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LM25117低温-40度的时候芯片损坏?

Other Parts Discussed in Thread: LM25117

LM25117做了一个电源输入24V输出12V,电流8.5A,常温和高温都没有问题,每次做低温-40度芯片都会损坏,和正常测试的时候发现HB和SW的二极管反向是导通的,测试正常的反向是截止的,更换芯片就好了。要从哪几个方面入手查找问题?或者要注意哪些方面?