Looking for a CLASS D amplifier design .

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That's what annoys me maybe most, there are not really any DIY class-d amp "kits" or complete project pages. And no-one appears to have e.g. complete-and-working Eagle schematics and PCB designs. 😡 (unlike "analog" amps where tens to hundreds of very good and documented kits/projects are available)

You could try googling for "class-d reference design", although these are sometimes based around some hard to get proprietary IC.

Some links:

http://www.irf.com/technical-info/refdesigns/audiokits.html
http://www.irf.com/technical-info/refdesigns/iraudamp1.pdf
(schematics and layout, but no PCB)

http://www.zetex.com/audio/audio04_3.asp
http://www.zetex.com/audio/audio05-1-5.asp
(for low-power ones, schematics and PCB)

and for example the ZXCD1000 datasheet
http://www.zetex.com/audio/audio05-1-2a.asp

Max output power is basically determined by the voltage of the voltage supply that feeds the full/halfbridge. With some reference designs like zetex ones you may get lucky by simply increasing the rail voltages (and maybe swap mosfets for higher voltage ones).

- Jan
 
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