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TPS56C230: 空载输出异常

Part Number: TPS56C230

hi,

我在使用TPS56C230,设计输入12V,输出3.9V。板子回来上电测试发现,未接负载的状态下 ,万用表测试量电压3.9V 电压左右,但是用示波器交流模式测试输出,出现如下的波形:

原理图如下:

pcb  layout 设计如下:

可能是哪里出问题呢