ElectricalFree Tool

Flyback Converter Calculator

Provided byOmni Calculatoromnicalculator.com

Use the flyback converter calculator to find the duty cycle, currents, and inductances for the primary and secondary ...

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About this tool

What Flyback Converter Calculator does

A flyback converter calculator that determines the duty cycle, peak currents, and inductance values needed for both the primary and secondary windings of a flyback circuit. Users enter the input voltage, output voltage, rectifier voltage, winding ratio, output current, and switching frequency to receive the key design parameters. The output provides the duty cycle as a percentage and the required inductance values in henries, along with the peak current on each side. The calculator is embedded within Omni Calculator’s broader electronics suite, offering a clean interface with labeled input fields and instant results. Unlike standalone calculators, it is part of a larger collection of 59 similar electronics tools, allowing users to quickly switch between related calculations such as Ohm’s law or resistor networks without leaving the site. The page also includes educational context about flyback converters, buck-boost principles, and transformer theory, which helps users understand the assumptions behind the numbers.

Step by step

How to use the Omni Calculator Flyback Converter Calculator

  1. 1

    Enter the input voltage (V in) of your circuit

  2. 2

    Enter the desired output voltage (V out) and rectifier voltage (V rect)

  3. 3

    Specify the winding ratio (N) and output current (I out)

  4. 4

    Set the switching frequency (f s) to calculate the duty cycle and inductance values

  5. 5

    Review the calculated duty cycle, peak currents, and inductance for primary and secondary sides

Is it right for you

Best for

Electronics hobbyists and circuit designers who need quick, reliable calculations for flyback converter winding parameters without manual formula manipulation.

Limitations

  • Results depend on the accuracy of the input values provided
  • Calculator assumes continuous conduction mode and ideal components
  • No unit switching available; all outputs are in standard SI units
Questions

Flyback Converter Calculator FAQ

Can this calculator design a complete flyback power supply?
It provides the key electrical parameters—duty cycle, peak currents, and inductance values—for the primary and secondary windings. Users still need to select actual components, account for losses, and verify thermal limits for a finished design.
What switching frequency should I enter?
Enter the frequency your switching transistor or driver will operate at, typically between 20 kHz and 100 kHz for standard designs. The calculator uses this to determine the on-time and inductance requirements.
Does the calculator account for efficiency or voltage drops?
No, the tool assumes ideal conditions. Real-world efficiency, diode forward voltage, and transistor saturation will affect the actual duty cycle and inductor values, so results should be verified with a design margin.
Is the winding ratio the turns ratio of the flyback transformer?
Yes, the winding ratio (N) refers to the turns ratio between the primary and secondary sides of the flyback transformer, which directly affects the reflected output voltage and duty cycle.
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