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UCC28061为什么不启动?

Other Parts Discussed in Thread: UCC28061

我的UCC28061怎么不启动,但是奇怪的是当我强电(AC)输入从0慢慢增加的时候大概到80V左右,有时候芯片能启动,有时候却不能。大家有碰到这样的问题过么?