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关于LM3150的问题



各位TI的大神们,我用WEBENCH做了一个降压电源,这是原理图

我把实物做出来以后不能用,我测了一下HG和LG的波形,是正常的,但是SW脚的波形就不对了,这个是波形
  

为什么波形不是脉冲波,毛刺这么多,请问是什么原因导致的