Apparently Maxim designed this family to have the feedback taken from
the input side of the inductor. Supposedly this helps keep the feedback
loop stable with either ceramic or electrolytic capacitors and also
introduces some inherent load regulation from the added DC resistance of
the inductor.
Like I said, I'm not an analog person at all and I really don't feel
like digging out my old books to determine whether they are right,
wrong, or otherwise. :)
Patrick M
Jack Carroll wrote:
On Wed, Sep 28, 2005 at 06:12:37PM -0400, Joshua Wise wrote:
15A is a lot of current.
Have you looked at:
http://www.maxim-ic.com/cookbook/powersupply/index.cfm?order=part (the
"power-supply cookbook")
http://pdfserv.maxim-ic.com/en/ds/MAX8576-MAX8579.pdf (the datasheet)
?
That feedback looks really weird to me, though. Perhaps you just want a
simple resistor divider hanging off the output, as opposed to sitting in
before the inductor.
I don't even have to look at the schematic to know that's correct.
This is a simple buck regulator, right? The feedback is taken across the
output capacitor, after the inductor.
I'd suggest downloading the data sheet for the National LM2675.
That's full of all kinds of good advice about how to design a buck
regulator, and lay out the board correctly. It's worth studying with great
intensity. Parts placement and the routing of the high-current loop are
_really_ critical.
Wish I had time to help more with this, but the new job is keeping
me busy.
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