你好:
目前设计中当输入电源掉电时采用单节备用锂电池供电4.2V,存在LDO输入端有电压3.5-3.6V,再次上电后LDO无输出。
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Hi
如果LDO输入电压是够高,在LDO输入增加一个二极管阻止反向电流。
不如电压不够(减去二极管电压后小于LDO Vdrop),可以在LDO输入输出直接增加一个反向肖特基,在有反向电压时,肖特基可以保护LDO内部晶体管。