DC/DC 转换器中电阻式反馈分压器设计考虑因素

DC DC 转换器中电阻式反馈分压器设计考虑因素Power Management

Texas Instruments Incorporated

Design considerations for a resistive DC/DC feedback divider in a DC/DC converter
ǖ Darwin Fernandez (TI) By Darwin Fernandez Applications Engineer

Introduction
The resistive divider is the most common network in any DC/DC DC/DC converter’s feedback system. However, it is often misjudged as a circuit that simply sets the output voltage by scaling it down to a reference voltage. After computing the proper divider ratio, power-supply designers must make careful considerations when choosing the actual resistance values because they influence the overall performance of the converter. This article discusses the design consider ations for the resistive divider in a feedback system and how the divider affects a converter’s efficiency,