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tps65217 ldo输出无电压



工程师你好:

我们根据bbb板子画了一个核心板,pmic65217上电后,sys5v输出保持5v,2s后被拉低到2.5v左右

ldo1 输出1.8v,1s左右被拉低到0v

dcdc1输出时有时无,其他的ldo均无输出

请问这个问题是什么引起的?

请帮忙分析