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LM25085工作不正常



24~32V输入,15V输出,按照webench仿真设计的原理图,参考评估板以及仿真布局布线做的电路,上电28V后,Vout没有输出电压,VIN-VCC几乎等于0V,去掉PMOS后芯片上电28V,VIN-VCC等于1.2V左右,,,按照芯片内部的Negative Bias Regulator看,这两个引脚之间正常供电后应该是稳定的7.7V左右波动啊,1V左右的压差是不是意味着芯片的这一部分已经挂了?