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LM22672容易损坏,冒烟,请教保护原因!

Other Parts Discussed in Thread: LM22672

如图电路图:当我把电源+28V,用手快速断开又接上,LM22672就冒烟了,这是我偶尔发现的,又测试了一个,还是同样的情况?请教大神们,这是什么道理?

测试中,我的+28V输入电源,是由开关电源提供的,如果把LM22672的 +28V输入接好后,再打开开关电源,这样操作是没有问题的。 谢谢