Help with my D class Amp

[Fillout]

Hi ALL

I want to create D class amp by my circuit (see attach.)

But there are 2 questions:
1)What about output FETs & driver? Will it work under 100 kilohertz?
2) What is the best way to make PWM controller?

P.S. This will be powerful (900w) amp for subwoofer.

 

[IVX]

Where your attachment?

 

[Fillout]

An externally hosted image should be here but it was not working when we last tested it.

Here the links
ftp://ftp.orexovo.pike/incoming/new_1.GIF
http://fillout1.narod.ru/new_1.GIF

 

[IVX]

IMHO, H-bridge with 4*irf540n(or irfb52n15 for HUGE power) will be better and cheaper. The best modulator is UcD indeed, or a SODA fashion (which used by me for subamp also).

 

[Fillout]

IVX
H-bridge with 4*irf540n
And driver?As i know ir2104 is H-Bridge

The best modulator is UcD indeed, or a SODA fashion (which used by me for subamp also).
Can you give me some links? or a part of scheme?

 

[IVX]

And driver too. Try the search for "UcD"(22 threads):
http://www.diyaudio.com/forums/search.php?s=
My russian page:
http://amploid.narod.ru/

 

[Fillout]

As I understand IRF540n better,cause QG=47.3,and it is the main problem of IRFP260n?


And driver too. Try the search for "UcD"(22 threads):
Thanks


About your AMP.
I calculate that the power is about
Pout~=600w @2 Ohm, or more - is it true?

I = P/U = SQRT(P/R)=17A
Ptemp=Pout*(1-n/100)=600*0.06=36w
So what about heatsinks.
Can I try your amp,because I have already spent a lot of money for my variants of D-class AMP

 

[IVX]

More powerful driver such as ir2184 should be working well with irfp260 charges, however body diode ~3 times slower vs irf540, and i haven't 200V(!!!) schottki yet. Why do you need such power amount? Did you hear 500W at 15" 93db@1W/M? (Mom too?;-) About heatsink, actually PCB 110x110mm screwed to the aluminium plate 110x110x12mm, all this is placed into the speaker box closer to the vent port.

 

[Fillout]

Did you hear 500W at 15" 93db@1W/M
Really-no, I have 12" 92db@1w/m 900w RMS 1800w MAX.

such as ir2184 should be working well with irfp260 charges
So,if I use ir2184 driver & irfp260 i can use your amploiD circuit with my irfp260n, of course also with more powerfull dc-convertor,with no changes in amp? And why did your need bc817/bc807 after driver?

can we talk by icq?

 

[IVX]

can we talk by icq?

Ok, or mailto: amploid at yandex.ru BTW nice font and color!