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LM5005 的二极管Df发热严重

Other Parts Discussed in Thread: LM5005

原理图如下图,Df 型号是CD214B-R3600,也是Webench Designer中推荐的型号,另外图中C638、R392未贴。

输入电压24V和48V,输出电压5V都正常,LM5005 的温度不高,但是二极管发热严重,温度非常高,如果输入电压越高,发烫越快。请问可能是什么原因?

测量到整板输入功耗:48V、0.1A