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TPS65261使用问题



5V输入,刚开始工作,三路分别输出1.2V 2.5V 3.3V正常工作,一分钟左右,第二路输出变为4V,测量RESET信号为5V,三路EN为2.5V,请问这是什么原因?MODE拉高为5V,采用的是自动上电模式,三路EN悬空。