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LM5164dcdc效率问题

Other Parts Discussed in Thread: LM5164

各位大神,现在想用lm5164来实现48V的标称输入,75Vmax,输出想达到5V,500mA,官方的datasheet上只有输出12V时的效率曲线,用来输出5V是不是效率不高?

以及用了设计工具发现效率最好在88%左右,有没有可以提高的办法?