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LMR64010XMFE 使用异常问题

Other Parts Discussed in Thread: LMR64010

使用LMR64010做了一个12V升24V的电路。同样的原理图、元器件和PCB Layout的情况下。第一版电路正常工作,第二版电路出现异常。在无负载的情况下图中D7二极管上电瞬间发热,输出电压基本与输入电压相同。 当降低输入电压时电路工作又正常。请问这种情况大概是什么原因?