At 22.54 2011.08.07, you wrote:
>Em 7/8/2011 14:23, Electron escreveu:
>> Hi,
>> can anyone suggest a good, cheap, IC to make a 8..15V->300V DC-DC conver=
ter?
>> I wish to have about 50W output, I can go as low as 20W if necessary. It=
 is
>> for a CDI.
>
>
>Is the 300V to charge the capacitor to be discharged into the ignition
>coil? That seems a lot of power just for the spark.
>
>How many cylinders your CDI will ignite? I once designed a CDI using a
>small 1 cubic cm ferrite transformer switched by a single MOSFET. I
>don't remember the details, but it used much less power.

Well, 300V^2*3.3uF*0.5 is 148.5mJ, it's a good spark but it's useful as it'=
s a
racing 2 stroke engine where fouled plugs are not so rare, etc..

148.5mJ*13000 RPM =3D ~32W

And this is just for 1 cylinder..

Greets,
Mario

>
>Isaac
>
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