ElectricalFree Tool

Buck Converter Calculator

Provided byOmni Calculatoromnicalculator.com

Use the buck converter calculator to find your circuit's duty cycle and inductance.

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Screenshot of Buck Converter Calculator on Omni Calculator
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About this tool

What Buck Converter Calculator does

A buck converter calculator determines the duty cycle and inductance needed for a DC-to-DC step-down circuit. By entering the input voltage, desired output voltage, switching frequency, and maximum ripple current, the tool outputs the precise duty cycle ratio and inductance value required to design or verify a buck converter circuit. The calculator also provides the switch-on period and can estimate capacitance, making it a complete parameter generator for power electronics projects. Omni Calculator's version stands out for its layered educational approach. Beyond the numeric outputs, the page includes a detailed explanation of what a buck converter is, how it works, and guidance on choosing switching frequency and building the circuit. It contextualizes the tool within broader SMPS applications like solar panels and electric vehicles, and links to related calculators such as the boost converter calculator. This instructional content, combined with a clean interface that clearly labels inputs like "Input voltage (V in )" and outputs like "Duty cycle (D)", helps users not only get numbers but understand the theory behind them. The site also offers a "Build your calculator" feature and a shareable link for results.

Step by step

How to use the Omni Calculator Buck Converter Calculator

  1. 1

    Enter the input voltage (V in) of your power source

  2. 2

    Specify the required output voltage (V out) for your load

  3. 3

    Set the switching frequency (f sw) for your circuit

  4. 4

    Input the maximum ripple current (I ripple) the inductor can handle

  5. 5

    View the calculated duty cycle (D) and inductance (L) outputs

Is it right for you

Best for

Electronics engineers, hobbyists, and students who need to quickly calculate duty cycle and inductance values for a buck converter design without manually solving switched-mode power supply equations.

Limitations

  • Results are estimates based on ideal component assumptions
  • No unit switching available beyond the default units shown
  • Does not account for real-world component tolerances or efficiency losses
Questions

Buck Converter Calculator FAQ

Can this calculator design a complete buck converter circuit?
It provides the key duty cycle and inductance values, but you will still need to select appropriate capacitors, diodes, and a switching transistor to build a functional circuit.
What switching frequency should I choose for my buck converter?
The calculator requires you to input a frequency; typical ranges are 100 kHz to 1 MHz, with higher frequencies allowing smaller inductors but increased switching losses.
How is the duty cycle calculated in a buck converter?
The duty cycle is the ratio of output voltage to input voltage (D = V_out / V_in), determining the switch-on time per cycle to achieve the desired step-down voltage.
Can a buck converter step up voltage instead of down?
No, a buck converter is a step-down topology by design; for stepping up voltage, a boost converter calculator should be used instead.
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