UcD like topology amp.

[Bender.ru]

Hi Eljo.

i use lm311,
idle loss (no input signal) ~3.2W with 40V per rail PSU.

 

[Eva]

Could you explain a bit the sources of THD that you have found in conventional UcD topology?

 

[Pafi]

the sources of THD that you have found in conventional UcD topology?

Have he? Have I missed something?

 

[Bender.ru]

Hi Eva!

i can't talk about the sources of THD in conventional UcD topology on the whole, but my humble experience told that main source is switching precision. Here you can see two thd figures for different dt (set by driver):

ps: loop gain ~35db

 

[acid_k2]

IE6 don't show your file .png (totally black picture)

For other forum members with the same problem:
I had to save the file and open it with a non-M$$$$soft image viewer

OT: It's time to change....

 

[Bender.ru]

jpeg file for IE6 users:

 

[Bender.ru]

thd figure with FETs shunted by RC snubbers ( 51Ohm + 220pF):
ps: dt=15nS, Rg=18Ohm

 

[domcheng]

I am planning to build a 500W class D amplifier to drive subwoofer based on this Zetex ZXCD1210. Anybody has experienced in it before?

http://www.zetex.com/3.0/product_portfolio.asp?pno=ZXCD1210

 

[Bender.ru]

Hi domcheng!
what about discussion about zetex in your own thread ?

 

[lindomar]

Very good amplifier, has the Schematic and PCB?

 

[Bender.ru]

Hi lindomar! Light version coming soon .

 

[lindomar]

Hi... Bender... and you project DAmp Version 2? Using LM319 CD4060... remember?

 

[RX5]

Bender,

hows it coming??

 

[Bender.ru]

on the way

lindomar, i haven`t enough time for my projects .

 

[Bender.ru]

Hi all.
Here is light version amp docs & pcb.
Please connect me if you find bugs.

http://ifolder.ru/6153907
(link will be available for 30 days)

http://rapidshare.com/files/107380802/Cakeamp.zip.html
(i dont know how long it will be available )

 

[RX5]

cool!

but some parts are VERY HARD to come by... almost impossible to get

 

[Bender.ru]

Hi RX5!

whta parts do you mean? i think that onle one part hard to find is doubled output fets, maybe driver.

 

[luka]

Hi

Maybe driver and AD other then that... Very nice how you made some sort of report, 10/10

 

[RX5]

Bender,

Im in the Philippines... much URBAN than other, and yeah, the real hard && impossible to get are the Dual MOSFETS, the mosfet driver and the "AD" input....

The mosfets could probably be subd with single N-Ch mosfets...

anyways, nice that you had that thing going...

how about adding a protection circuitry to it?? or how about converting the driver chip to a discrete one?


Cheers!

 

[Bender.ru]

hi Luka, thanks for reply.

i put ad825 at input, because i have ones for free
you can replace it by tl071, ne5531 or other soic8 single opamp without any perfomance derating
Most of them are pin-to-pin compatible.
It's easy to trace pcb for usual to-220 case fet, if you want, i can do it.

RX5, full discrete UcD projects: http://www.classd.fromru.com
ps: what kind of protection do you mean, OVP, UVP, OCP, OTP? my project is only simple sample of DIY amp not for commercial use.