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BQ24650 充电效率问题

Other Parts Discussed in Thread: BQ24650

最近在太阳能充电IC bq24650 .发现用18.5.1A的稳压适配器,在充电时,值输出14.v 5.8A的充电电流。电感,mos管,电路板都很烫。考虑是效率问题。18*5.1=90w,12.7V*5.8=73w 效率才81%,导致发烫。请问有哪些呀注意的。