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BQ25172: BQ25172充电电压?

Part Number: BQ25172

采用BQ25172给三节镍氢电池充电,每节电池满电是1.7V,实际测试发现:输入6V电源情况下,电池端到达4.5V左右,充电就停止了,TS下拉到地,时长10H,demo上对应的是TS和FIXED连接,定时电阻选择的是R12 18K,示波器抓了下,电压也是没达到5.1V,示波器看电压仅达到4.46左右,然后充电就停止了,请问如何设置,保证单节电池充电电压可达到1.7V?