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UCC27714: 半桥驱动芯片驱动BUCK电路,在BUCK驱动关闭,使能端子拉低时HS脚仍然有一个电压会输出到buck输出。

Part Number: UCC27714


如图所示,BUCK调试时发现使能端拉低,HI,LI拉低后BUCK的输出端仍然有一个9V左右电压,去掉boot二极管,boot电容后电压消失。怀疑这个电压是从芯片本身输出。

BUCK输出接电池时这个电压会造成严重影响。求解决办法