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请教BQ24450C充电问题

Other Parts Discussed in Thread: BQ24450

我用BQ24450给24V铅酸电池充电,输入电压32V,发现只能充到23.5V左右电压就不升了,我的Ra,Rb, Rc,Rd,都是按照技术文档上第15页的公式计算的啊!

设计的是Vfloat=27.6V,Vboost=29.4V,Vth=21V,     所以计算出RA=493.6k,RB=17.4K,RC=46.4K,RD=665K。是我这几个值计算的不对么??

求高手指点下啊 !!!!!!