文中对不同拓扑结构SMPS 的基本工作原理进行了介绍，并详细讨论了不同结构的应用和优缺点。该应用笔记将指导用户如何针对特定应用选择合适的拓扑结构，并提供了如何为给定的SMPS 设计选择合适的电气电子元器件的有用信息-The basic working principle of different SMPS topologies are introduced and discussed in detail the applications and the advantages and disadvantages of the different structures. This application note will guide the user to select an appropriate topology for specific applications, and provides useful information on how to select the appropriate electrical and electronic components for a given SMPS design