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BQ40Z50充电管理是如何实现的?

Other Parts Discussed in Thread: BQ40Z50-R2, BQ40Z50, BQ25895

看BQ40Z50-R2 Technical reference manual文件中详细介绍了充电算法的管理,但是有一点疑问的地方就是这个芯片可以怎么控恒流恒压的模式以及相应的电流的?

充放电回路可控的只有三个MOS管(CHG,DSG,PCHG),看规格书介绍这三个管子应该是工作在饱和区而不是线性区,那充电电流是怎么控的呢?