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LM5157: 输出电压不稳,有震荡,求解

Part Number: LM5157

使用LM5157RTER芯片搭建SEPIC电路,参考的是demo板上的电路图,如下图所示:

但是实际制版后,SW处的波形如下图所示:

输出的24V不知道为什么会有震荡,这就造成24V转5V、5V转3.3V的输出都有震荡,24V波形如下图所示:

请教各位大神,求解,在线等,急急急!!