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BQ25713B充满电后VSYS电压问题

user5014498
Intellectual 430 points
Other Parts Discussed in Thread: BQ25713B

dear TI工程师

   1. BQ25713B供电12V，为8.4V电池充电，充满电后发现VSYS电压为8.8V，电池电压为8.5V，相差有0.3V，按规格书上应该是0.16V（

System voltage is regulated 160 mV above battery
voltage when BATFET is off (no charging or no supplement current).

），这个现象正常不？

2.BQ25713B是自动实现BUCK,BUCK-BOOST,BOOST三个模式自动切换吗？

  • 0
    TI__Guru*** 130456 points
    您好，VSYSMIN设置了吗？
    BUCK,BUCK-BOOST,BOOST三个模式是自动切换的
  • 0 回复 Star Xu
    Intellectual 430 points
    1.VSYSMIN设置了，0xc=0x0 0xd=0x18
    2.充电电压设置是8.4V，输入电压为12V，可以正常充电，但是把输入电压调到11V一下后，就不能正常充电了，上电的瞬间VSYS电压是8.4V，但是过几秒后就拉低到1V了，好像是带载能力不够，是不是输入输出的压差有要求？
  • 0 回复 user5014498
    TI__Guru*** 130456 points
    您好，请参考下面的答复：
    The input voltage and output voltage settings above are fine, and this charger will seamlessly transition between buck, boost and buck boost states without host intervention. When starting up, can you start up with no load, and after converter has been enabled (~200ms after valid VBUS applied) then apply the load and check operation?