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LM5022升压电路输出跟输入基本一致

Other Parts Discussed in Thread: LM5022

这是WEBENCH设计链接,webench.ti.com/.../95,

下图是根据WEBENCH做的电路图。所用电感,MOS管都是WEBENCH推荐的。

现在问题是,输入12V本来是输出100V,现在是输出跟输入差不多电压,输入12V,输出11V多一点,也就少个二极管压降。示波器测量LM5022的5脚,是有占空比非50%的方波出现,说明芯片应该工作了,难道是MOS管坏了?(手里没有MOS管了不能验证猜想)