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Class D Switching Power Amplifiers and Power D/A conversion

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Old 22nd June 2004, 09:46 PM   #1
Bricolo is offline Bricolo  France
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Default Class D beginner, where to start?

Hi all,


I'd like to make a PA amp fir a friend, and class D amps look nice for that. Not very expensive, small size, small heatsinks.

But I've never worked with class D, where should I start?

Thanks
Alex
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Old 23rd June 2004, 10:58 AM   #2
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no one?
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Old 23rd June 2004, 12:27 PM   #3
Pafi is offline Pafi  Hungary
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Hi!

You should try something simple first! Self-oscillating topology with complementary MOSFET output would be fine.
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Old 23rd June 2004, 12:37 PM   #4
Bricolo is offline Bricolo  France
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I was more thinking about starting with the theory

How does it work, what topologies exist (the advantages and drawbacks of each), how to build one (which chips?)

Some kind of tutorial.

I've browsed some manufacturers websites, but didn't find much.
Linear: found ,othing
National: has 1 class D amp
Onsemi: nothing above 1W
TI: nothing above 20W
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Old 23rd June 2004, 12:54 PM   #5
Electrons are yellow and more is better!
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Kolla Harris/Intersil, possible also IR.
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Old 23rd June 2004, 01:13 PM   #6
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I must be blind, I found nothing on theyr websites (and don't know what kolla is)
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Old 23rd June 2004, 01:29 PM   #7
Pafi is offline Pafi  Hungary
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There were posted many links recently.

Theory:
http://www.irf.com/product-info/audi...sdtutorial.pdf

And a "book":
Title: High Efficiency Audio Power Amplifiers; design and practical use
Author: Ronan van der Zee
ISBN: 90-36512875
(I loaded it down from intrnet, but don't know where.)

Devices:
philips (TDA8920 2*80W PWM amp IC)
www.tripath.com (PWM controllers+drivers up to ~2kW)
www.intersil.com (drivers)
www.irf.com (drivers+MOSFETs)
www.advancedpower.com (MOSFETs)

etc...
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Old 23rd June 2004, 01:34 PM   #8
Electrons are yellow and more is better!
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Quote:
Originally posted by Bricolo
I must be blind, I found nothing on theyr websites (and don't know what kolla is)

Kolla, sorry a swedish word.... = check

kolla = kollationera = collate
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Old 23rd June 2004, 05:44 PM   #9
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Default Class D amps

If you're a beginner, first build an amp someone else designed. There are too many heart breaks in making the first amp you ever build one that you try to design. There are several good schematics available at www.schematicsforfree.mattsoft.net in the audio circuits section.
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Old 23rd June 2004, 06:38 PM   #10
Bricolo is offline Bricolo  France
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the "audio schematics and manuals" li,k doesn't work
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