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BQ24630充电问题



按文档资料做好PCB,充电电流设置5A,设置充满电压为25.3V,电池电压为23.2V,输入电压为28V/5A,接好电路,充电电流只有2.2A,采样电阻都为10毫欧,TTC计时脚电压无上升,接上示波器地,充电电流变为3.3A,调节输入电压,充电电流会改变,请问那里会存在问题,