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LM3434的VCC对地为0V

你好,我现在对LM3434的供电是这样的:VEE:0V,(GND) CGND:+12V, VIN: +17V。现在上电之后,VCC对地为0V,DIM脚用10K的上拉电阻拉到+17V也拉不上去,只能拉到CGND(+12V)的水平。请问一下是什么原因?