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BQ24650给锂电池充电

Other Parts Discussed in Thread: BQ24650, CSD17307Q5A, BQ24650EVM-639

使用24650demo板电路(SLUU444A),MOS换成IPU09N03电感4.7uh采样电阻5mR。出现的问题是bq24650工作时会发热。流入VCC脚电流1.54ma,流入STAT1管脚1.7mA。现在怀疑BTST脚流入过大的电流。 手摸IC本身有明显温升。我用这个电路给电池以8A恒流方式给电池充电到14V(实际中只能最大输出7A,而且很快下降到6A),充电时间是20小时每次。大约3次左右,bq24650就会坏。原理图如下: