Calculate TL431 feedback divider resistors for adjustable shunt regulator circuits.
This calculator helps choose feedback resistors, timing parts, inductors, capacitors and thermal margins for practical power supply circuits.
Enter your target values and the calculator returns practical component estimates.
Useful for microcontroller boards, bench supplies, LED drivers, battery devices and DC/DC modules.
Always verify with the datasheet, recommended application circuit, PCB layout rules and real measurements.
They are starting estimates. Verify with datasheets and real load tests.
Switching regulators are sensitive to loop area, grounding and capacitor placement.
Check current, thermal limits, feedback reference, inductor saturation and capacitor ESR.
The TL431 Feedback Divider Calculator is used for quick engineering estimates and early design checks. Always verify final values with datasheets, measurements and real operating conditions.
The result is an estimate based on the entered values and formulas. Real circuits can differ because of tolerances, temperature, PCB layout, losses and component limitations.
Check component ratings, voltage and current limits, thermal margin, layout, safety requirements and real measurements under load.
Heat comes from power loss, voltage drop, switching loss, conduction loss and insufficient thermal dissipation.
Use generous margin for voltage, current and temperature. For production designs, verify worst-case conditions and derating requirements.