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BQ24616充电电流问题!

Other Parts Discussed in Thread: BQ24616

BQ24616测试中发现:CC充电时,输入为12V时,电流为0.394A,采样电阻两端电压为6mv,如果输入为19V时,电流为0.437A,采样电阻两端电压为9mv,如果输入电压为28V时,电流为0.450A,采样电阻两端的电压为14mv。    电路设计CC的充电电流为3A。

也就是这点没搞懂,随着输入电压的增加,充电电流才能增大,但是最大也就在1.4A。  为什么没到3A?  开关电路部分有问题吗?   麻烦帮忙解答下,万分感谢!