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TPS562201: 输出电压不稳定,输入电流有很大波动

Part Number: TPS562201

尊敬的团队,我在做一个12-5V电路,原理图如下:

现在的输出电压只有3.9V左右,并且输入侧电流一直有很大的跳动,SW波形波形如下,请问可能是什么原因呢?