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关于电源芯片输出电流的问题



假设电源芯片A输出Va=5V,A给电源芯片B、C提共输入电源:

B输入Va并输出Vb=3.3V,B能输出的电流是250ma;

C输入Va并输出Vc=1.8V,C能输出的电流是100ma;

那么对芯片A必须要具有输出电流大于等于350ma电流的能力,对吗?