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两个TPS63002能同时工作么?

Other Parts Discussed in Thread: TPS63002

        用两个tps63002稳压,中间为一个远距离的导线,当工作时,发现后一个芯片发热特厉害,不能常工作,测了一下后一个的输入电压有4.3V,两个电路外围都是按照推荐的电路。另外,如果在第二个芯片外加电源供电1秒钟后就能正常工作,也不发热了?请问这是什么原因?