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LM22676-ADJ烧坏



LM22676-ADJ芯片,我选择的封装是TO-263 (3)。7脚是EN ,我将7脚直接接地一通电就烧坏,或者我将7脚用2K电阻上拉至3.3V,也是一通电就烧坏,我的输入电压是DC15V,请问下我的问题可能是出在什么地方?