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关于tps65217C断电问题

Other Parts Discussed in Thread: AM3358, TPS65217

tps65217和AM3358一起使用,板子已经正常工作,所有外设都正常。问题是板子在工作十几分钟或更长时间后,SYS管脚会有一个向下的脉冲,使设备从新运行,电路中AC和usb同时供电时没有上述问题,但usb接头没有插上USB线时会出现上面问题。请帮助分析一下问题,谢谢!