TL431 Calculator

Free online TL431 voltage calculator. Input R1, R2, and Vref to instantly determine Vout and shunt current with our responsive interactive schematic.

V_IN R_sup V_OUT R1 R2 TL431
V
kΩ
kΩ
V
Ω
Output Voltage (VOUT): 4.99 V
Formula: VOUT = Vref × (1 + R1 / R2)

What is a TL431 Voltage Regulator?

TL431 is a programmable shunt regulator which will act like as an adjustable Zener diode. The standard Zener diode has fixed voltage but the TL431 is allow you to set the output voltage using tow external resistors. It contains an internal reference voltage of 2.495V.

When the reference voltage is reached through the two voltage divider circuit using resistor R1 and R2 then the TL431 conduct and current pass through the Anode and Cathode pins.

TL431 Calculator Formula

Vout=Vref×(1+R1R2)V_{out} = V_{ref} \times \left(1 + \frac{R_1}{R_2}\right)
  • Vref = 2.495V
  • R1 is resistance value of R1 resistor.
  • R2 is resistance value of R2.

Practical Applications of the TL431 Circuit

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Akhil Satheesh

Akhil Satheesh

Akhil Satheesh is an electronics expert and the Founder and CEO of Soldering Mind. Specializes in designing innovative electronic circuits and custom, high-performance PCB layouts. Every project he shares on solderingmind.com is rigorously bench-tested to ensure accuracy for makers and hobbyists alike.

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