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TPS5450电源输出电流问题

Other Parts Discussed in Thread: TPS5450

我最近在测试TPS5450的输出电流问题,但是我发现,我设计的板卡在输出负载1Ω时,输出电压只能达到4.77V,不知道这可能是什么原因呢?

PS:我电路设计和datesheet中推荐的参数一样的,器件参数选型也没有问题,PCB布局也是按照推荐的方式进行的。