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请教一下
按照数据手册设计了一个buck电路，输入6.4V，输出4.2V，设备上电时，用万用表量buck电路输出电压，电压从一上电的2.2V被逐渐拉低到0.8V，8S后恢复到4.2V我想问一下这个是什么造成的电压跌落？原理图如下
