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BQ24171电池充电电路,SW、ACDRV、CMSRC引脚工作不正常

Other Parts Discussed in Thread: BQ24171, BQ24171EVM-706-15V

各位技术达人,求助!

我用的BQ24171芯片,按照ti提供的DEMO电路原理图重新做了一套电路板,按照1P3S负载设置的参数,现在的问题是SW、ACDRV、CMSRC引脚输出不正常:

1.当不接电池时,SW引脚能够输出DCM工况下的PWM波形;

当接入电池时,SW引脚不工作了,每40ms能够有极短时间的PWM输出。

2.当不接电池时,ACDRV、CMSRC引脚输出直流波形,能够使背靠背的MOSFET一直导通;

当接入电池时,ACDRV、CMSRC引脚输出状态不正常,类似于PWM一样,间断式导通。

下图黄色的为ACDRV、CMSRC波形