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BQ24650: BQ24650充电电流偏小

Part Number: BQ24650

hello 我调试发现在TS脚两个电阻改变,也就是使R124我现在用4.7K电阻,然后在TS脚引一根线接触一下3.3V,或者高电压,芯片就启动充电;但充电电流偏小我用室内开关电源模拟给21V,充电电流只有1.0A,然后我改了取样电阻R127为8毫欧,充电电流为1.4A,在用太阳能电池板发现直接用太阳能电池板给电池充电电流可达100mA,但用这个电路却只有40mA,不知道是哪里问题,还有就是为什么ts脚把R124改为4.7k然后引线接触3.3V就可以启动充电?bq24650电路图3.pdf