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TPS54060 5V输出击穿续流二极管SS34

Other Parts Discussed in Thread: TPS54060

板子上用了两路TPS54060分别输出5V, 18V. 现场却出现好几块5V输出SS34被击穿短路(ZD2), 而18V输出SS34 ZD1却正常。 按道理说SS34耐压40V, 并且18V通道受到冲击还高,却在5v通道烧毁。VIN约32VDC, 由24VAC整流滤波过来。

各位高手有没什么经验,帮忙分析下原因,谢谢合作。