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LM5122: 用lm5122做的12V升60V电源纹波大而且地被污染

Part Number: LM5122

做了一个12V升60V的电源模块,输出要求是60V,0.3A。方案是按照webench给的设计的,自己画的pcb,不知道是不是布局问题,输入地和输出地在空载的时候有500mV的纹波,带载之后整个地都被污染了,纹波能达到5V以上,不知道什么原因,求解答

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