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LM5165-Q1输入端（输入9V）断电后半分钟内，输入端和输出端有残留电压，电压幅值大概在1.8V慢慢下降，请问这是什么原因？！谢谢。电路如下（电路图中虚线框内元件已删除）：
电容上储存的电量没有泄放回路，所以只能慢慢下降了。
