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TPS65217B电压输出问题

Other Parts Discussed in Thread: AM3359

TPS65217B在没有焊上AM3359之前所有电压都有输出,焊上AM3359之后SYS电压有一从2.2V电压弧形降低输出到0.75V,时间持续约6秒,然后又陡升到5V,持续约30毫秒, 然后又陡降到2.2V完成一个周期。而复位脚电压则从0.3V弧形升到1V,持续时间约1秒,然后又陡降到0.3V,持续时间约5秒完成一个周期,这到底是什么原因