IC Controlers for Class D Power stage - Page 2 - diyAudio
Go Back   Home > Forums > Amplifiers > Class D
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 12th May 2005, 09:09 AM   #11
diyAudio Member
Join Date: Apr 2004
Location: BE/NL/RW/ZA
Originally posted by frozenpod1
Does anyone know what the UCD400 uses for control is it an IC or descrete components
The comparator and the mosfet drivers are entirely discrete. In addition, the control and modulation circuit are completely passive (the amplifier is self-oscillating). There is an op amp buffer at the input.
  Reply With Quote
Old 15th May 2005, 06:43 AM   #12
diyAudio Member
Workhorse's Avatar
Join Date: Dec 2004
Originally posted by frozenpod1
In power electronic inverters 3 level modulation is almost always used.

The increase in performance at 50Hz is very large when going from 2 to 3 level.

That is why I was going to use 3 but I may have to reconsider

We also use 3 level modulation scheme in our subwoofer amp, in which switching frequency is in phase but audio signal is out of phase, in this configuration the size of output filter could be made small as compared to 2-level. And the damping factor also improves alot . it also minimises the distortion effects and eliminates bus pumping as well.
  Reply With Quote
Old 15th May 2005, 11:18 PM   #13
diyAudio Member
Join Date: May 2005
Location: Melbourne
Are you not concerend with the audio signal being out of phase as in the canceling effect with other speakers which are in phase.

Also there is a difference in the way we hear sounds wether the first peak is positive or negative air pressure, there have been test which prove there is a difference that is why it is very important to insure that the amplifier is in phase or out of phase by 360 deg.
  Reply With Quote
Old 16th May 2005, 11:16 AM   #14
diyAudio Member
Workhorse's Avatar
Join Date: Dec 2004
What i was refering to an is a bridged amp comprises of 2 half bridge Class-D amps in which the switching frequency is in phase , but the audio signal is out of phase.

Hope you understand it.
  Reply With Quote
Old 17th May 2005, 03:25 PM   #15
diyAudio Member
Join Date: Feb 2002
Location: Germany
The AD1990 - 1996 look nice enought to me. Unfortunately, they are not even in the samping stage yet.
  Reply With Quote


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
How about a round-up of Class A kit power amps, or collectable vintage class A? Brisso57 Solid State 4 14th February 2007 10:30 AM
CCS for PP Class A output stage? AudioGeek Tubes / Valves 5 24th January 2004 02:58 PM
Class A with AB Output-stage ManUtd Solid State 14 1st December 2003 05:49 PM
Hart/ Linsley Hood Phono Stage, Power Supply, Class A headphone amp vaughst Swap Meet 0 8th February 2002 10:11 PM

New To Site? Need Help?

All times are GMT. The time now is 12:55 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2