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Flyback Transformer Design Calculator | Power Electronics Tool
Home› Applications› Flyback Transformer Design Calculator
Designing a high-performance flyback transformer is crucial in modern power electronics. This tool helps you optimize winding turns, calculate turns ratio, and estimate magnetic parameters in seconds. Whether for DC-DC converters, LED drivers, or battery chargers, accelerate your design workflow with confidence.
- Accurate primary & secondary turns calculation
- Integration of core AL value
- Instant turns ratio output
- User-friendly responsive interface
Calculator
How Flyback Voltage is Calculated
The flyback topology stores energy in the transformer's core during the switch-on period. When the switch turns off, that energy is transferred to the secondary winding. The output voltage (Vout) can be approximated by:
Vout ≈ (Np/Ns) × (Vin − Vd) × D
Where D is the duty cycle, Np and Ns are the primary and secondary turns, and Vd is diode drop. Adjust turns ratio to achieve precise output voltage under varying load conditions.
Common Applications
- Isolated DC-DC converters
- Battery charging circuits
- LED lighting drivers
- High-voltage power supplies
Frequently Asked Questions
- What is a flyback transformer?
- A flyback transformer stores energy in its magnetic core during the primary conduction phase and releases it to the secondary during the off-phase. It provides voltage isolation and step-up or step-down conversion in switch-mode power supplies.
- How do I choose the core AL value?
- Core AL value (nH per turn squared) depends on your core material and geometry. Refer to the manufacturer's datasheet for accurate AL values to ensure proper inductance.
- Why is turns ratio important?
- Turns ratio defines the relationship between primary and secondary voltages. Correct ratio ensures desired output voltage and efficient energy transfer.
- Can I use this calculator for other transformer types?
- While optimized for flyback topologies, the core winding calculations apply broadly. For other transformer types, adjust the formulae accordingly.
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