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LM5118输出电压不稳定

Other Parts Discussed in Thread: LM5118

用lm5118设计了一个输入在12V-24V 输出在12V的板子,电压输出差不多11.8V左右的样子,就是太不稳定,纹波较大,一阵一阵的,导致我的设备无法正常工作,我是用稳压电源给板子供电的,电源本身纹波很小,但是接到板子上之后再测输入电压,却发现有纹波了。我把原理图,和PCB图,还有测试到的一些波形贴出来,请各位大神帮忙看一下,原因出在哪里,感激不尽!!!