Luis

I wasn't at all annoyed.
Just suggesting that knowing how the components behave is fundmental to all 
that follows.
You now seem to have mostly made the jump to light speed :-).

10 kHz is VERY low for a modern converter.
Only run there if there is special need.
Core will be much larger than usually needed.
100 kHz is a sensible modern minimum.
Using a powdered iron core from eg Micrometals (Gargoyle knows) would be 
cheap and tolerably good. Beware of clone limitations of Micrometals 
products.  All nominally equally specd powdered cores are not created equal.

Continuous mode is generally better - but the equations end up surprisingly 
complex - not hard or inobvious - just with many terms.,

For lossless approximation the duty cycle is essentially in the inverse 
ratio of Vin and Vout.

Skimming your design procedure it looks OK enough (E&OE YMMV ...)

Building a somewhat lower powered version to start is probably wise. ~60 
Watt's is enough to get good magic smoke when things gang aglae.

What controller IC do you intend to use?


          Russell 

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