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pth08t230芯片故障



板子使用了pth08t230芯片,输出1.2V,输入5V,已使用很久,一直没问题,最近一比板子出现输出无电压,更换新芯片就好了,请问有什么原因可致电压输出故障?

输出端负载正常。

谢谢