darn. Well, the Harris appnote was for the HIP4080A class-D amplifier chip that Harris (now Intersil) made. I remember reading it several years ago. When I get home I'll dig through my files, and hopefully the appnote is still there, because it provides a very good overview of class-D technology and all the equations you could stand regarding power output and efficiency etc...
I'll get back to you on this one. BTW, if anyone knows the datasheet and/or appnote I'm referring to, by all means post a link or something. I'd really like to have a copy of it for my archives (if i don't already).
I'll get back to you on this one. BTW, if anyone knows the datasheet and/or appnote I'm referring to, by all means post a link or something. I'd really like to have a copy of it for my archives (if i don't already).
I've found a few pages that might be useful. First, there's the application notes on the HIP4080 (also 4081). These are located under 'http://www.intersil.com/design/parametric/productinfo.asp?pn=HIP4080AIP'. Second, I found a schematic for the Crest LT 1000/1500/2000 Class-D amps. It's at 'http://www.crestaudio.com/media/pdf/lt_schematic.pdf'.
Good luck.
Good luck.
Welke said:
Each chip manufacturer with a Class-D driver chip will usually have some application notes posted. Both TI (TPA005, TPA032 and TPA2000) and Cirrus Logic (CS44210) have Class-D amp chips; you might want to check out their web sites.
As for the schematics, this is a result of poor website configuration. The schematics are supposed to be password protected. Crest goofed. Very few companies make this sort of information available for free, especially on a brand new product.
If you're looking for anything under a few hundred watts, the controller chips are the way to go. If you feel that you need more power (into the KW range) then you'll have to use a descrete controller instead of a chip. The crest schematic is helpful in this area.
If you're looking for a general understanding of how Class-D amps work, I have a functional diagram of a full-wave (similar to bridged) Class-D amp on the web that might help. It's at 'http://www.games.accs.com/ER/wizards/thoth/class-D.gif'. WARNING: I'm not an EE, and haven't built a Class-D amp. The diagram is based on my understanding of Class-D amp circiuts I've seen, and could be wrong.
Good luck.
hi.
we sell eval boards of the tripath and will possibly also sell eval boards of mono class-d amplifiers.
for one board (or two) i doubt it will make sense to make your own.... (yeah i know it says diy audio)
contact me for more info
bye k madsen - http://www.cadaudio.dk (km_cad@yahoo.com)
we sell eval boards of the tripath and will possibly also sell eval boards of mono class-d amplifiers.
for one board (or two) i doubt it will make sense to make your own.... (yeah i know it says diy audio)
contact me for more info
bye k madsen - http://www.cadaudio.dk (km_cad@yahoo.com)
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