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关于BQ2002的充电问题

Other Parts Discussed in Thread: BQ2002

各位大侠,我在做一个镍氢电池的充电电流,有幸从网上弄到了一个BQ2002的样板电路,可搭建出来后,发现充电到不了12.5V,无论电阻怎样改动,只能到11.5V,怎么回事,请大侠们帮帮忙,谢了。我是通过24V开关电源充的,TS脚我拉的是高电平,只有BAT脚进行反馈,按照电路上的计算,BAT脚基本上在1.2V左右,可我改动电阻后,BAT脚都降到0.8V了,CC脚还是打开。