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上图中供电电压是12V,空载时输出的电压是5.02V,接入负载后,输出的电压为4.99V,但是输出的电流不是负载正常工作时的电流,正常工作时的电流是0.26A,现在的输出电流是0.16A,并且电感通电一段时间后,变得非常烫,请问是电路设计有问题,还是散热有问题?(刚接触这款芯片,有一些不太懂)