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求助 BQ24105充电问题



给8.4V锂电池充电,12V直流电源供电

  I charge=500mA,Riset 1 = Riset2 = 10K ;Rsns=0.2Ω ; Lo=10uH ;Co = 10uF;电路图就是芯片资料上的参考电路

问题 1    为什么实际恒流充电电流小于500mA? 实际值比理论值小了100mA左右。

问题2     从预充电到恒流流充电 电流值是逐渐增加上去  还是直接跳上去?