大功率电源中MOSFET功耗的计算

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