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LM5085产生负压,上电后输入被拉低。

Other Parts Discussed in Thread: LM5085, LM5022, TPS54160, TPS5430

技术支持,你好。

我利用LM5085输出-40V电压,输入24V。现空载上电输入电源被拉到3.8V左右,栅极驱动也被拉到3.8V的方波。原理图如下,请教大概原因是什么?