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TL431 Series Shunt Regulator: Calculating the Output Voltage from the Voltage-Dividing Resistor

Author: DX7IIFDExecutions: 2620
TOP/Shared Formulas (Engineering)/Electrical & Circuits

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Calculating the output voltage from the voltage-divider resistor at the Ref terminal of a TL431-series shunt regulator
Calculates the power supply output voltage based on the values of the two voltage-dividing resistors, R1 and R2, connected to the Ref pin of the TL431.

*We do not know how to handle units in k or M. Please convert them to Ω and enter them.*
R1
Ω
R2
Ω
 V
*This applies only to power supplies that use a voltage divider (R1/R2) to split the output, feed that voltage into the Ref pin, and apply feedback via a TL431-series shunt regulator. Since this depends on the circuit configuration, this calculation may not necessarily yield the output voltage for all power supplies.

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