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LM2611: LM2611输出电压如何计算

Part Number: LM2611

Hi 专家

     我在LM2611的datasheet里面没有找到有关输出电压的计算公式,根据一般DCDC的规律,我认为Vout=(1+Rf1/Rf2)*Vfb

但是datasheet里面-5V输出的Rf1=29.4K ,Rf2=10k.  按照上面公式算Vout=4.85V.  请问这个输出计算公司不对嘛?