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TPS65217C LOD1无输出电压

       新焊的TPS65217C板子,原理图是参照数据手册画的,LDO与DCDC 输入电压均由SYS引脚提供,PWR_EN脚通过一个上拉电阻与LDO1相连。使用USB供电时,SYS引脚无电压输出,LDO1无输出电压,使用单节锂电池供电时,SYS引脚输出3.6V,LDO1脚无输出电压。