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关于运算放大器TLV2711IDBVR的使用问题

Other Parts Discussed in Thread: TL431

该运算放大器采用5V单电源供电,其输出端和反相输入端直接连在一起做电压跟随,运放上电后,同相输入端输入2.49V的参考电压,一开始运放跟随输出2.49V的电压。可是用了一段时间输出板变成了0.7855V,又过了一段时间,输出又变为2.49V,想知道运放做电压跟随为什么会出现这样的情况?