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TPS2419: tps2419 外部 nmos无法关断

Part Number: TPS2419

dear

在使用tps2419做防反设计时候,断开输入,发现GATE脚始终是高电平23v左右,也就是说mos始终导通。请问这是什么原因?原理图和PCB分别如下,谢谢