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TPS54020 输出电压问题

Other Parts Discussed in Thread: TPS54020

我们电路板上使用了三个TPS54020分别输出1.8V,2.5V 和3.3V电压,输入电压是12V。我们设计的电路是参考手册上推荐的电路来的,加电后我们通过示波器观察了输出电压的波形发现三个不同的电压输出上都叠加了一个50KHZ左右干扰信号,信号幅值大概1V左右,如下图所示,不知道这个干扰信号从哪里来的,有知道原因的还请不吝赐教。