Go Back   Home > Forums > Amplifiers > Class D

Class D Switching Power Amplifiers and Power D/A conversion

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 7th October 2007, 10:12 AM   #1
Electrons are yellow and more is better!
diyAudio Member
 
peranders's Avatar
 
Join Date: Apr 2002
Location: Göteborg, Sweden
Blog Entries: 4
Default New Class D design

Anybody who have checkec this out?
http://www.irf.com/technical-info/re.../iraudamp4.pdf
__________________
/Per-Anders (my first name) or P-A as my friends call me
Tube Buffered Gainclone in work |Thread || Diamond buffer |Thread for the group buy | Wiki
  Reply With Quote
Old 8th October 2007, 07:40 AM   #2
diyAudio Member
 
Join Date: May 2002
Location: Switzerland
Old-fashioned non-post-filter NFB type amplifier.

Regards

Charles
  Reply With Quote
Old 8th October 2007, 08:13 AM   #3
IVX is offline IVX  Russian Federation
diyAudio Member
 
IVX's Avatar
 
Join Date: Jul 2003
Location: Everywhere (Buddhist's context)
Default Re: New Class D design

Quote:
Originally posted by peranders
Anybody who have checkec this out?
http://www.irf.com/technical-info/re.../iraudamp4.pdf

now the new is http://www.irf.com/technical-info/re.../iraudamp5.pdf
__________________
Best regards,
E1.
  Reply With Quote
Old 8th October 2007, 12:18 PM   #4
diyAudio Member
 
Join Date: May 2002
Location: Switzerland
Ahhhhh ! There is even a newer boring design without post-filter NFB !

Regards

Charles
  Reply With Quote
Old 8th October 2007, 06:35 PM   #5
Eva is offline Eva  Spain
diyAudio Member
 
Eva's Avatar
 
Join Date: Oct 2003
Location: Near the sea
Send a message via MSN to Eva
Hey, but look at the schematics, they have migrated to a phase-shifted self oscillating arrangement, in such a way that modifying it for post-filter feedback is trivial.

What they have done at IR is essentially a single-chip UcD solution It only lacks the balanced inputs...
__________________
I use to feel like the small child in The Emperor's New Clothes tale
  Reply With Quote
Old 9th October 2007, 06:41 AM   #6
diyAudio Member
 
Join Date: May 2002
Location: Switzerland
Quote:
in such a way that modifying it for post-filter feedback is trivial.


http://www.diyaudio.com/forums/showt...789#post825789

Regards

Charles
  Reply With Quote
Old 9th October 2007, 07:18 AM   #7
diyAudio Member
 
Ouroboros's Avatar
 
Join Date: Dec 2003
Location: Nottingham UK
I've been looking at the IRS2092 data (as published so far) to see if it could be used to implement a UCD-style circuit. The input op-amp is internally coupled to the comparator stage, which is unfortunate, but the input op-amp is a transconductance amplifier, so it might just be possible to couple in the feedback to the op-amp/comparator junction to get a phase-shift 'UCD' style self-oscillator.

I've got a chap coming in to see me from 'Future Electronics' (A big UK distributor) tomorrow about this chip, so I'll try to scrounge a few parts to try it out.
  Reply With Quote
Old 9th October 2007, 07:44 AM   #8
IVX is offline IVX  Russian Federation
diyAudio Member
 
IVX's Avatar
 
Join Date: Jul 2003
Location: Everywhere (Buddhist's context)
Ouroboros, i've a doubts about such solution:
A) it seems ir ref. designs hasn't good precision of switching.
B) internal comparator isn't differential.
__________________
Best regards,
E1.
  Reply With Quote
Old 9th October 2007, 07:51 AM   #9
diyAudio Member
 
Ouroboros's Avatar
 
Join Date: Dec 2003
Location: Nottingham UK
Hello Ivan. Yes the fact that the comparator isn't differential is an issue. I've not had the time to study the chip yet, but at a glance it seems that to apply UCD style feedback directly into the input of the comparator would require that the feedback went to the + input of the comparator (which isn't accessible).
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Class D amp design Thys Class D 1 20th July 2007 09:45 PM
Hybrid Class A / Class B design. GK Solid State 27 1st January 2007 02:30 AM
class H design csl113 Solid State 5 23rd June 2006 05:53 PM
My 50W class A design! PanzerLord Solid State 90 11th August 2004 06:17 PM


New To Site? Need Help?

All times are GMT. The time now is 07:00 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2