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BQ40Z50预充电功能 问题

Other Parts Discussed in Thread: BQ40Z50

当BQ40Z50 的预充电功能打开 PCHG_COMM =1 的时候  如下图 我当前电压是15393mv   我设置 Voltage Rang 下面的Precharg Start Voltage 预充电电压为20000mv(20V),我当前电压是15v  按照文档的介绍PCHG这个MOS管应该会自动打开进行充电,但是实现没有发生,请问是还需要设置什么东西吗? 还是本来就不会自动打开这个mos管?