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LM5050MK-1 VGS电压不够



请教大家一个问题,按照IC规格书芯片内部有泵压12V。为什么我测量到VGS才4.几V。

我的电路哪个地方出问题了?

输入是25~43V,Q1 Q2的VGS才4.5V左右。是什么器件选错了吗?