Name: DC/DC Feedback Resistor Calculator
Availability: InStock
Author: Oleg Serbinov

Feedback Resistor Calculator

DC/DC Feedback Resistor Calculator
This calculator helps you determine the optimal feedback resistor values (R1 and R2) for DC/DC converter circuits. The feedback network creates a voltage divider that sets the output voltage according to the formula: V_out = V_ref × (1 + R1/R2). Choose from automatic selection with standard resistor values, specify one known resistor, or manually enter both values.

Reference Voltage (Vref/FB)

Output Voltage

Resistor Tolerance

Auto Selection

One Resistor

Manual Input

Resistor Range

kΩ

Known Resistor

Resistor Value

kΩ

R1 (upper)

kΩ

R2 (lower)

kΩ

Resistor Specifications & Package Info

SMD Packages:

                0201: 50mW/15V (max. 50V)

                0402: 62.5mW/50V (max. 100V)

                0603: 100mW/50V (max. 100V)

                0805: 125mW/150V (max. 200V)

                1206: 250mW/200V (max. 400V)

                1210: 500mW/200V (max. 400V)

                2010: 750mW/200V (max. 400V)

                2512: 1W/200V (max. 400V)

Through-hole Packages:

                1/4W: 250mW/500V (Axial Ø2.3×6mm)

                1/2W: 500mW/500V (Axial Ø3.2×9mm)

                1W: 1W/500V (Axial Ø3.6×10mm)

                2W: 2W/500V (Axial Ø5×12mm)

                5W: 5W/500V (Axial Ø7×16mm)

⚡ Safety Factor: Calculator recommends 2.5x power margin for reliability

*Working voltage/Maximum voltage ratings based on industry standards

Developed by Oleg Serbinov

Website GitHub