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TPS65217C 工作不正常

Other Parts Discussed in Thread: AM3352

PMIC:TPS65217C

CPU: AM3352

参考电路是BB BLACK的。

问题描述如下:

1.  TPS65217C  AC 输入+5V;

2. TPS65217C SYS  上电50ms后为5V,维持 60ms后变为1.12V,并持续输出1.12v不变

3.TPS65217C  LDO4上电后为0.73V,106ms后变为1.6V,4ms后变为0.73V并持续不变

TPS65217C 其他输出上电106ms后输出正常,4ms后变为0