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BQ24171工作输出电压异常

Other Parts Discussed in Thread: BQ24171

TI您好,我们采用BQ24171为2节串联锂电池充电(12V输入,设计输出电压8.4V),实际测量输出电压11.25V左右,FB反馈电阻330K,100K,参数正常。实际测量FB引脚电压2.7V左右(正常电压应为2.1V),示波器测量Q1,Q2,驱动开关频率为20HZ左右,请帮忙分析一下问。电路参考TI关方设计方案。