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BS24650的NMOS发热

Other Parts Discussed in Thread: BQ24650

我用BQ24650做太阳能充电器,NMOS选用威世的SUP40010EL,该管的RDS=2.1mR。充电电流设计为8A,实际充电电流为7A时,MOS管发热就很严重了。根据这个内阻去推算功耗应该不到0.5W,为什么发热这么严重。有没有解决方法?