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Ideal Flyback Converter Calculator — result sheet
Estimate flyback output voltage and the duty cycle needed for a target from input voltage, turns ratio, and diode drop.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Vout + Vdiode = Vin·(Ns/Np)·D ÷ (1 − D).
An ideal continuous-conduction flyback stores energy in its magnetizing inductance during the switch-on interval and transfers it to the secondary during the off interval. This calculator uses the bounded ideal voltage relation to show how duty cycle and turns ratio affect the output; it is not a complete magnetic, thermal, snubber, or control design.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Input voltage — V; minimum 1.0E-6; maximum 10000000
- Target output voltage — V; minimum 1.0E-6; maximum 10000000
- Entered duty cycle — %; minimum 1.0E-6; maximum 99.999999
- Secondary-to-primary turns ratio Ns/Np — ratio; minimum 1.0E-6; maximum 1000000
- Output diode drop — V; minimum 0; maximum 1000000
Worked example
| Input | Value |
|---|---|
| Input voltage | 24 |
| Target output voltage | 12 |
| Entered duty cycle | 40 |
| Secondary-to-primary turns ratio Ns/Np | 0.5 |
| Output diode drop | 0.7 |
The ideal flyback estimate is 7.3 V at 40% duty; reaching 12 V would require about 51.42% duty in this model.
Assumptions and limits
- The relation is treated as an ideal continuous-conduction flyback voltage model with a positive secondary-to-primary turns ratio.
- The diode drop is a fixed entered value and other semiconductor, winding, leakage, and switching losses are omitted.
- The result does not select a core, winding wire, gap, frequency, current limit, reset network, or compensation scheme.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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