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Old 27th July 2004, 09:45 AM   #1
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Default Help with my D class Amp

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.
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Old 27th July 2004, 06:54 PM   #2
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Where your attachment?
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Old 27th July 2004, 07:36 PM   #3
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Click the image to open in full size.

Here the links
ftp://ftp.orexovo.pike/incoming/new_1.GIF
http://fillout1.narod.ru/new_1.GIF
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Old 27th July 2004, 09:50 PM   #4
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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).
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Old 27th July 2004, 10:16 PM   #5
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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?
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Old 27th July 2004, 11:10 PM   #6
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And driver too. Try the search for "UcD"(22 threads):
http://www.diyaudio.com/forums/search.php
My russian page:
http://amploid.narod.ru/
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Old 28th July 2004, 10:36 AM   #7
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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
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Old 28th July 2004, 04:54 PM   #8
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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.
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Old 28th July 2004, 07:04 PM   #9
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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?
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Old 30th July 2004, 04:14 PM   #10
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Quote:
can we talk by icq?
Ok, or mailto: amploid at yandex.ru BTW nice font and color!
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