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LM2840输入超过11V会烧管子

Other Parts Discussed in Thread: LM2840, LMR14006

用TI 的LM2840实现9~42V的输入,输出是DC5V,现在测得随着输入电压的抬升,输入电流也跟着增加,当输入电压超过11V,则整个管子被烧掉,请问这个是什么原因,在8~11V的输入时,测得SW引脚有正常的方波,请问这个是什么原因?原理如如下,另外电感L1从15uH改为330uH,还是会烧管子,这个是什么原因?肖特基二极管改成FR107也是会烧管子。