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对于充电芯片BQ24172,当用usb供电时,该芯片的输入电压Idpm为多少?

Other Parts Discussed in Thread: BQ24172

根据芯片手册的figure 3 ,可以计算得到Idpm=2A,但是usb只能提供500mA,那么2A是怎么产生的 ?谢谢!