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TPS562231输出电压异常问题

TI大神,或者各路英雄,项目紧急,遇到了问题,麻烦能解答的帮忙解答一下,谢谢先。

原理图如图,

基本上完全按照典型应用电路设计,只是layout没有按照推荐设计,输入电压12V,结果输出的3.3V用示波器看简直惨不忍睹,成了40Hz的脉冲,如下图,为什么会这样呢?怎么才能得到如产品手册上说的30mV纹波的3.3V呢?