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LM5175Q1 MOS管一直处于导通状态导致输入对地短路

Other Parts Discussed in Thread: LM5175

各位大虾,设计的LM5175Q1 DC-DC变换器,Vin:9V~18V 。Vout:12v。空载状态加12V电压时M2发热严重,测输入电流>500mA。M2栅极为高电平。是啥原因,小弟请教了!