Transformers and Power Supplies
Buck Converter Calculator
The purpose of Buck Converter is to turn input voltage and duty cycle into ideal buck output. Keep the source condition with the saved result so later comparisons remain meaningful.
Calculate Ideal buck output
Enter ratings or measurements that describe one scenario.
From inputs to result
Start with the equation Vout = Vin × D. The participating entries are Input voltage and Duty cycle.
The defaults produce 8.40 V. Replace them with measurements from one operating state.
Calculate ideal buck output from input voltage and duty cycle. For the companion ideal boost output calculation, open Boost Converter Calculator.
Measurements and entries
Identify RMS, average, peak, and rectified quantities explicitly. Nameplate and meter values are not interchangeable unless they describe the same condition.
Use the displayed unit for every field and document conversions separately. Use Loaded Voltage Divider Calculator as the companion source for loaded output voltage.
- Input voltage
- Default example: 24 V. Enter input voltage in V.
- Duty cycle
- Default example: 35%. Enter duty cycle in %.
Applying the result
The primary answer, Ideal buck output, describes only the entered scenario. Compare it with voltage stress, current stress, ripple, loss, regulation, and temperature.
Keep the input set beside the output so another reader can reproduce it. If you also need output magnitude, continue with Buck-Boost Converter Calculator.
A second scenario
Change Input voltage from 24 V to 28.799999999999997 V with every other entry unchanged. The result changes from 8.40 V to 10.08 V.
This isolates one variable; a real system may change several at once.
Assumptions and limitations
Continuous-conduction ideal operation is assumed.
The simple equation may need adjustment for isolation, creepage, waveform shape, and manufacturer operating limits. Test an additional scenario when an omitted effect has a plausible range.
Record waveform, frequency, load level, and winding or device temperature.
Questions about inputs and assumptions
Which source values should I use for Ideal buck output?
Measured and rated values can represent different states. Use voltage and current values from the same side of the transformer or converter.
What should I verify beyond the displayed inputs?
Continuous-conduction ideal operation is assumed. A broader review should include leakage inductance, parasitic capacitance, saturation, switching transients, and cooling.
Why might a second instrument give another answer?
Differences can come from isolation, creepage, waveform shape, and manufacturer operating limits, measurement uncertainty, or values taken under different conditions.
Can I change several inputs at once?
Use separate labeled cases when more than one condition changes. Use voltage and current values from the same side of the transformer or converter.
Does the answer include a design margin?
No. Compare the value with voltage stress, current stress, ripple, loss, regulation, and temperature and apply relevant equipment and installation requirements.