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有关稳压芯片的输出电流问题

Other Parts Discussed in Thread: LM317

我想请教一下稳压芯片的输出电流是怎么回事,比如LM256输出电流有3A,什么才会输出3A的电流,我做了LM2596-adj试了不同的输出电压和电阻,我是按照VO/R算的电流,可是算下来电流很小,根本连0.5A都没有,那么我想请问3A是怎么回事?