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TL431: Some questions about the voltage on VREF

Part Number: TL431

Hi all,

   I have used the TL431 to regulate the voltage, Vin=30V, Vout=24V, I am curious about why the voltage on the VREF is 2.46V, not 2.5V. When I reduce the ratio of R2/R3, the voltage of VREF will be 2.5V. Can you help me explain such phenomenon? Thanks.Noname.TSC