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LM5017的电源纹波滤不干净会传导到我的3.3V里面去,是我哪里布局不对



上图中有原理图和PCB还有示波器波形,开关频率是300KHZ,在3.3V里面还有2.多MHZ的纹波,这个是什么原因导致的/?