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关于LM22676MRX-ADJ 问题?

Other Parts Discussed in Thread: LM22676

LM22676MRX-ADJ   输入电压29V,输出5V,工作电流在0.5A一下,工作一段时间后,输出为0 或与地短路。是否是与BOOT电容为100nF,有关,如何不是,还有其它原因,谢谢!