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LM5118输出及输入波形异常

Other Parts Discussed in Thread: LM5112

用LM5112搭一块稳压电路,设计输入9~32V,输出12V/2A,按照WEBEACH设计原理图和LAYOUT,发现输出波形有纹波,一阵一阵的,频率在315kHz。请各路大佬帮忙解答下