率MOSFET是便携式设备中大功率开关电源的主要组成部分。此外，对于散热量极低的笔记本电脑来说，这些MOSFET是最难确定的元件。本文给出了计算MOSFET功耗以及确定其工作温度的步骤，并通过多相、同步整流、降压型CPU核电源中一个30A单相的分布计算示例，详细说明了上述概念。 Maxim > App Notes > POWER-SUPPLY CIRCUITS PROTOTYPING AND PC BOARD LAYOUT Keywords: power dissipation, resistive loss, switching loss, power MOSFETs Dec 26, 2002 APPLICATION NOTE 1832 Power Supply Engineer's Guide to Calculate Dissipation for MOSFETs in High-Power Supplies Abstract: Power MOSFETs are an integral part of any high-power-switching power supplies used in portable devices. Additionally, these MOSFETs are difficult components to specify for notebook products with minimal heat dissipation capabilities. 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 ……