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批量生产过程中约有1%几率出现FB引脚对地短路，电路是一个带输出限流保护的多电压输出电路，多电压输出靠跳键帽支持，前端输入电压为稳压电源提供的5V输入，请问是什么原因导致这样？
前端输入电压为稳压电源提供的5V输入，请问是什么原因导致这样？
