How to design a flyback converter?

User,
Thanks for the interest in TI here. Have you seen this "under the hood" : www.ti.com/.../slup261.pdf

I like the design example walk-through in this paper as well: www.ti.com/.../slup302.pdf

And this overview for AC/DC flybacks:
www.ti.com/.../slup325.pdf

For magnetics design check out these:
www.ti.com/.../slup076.pdf
www.ti.com/.../slup338.pdf


For multiple outputs you may also consider reviewing these:
training.ti.com/multiple-output-flybacks-how-improve-cross-regulation

e2e.ti.com/.../differences-between-psr-and-ssr-in-bias-power-supply-design

www.edn.com/.../Power-Tips--78--Synchronous-rectifiers-improve-cross-regulation-in-flyback-power-supplies

Can you share your input voltage range and output voltages and current? We have over 20,000 reference designs (about 1500 public online) and we may have something close to what you need.

Regards
John