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关于lm5118搭建的电源电路



请教一下 我找ti模拟搭建出来的电路,当我在不接FB脚或接地时能为16v左右,接地为0v,但是一旦接入分压电阻,输出只为3.1v左右,fb电压为零点几符,显然没有正常工作,并且调整分压电阻没有用的,请问这是怎么回事