> can anyone suggest a good, cheap, IC to make a 8..15V->300V DC-DC convert=
er?
> I wish to have about 50W output, I can go as low as 20W if necessary. It =
is
> for a CDI.
>=20
> The most important thing is not to have fancy components, transformers ar=
e
> OK as long as they're easy to wind by hand, or commercially available at =
a
> reasonable price.

Your biggest problem is the Curie point of the transformer core. Back aroun=
d the time I was finishing my apprenticeship one of the guys in the company=
 did a heap of work on designing a CDI unit. He made a transformer from a f=
errite toroid, and as we had a small environmental chamber for temperature =
testing stuff he put the unit through that. I cannot remember what temperat=
ure it would fail at, but he got the unit to a point where the limiting fac=
tor was the Curie point of the ferrite core. Just remember that things get =
very hot under the bonnet (hood) of a car!
--=20
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--=20
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