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bq24640达不到设计电流

Other Parts Discussed in Thread: BQ24640

使用BQ24640给超级电容充电,设计输出电压2.5v,充电电流8A。现在的情况是,输出电压是对的,不接负载,充电器输出2.5v,接上超级电容,电容电压缓慢上生,到达2.5v停止上升。但输出电流到不了8A,只能到3A。改变设置电流分别为0.7A,1.5A,2.5A都可以按设置电流输出。电感使用3.3uH,15A饱和,场效应管使用的是IRF540,场效应管可能不合适,但不考虑散热的情况下,应该可以吧,