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TPS65217C的SYS无输出。

Other Parts Discussed in Thread: AM3354

   做了一个AM3354平台的板子,电源芯片为TPS65217C,现在电源无输出,SYS电压为1.37V。LDO1电压为0V。想问一下AC/USB输入端到SYS之间的MOSFET开启条件是什么?是插入AC/USB后SYS就应该有?