piclist 2001\01\19\172102a >
Thread: Design challenge - switching regulator
www.piclist.com/techref/power/priswitch.htm?key=switching
picon face BY : Peter L. Peres email (remove spam text)



Add a small self-oscillating converter to the auxiliary supply of the 384x
to supply its 12V supply until the circuit starts properly. The converter
should have double switchoff, once by the function of the main converter,
and once by the primary voltage being higher than say 12V.

I have done similar things, though lower powered, and discrete (no IC).

imho the transformer is very poorly used if it is to span the entire
voltage scale you indicate. Usually in these cases there are two or more
primaries and primary drive circuits, one for each range, with separate
inputs.

Peter

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