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LM5001-Q1: LM5001-Q1

Part Number: LM5001-Q1
Other Parts Discussed in Thread: LM5001

上图为原理图和pcb截图。该电路使用lm5001芯片进行24v输入,33v输出,在未带载情况下,图中D9二极管在上电大约1分钟之后温度急剧上升至200摄氏度以上,同时输出电压变为7v左右。在刚开始上电的一分钟内,输出电压,温度一切正常。
麻烦解答一下问题原因,并给出整改建议,实在不行给出正确的电路设计。
谢谢!