Re: I want to design a simple dc/dc regulator from 12V to 2
I still prefer the flyback over the Push-Pull
Reasons:
a)The 200W limit (I have done a 500W with a few tricks) is within the reach of modern MOSFETS current wise when operating on 24VDC. (I won't go to 12V)
b) The flyback transformer construction is more simple. When operating at fairly high frequencies when you need only a few turn's on the prim, and as anybody will know that actually wound some push-pull transformers and used copper foil windings, getting a nice construction while keeping the center tapped windings balanced, as well as minimizing leakage inductances, winding resistances, insulation ...well you only know once you actually done it.
c) The flyback is inherently short-circuit proof.
d) Snubber is simple if you need one. (Push-Pull, you must be careful)
e) It needs no output inductor. Output inductor (which must sustain high voltage) also places extra caution on the diode selection on the push-pull sec side for high reverse voltages.
f) No need for HV free wheeling diode
g) You don't need any fancy control schemes
h) Better chance of first time success for the novice.
OK, you need a bigger output cap as with the other topologies but that is a small price to pay