我在用BQ24103A对锂电池组进行充电,电池组电压范围是6.4V~8.4V。BQ24103A输入端接9.5V/2A的电源,输出端经过电流采样电阻0.1欧姆接到电池正极VBAT。现在我发现测到输出端电压8.3V,而此时电池正极开路电压实际上只有7.6V,怎么会相差这么多呢?按理说0.1欧姆采样电阻上流过的电流1.8A,那么上面的压降应该只有0.18V,即使充电时电池电压会被太高一点,凭经验应该也不会令BQ24103输出端达到8.3V吧?
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