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LP2992IM5-5.0没有输出



我使用LP2992IM5-5.0时,这是一款输入电压可调节,输出固定不变5V,但是我把输入电压从6V调到7.5V,输出电压可以输出5V,再把输入电压向上调节时,输出电压就变为0V,外围电路按照资料设置,但是调节外围电路的电容,也不能输出5V,而是0V,已经搞坏了两个芯片了,很是郁闷。请教高手解答,谢谢!!