N. Thornton said:
My only ssuggestion would be to ask less vague qs
Okay, let me try, since I have what I think is essentially the same question
as the OP:
I'd like to design class D audio amplifiers, capable of several hundred
watts or possibly up to 1kW, with THD+N less than 0.1% at rated power. Of
course I don't expect to get there in one step, but it's the eventual goal.
Commercial manufacturers have obtained this, so it is possible.
As an initial goal, I'd like to design a decent-sounding and reliable 20W
(avg continuous 1kHz sinewave) audio amp with THD+N < 0.25% (1kHz,
unweighted, 20Hz-80kHz) into 8 ohms. But I'd like to understand what I'm
designing: I don't just want to plug in an eval board and call it done,
because I won't have learned anything.
However, I have no experience with class D at all.
Are there any textbooks and/or good tutorials that cover the topics relevant
to designing class D amps? I am aware that there are some manufacturer app
notes for IC-based solutions, but I would prefer information that was more
thorough in its coverage and less biased toward particular solutions.
If there are not any such texts, can anyone **with practical experience in
this area** recommend a preferred design approach, or some preferred
manufacturers to start with? For instance, will I likely get farthest
working with discrete components, or should I base my designs around one of
the chips by Zetex or TI or such? What might the tradeoffs be, and are
there particular dead-end alleys I should be careful to avoid?
Thanks for any advice you can give me.
-walter