开关电源TL431反馈回路分析

Analysis of TL431 in feedback loop of switching power supply

本文介绍了开关电源TL431反馈回路的一些基本概念和基本分析方法,从静态分析、动态分析、环路控制理论分析等几个方面分析了TL431环路的特性,并利用开关电源的小信号传递函数,通过一个具体的反激式开关电源实例对环路的动态补偿设计进行了分析和仿真,通过设计合适的相位裕量来保证开关电源的稳定性。

This paper introduced some basic concepts and analysis methods of TL431 in feedback loop of switching power supply. The article analyzed TL431 feedback circuit from the static characteristics, dynamic characteristics and control theory. By using the small signal transfer function of switching power circuit, the dynamic compensation design of TL431 feedback loop is then designed and simulated as an example. The phase margin design appropriate to ensure the stability of the switching power supply.