules have a separate power stage for each of the outputs. This means that the maximum operating temperature can be predicted quite closely by treating each output indi- vidually and then summing the results. Figures 16 through 21 are used to predict the safe operating con- dition for many different operating and environmental conditions. The method used to determine the maximum ambient temperature at a given air velocity is a four-step pro- cess. 1. Find the power dissipated for output 1 by using the appropriate chart (Figures 16 through 19) for a par- ticular output condition (IO1). 2. Repeat step 1 for output 2 using Figures 16 through 19. 3. Find the total power dissipated by summing the power dissipated on each of the outputs: (PDOUT1 + PDOUT2) = PDtotal 4. Use the total power dissipated with Figure 20 to determine the maximum ambient temperature at dif- ferent air velocities. For example, the DW025AF-M power module operating at full load on both outputs with 54 V input has a power dissipation of 3.6 W (from Figure 17) plus 3.1 W (from Figure 16) for a total of 6.7 W. Using Figure 20, it can be determined that the maximum ambient temperature at natural convection that the DW025AF-M can operate at is approximately 56 °C. Keep in mind that these are approximations of the tem- peratures and airflows required to keep the case tem- perature below its maximum rating. The maximum case temperature at the point shown in Figure 15 must be kept at 100 °C or less. Air Velocity The air velocity required to maintain a desired maxi- mum case temperature for a given power dissipation and ambient temperature can be calculated using Figure 21 and the following equation: θCA = where θCA is the thermal resistance from case-to-ambi- ent air (°C/W), TC, max is the desired maximum case temperature (°C), TA is the ambient inlet temperature (°C), and PDtotal is the total power dissipated from the module (W). For example, to maintain a maximum case temperature of 85 °C with an ambient inlet temperature of 55 °C and a power dissipation of 6.7 W, the thermal resistance is: θCA ≤ = 4.5 °C/W This corresponds to an air velocity greater than 0.46 ms–1 (90 fpm) in Figure 21. TC max , TA – PDtotal -------------------------------- 85 °C 55 °C – 6.7 W ------------------------------------ |
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