design flyback transformer with gap core
it does have f/b.
however in comparison to using the controler chip in a say buck regulator topology, and the same chip in a flyback circuit, the difference in regulation ability
is huge, is it just my luck or is there a reason for that, I don't know.
in either case f/b is a resistor divider network, so ought to have similiar ability.
the primary has 8Turns, the reset winding 8T and the secondary 17T (i think)
I'll retry this again, should I go more turns or less with the primary ?
By changing Ct, cap I experiment with different freq from about 20khz, to about 120khz
so far i've stuffed 2x uA78S40, (well got them free)
there is something wrong with 78S40, specifically f/b and it supposedly regulating - maybe thats why its obsolete. Its available voltage ref pin, and addition opamp is
handy tho.
More success with MC34063.
Somehow maybe its frequency control regulator blocks so far using and having not much luck or i'm just unlucky.
I have some TL494 lying around, so i'll try next, so perhaps pulse-width control has better ability ?
Looking at buying some sw control chips, SG3525 - can directly drive mosfet,
or I should maybe look at something that can do specifically current mode control ??
Suggestions ?