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UC3843 30W Boost problems
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ali_asadzadeh:
Thanks Tim for the feedback, certainly I want to use smaller Core,because I have limited Space, the yellow core is not ferrite!? I thought It was a ferrite core :-X

Also I want my design to self power it self from the Inductor,by using a secondary winding and I don't know how to calculate the secondary winding? So Maybe I go with an EE16 core on a transformer, is this the appropriate size core or should I go higher, Also I want to increase the frequency to 400-450KHz, is this UC3843 Reliable in this frequency?

There is one more thing though, After reaching my design goals, I want to over-derive the input till  350V, so essentially the boost would be bypassed, so the question is that, would the design survive there? I wanted it to not work at all when the input is higher than 50V ;)
strawberry:
http://www.comtrafo.com/img/cms/noticias/catalogo_foto3_nuevos_productos.pdf
oscillator dead time vs frequncy , could give some limitations at 400...450kHz
T3sl4co1l:
So, like an automotive application?  You'll need a lot more engineering to solve that reliably -- handling high input voltages can be done by adding a protection or cutoff circuit, and there are a few options depending on source, load and operating requirements.

If the input is 15V nominal, there's no need for aux power, the 3843 will run on 15V just fine.

Yellow-white is usually the color code for a mix #26 powdered iron, see www.micrometals.com.

Tim
ali_asadzadeh:

--- Quote ---So, like an automotive application?  You'll need a lot more engineering to solve that reliably -- handling high input voltages can be done by adding a protection or cutoff circuit, and there are a few options depending on source, load and operating requirements.

If the input is 15V nominal, there's no need for aux power, the 3843 will run on 15V just fine.

Yellow-white is usually the color code for a mix #26 powdered iron, see www.micrometals.com.

Tim

--- End quote ---

Really thanks for the help Tim, But it's not an automotive app ;D It's either a brilliant Idea or a poor's man way of making ultra wide input power supply ;)
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