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bq24600的FB引脚 电压只有1.9V

Other Parts Discussed in Thread: BQ24600

TI专家好:我用BQ24600给6节电池供电,输入28V,不接电池时FB引脚电压稳定在1.9V,而不是2.1V,请问是什么原因?下面是原理图。