The flyback period is 60% (12 µs), and the time averaged secondary current for 100W output will be 5A. We have chosen to make secondary conduction period 10 µs.

The “transformer” is now wound using a wire size for the 60 turns primary that will use less than 50% of the bobbin area to allow for insulation. The remaining space is used for the secondaries.

The transformer gets hot because the core is saturating, and the whole thing takes several amps of current. it’s a great heater, but a very inefficient high voltage generator.

Designing flyback transformers for switch-mode power supplies involves many calculations. A spreadsheet can make short work of this otherwise-tedious task. When you develop flyback power supplies, ...

[Grenadier] Had some spare wire, electrical tape, and a giant ferrite core laying about and decided to create a massive and pretty snappy looking disk shaped flyback transformer. Dubbed the Fryback… ...

The operation and regulation principles are quite similar to a buck on the primary side. The flyback-like secondary side tracks the primary output closely through the transformer. Figure 4. Fly-Buck ...