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LM5118MH BUCK模式输出异常调查



原理图如上:

问题:VOUT没有输出

调查:①输入VIN=15V,EN=13.5V UVLO:2V,RT:1.1V

②SS,FB都是0V;异常点,正常的差不多是1.23V左右

③COMP:5V 异常点,我测试正常这个电压都是比较低的

④HO输出低电平,所以上管Q6没有导通,HS,HB都是低电平;