App note: Calculating power dissipation of MOSFETs used in high-power switching supplies
Here’s an app note from Maxim describing how to calculate power dissipation of MOSFETs used in high-power switching supplies. The article is focused on CPU power supplies which operate at lower voltages (0.9-1.75v) but require loads of current (+60A).
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This article provides step-by-step instructions for calculating the power dissipation of these MOSFETs and determining the temperature at which they operate. It then illustrates these concepts by stepping through the design of one 30A phase of a multiphase, synchronous-rectified, step-down CPU core supply.