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电路如图所示，V_SYS是电池电源输入端，电压在3.2V-4.2V之间。（实验时用的稳压电源，电压3.6V，限流5A。）在输出端加电子负载时，负载电流超过1.08A，输出电压被拉低，稳压电源的电压也会被拉低。请教一下负载电流不足是什么地方导致的呢？
