使用TPS5430做了12V转5V的电路设计,目前EN高电平时,芯片可以正常输出5V电压。EN低电平时,却关闭不了。

EN=0时,输出波形和PH波形如下


我的layout 感觉也没问题

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Hi
从你描述看,EN功能失效,看起来是芯片问题,有没有更换芯片确认?
另外请问你的芯片哪里买的?