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使用TLV1117IDCY将12V变为5V，电流需求是0.5A。电路图如下所示，输出不是5V，而是6.3V，为什么？
为了输出正确电压，只能调整两个电阻R1=6.8K，R2=13.2K时，输出5.3V，为什么？这与公式完全不匹配啊。
亲；请确认IC是否来自TI一级代理（官网名录）。
