Thank you Bob,

I will try with your experienced power supply.

Kind regards, from the end of the world....

Pablo Ginhson
 =

> From: bobblick@ftml.net
> To: piclist@mit.edu
> Subject: RE: [EE], MC34063 for 20A
> Date: Fri, 31 Jul 2009 14:31:28 -0700
> =

> =

> On Fri, 31 Jul 2009 21:08:01 +0000, "Pablo Ginhson"
> <pginhson@hotmail.com> said:
> > =

> > What I need is a DC-DC converter for 17A for only the first 1 minute,
> > then the system will need only 5A
> > =

> > Vdc input 24 V from 2 batt (truck) VDC output 24V. I know that is
> > dificult to make a DC DC with the same input and output, I think that I
> > can use a Boost-buck configuration for this.
> > =

> > Any suggestions?
> =

> Hi Pablo,
> =

> It's real easy if you are good with magnetics. Here's a design I did
> with the UC3843 and SEPIC topology which is ideal when the input and
> output are similar voltages. You will of course need to remove the +5V
> section and modify the turn-on section and scale the whole thing up to
> your voltage and current, but the basic schematic can remain the same:
> =

> http://bobblick.com/techref/projects/mp3book/mp3book.html
> =

> Cheerful regards,
> =

> Bob
> =

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