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有关OPA549的输出

Other Parts Discussed in Thread: OPA549

如上图,OPA549的datasheet中输入输出电压差与电流的关系。

我的问题是,当我输出5A时,供电为12V,其最大输出电压只能达到6V,输入输出压差已经达到了6V,而不是上图中的3.5V,这是为什么呢?