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LM25116EN端拉高了之后。拉低没反应

LM25116EN端拉高了之后。拉低没反应,使用3.3V控制的,外面拉低后,我测量了一下EN端发现还有7.4V电压。

另外,请教一下24V输入,0~20V可调输出,最大10A——BUCK的电感应该怎么选型,平时计算的都是定输出的,可调输出不会算,谢谢。