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LM3429 BUCK电路中的nDIM脚



我用datesheet中的降压方案做一个恒流驱动!!输入28V 输出17V 1A

1、请问是否可以把nDIM脚悬空,悬空之后是否会引起芯片保护???

2、调试板子时无输出,如何检查IC芯片是否工作。

   谢谢!!!

这是这几个脚的波形图,附件是原理图,请问问题出在哪里!!

谢谢!!

几个管脚的波形图.docx