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LM25085A 输出21.5V MOS 发热严重

Other Parts Discussed in Thread: LM25085A

请教一下LM25085A的发热问题

输出为21.5V  最大输入电压26V,PMOS AP6679 Qg=70nc   td(on)=13ns, td(off)=64ns,tf=42ns Rds(on)=15mR,

输出电压正常。

现在问题是带载工作时(3A左右)MOS发热严重,请教一下有没有参数配置方面的问题。

谢谢!