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BQ24195L EMV求教 充电电流低于设定值



本人正在使用BQ24195L EVM给电池充电,测试中发现充电电流达不到预定值。以下是详细情况:

使用5V1A的直流稳压电源,电池充电电压4.2V,D+\D-短接,ILIM限制为3A

寄存器设置为:

REG00 = 0x35;      REG01 = 0x1B;    REG02 = 0x60;     REG03 = 0x11;    REG04 = 0xB2;   REG05 = 0x8A;  REG06 = 0x03;  REG07 = 0x4B;

在此结果下读到的状态为:

REG08 = 0xB4; REG09 = 0x00;

STAT LED不亮,充电电流为500mA左右,如果换用电量更多的电池(60%左右)充电电流会更低。

观察SW波形,频率为1MHz左右

更改寄存器设置,REG05[7] = 0,此结果下读到的状态为:

REG08 = 0xA4; REG09 = 0x00;

STAT LED亮,充电电流为500mA左右,观察SW波形,频率接近1.5MHz

为什么充电电流达不到预设的1.5A呢?