Calculate duty cycle and transformer parameters for flyback DC-DC converters.
Design Specifications
Secondary turns / Primary turns
Converter Parameters
Enter design params
Quick Reference
DDuty Cycle (fraction)
Ns/NpTransformer turns ratio
CCMContinuous Conduction Mode
DCMDiscontinuous Conduction Mode
Overview
A flyback converter is a buck-boost converter with the inductor split to form a transformer. It is used in low-power isolated power supplies like cell phone chargers.
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Pro Tips
Maximum duty cycle is usually kept below 0.5 to prevent transformer saturation.
The turns ratio (Ns/Np) helps step the voltage up or down significantly.
Output diode voltage drop (typically 0.7V) should be considered for low output voltages.
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Fun Facts
"The flyback name comes from the 'flyback' motion of the electron beam in old CRT televisions."
"Flyback converters work by storing energy in the transformer's magnetic field during the ON time and releasing it during the OFF time."
"They provide galvanic isolation between input and output, which is crucial for safety."
