避免通过最小化电源单端输出，D 类音频放大器上抽过电压应力

摘要： 本应用指南解释什么电源抽以及如何出现在雇用单端输出负载的 D 类音频放大器的设计中。本文将缓解问题的三个设计解决方案。数学方程表明，使用大于 1000µF 电源电容器的大大减少的现象。MAX9742 D 类放大器用作设计示例。
Maxim > App Notes > Audio Circuits
Keywords: power supply pumping, Class D, single ended, audio amplifier Apr 16, 2010

APPLICATION NOTE 4260
Avoid Overvoltage Stresses by Minimizing Power-Supply Pumping on
Single-Ended Output, Class D Audio Amplifiers


Abstract:This application note explains what power-supply pumping is and how it occurs in designs that employ a Class D audio
amplifier with single-ended output loads. The article presents three design solutions that will reduce the problem. Mathematical
equations show that use of power-supply capacitors greater than 1000F greatly reduce the phenomenon. The MAX9742 Class
D amplifier serves as design example.

This app note is based on a similar article that was published in April 2009 on the