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TPS65217C 给AM3359 供电问题

Other Parts Discussed in Thread: AM3359

PMIC:TPS65217C

CPU: AM3359 ZEC

参考电路是BB Board的。

问题描述如下:

1. TPS56217C AC 输入+5V;

2. TPS65217C SYS 输出在2.5V 和5V两个数值之间跳动;跳动周期约5s(是否和该芯片Time out时间吻合?)

3.测量INT_LDO、BYPASS引脚电压均正常。

4.测量LDO1输出正常。

其他电路工作不正常。

什么导致了SYS 输出变化?