Buck Converter Duty Cycle Calculator
Enter the input and output voltages to get the duty cycle.
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
A buck (step-down) converter is a switch-mode power supply topology that steps a DC input voltage down to a lower DC output. In continuous-conduction mode with ideal (lossless) components, the output is set purely by the switch's duty cycle D: D = Vout/Vin, the fraction of each switching period the transistor spends on, since the inductor's average voltage over a cycle must be zero at steady state.
Power-electronics engineers use this formula as the starting point for setting the PWM duty cycle on a buck regulator IC — used everywhere from USB-C chargers to point-of-load regulators on a PCB that step 12V or 5V rails down to 3.3V or 1.8V for a microcontroller or SoC — before layering on real-world losses from switch resistance and diode drop.
Was this helpful?
Popular calculators
Loan Calculator
Monthly payment, total interest and full amortization schedule.
Percentage Calculator
Percent change, percent of, and ratio calculations.
Discount Calculator
Calculate final price, savings, and discount amount.
BMI Calculator
Body mass index from height and weight (metric or imperial).
Age Calculator
Compute your exact age in years, months and days from a birth date.
Compound Interest Calculator
Calculate the final amount and interest earned with compounding.
All Calculators
No calculators found
Comments (0)