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TPS61178: 上电烧毁

Part Number: TPS61178

如上图所示:

VIN=12~17.6V

VOUT=19.2V

当我的TPS61178正常工作,在TO_LINK_DCIN端加20V,就会导致IC烧毁,请问这是什么原因?我要怎么避免,谢谢!