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UCC27211问题

HB,HS接0.47uf电容,HO输出接4ohm电阻,输入100khz信号接HI,LI,示波器测HO和HS间没有信号;而LO和VSS间有信号

这是为什么,芯片应该没问题,换过一次了已经,还是不行