ucd 25 watts to 1200 watts using 2 mosfets - Page 448 - 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
Reply
 
Thread Tools Search this Thread
Old 11th January 2017, 12:12 PM   #4471
diyAudio Member
 
Join Date: Aug 2012
Quote:
Originally Posted by kees52 View Post
Here she are.
Hi there are no S and BAL pins on the 311 spices
  Reply With Quote
Old 11th January 2017, 01:45 PM   #4472
diyAudio Member
 
Join Date: Aug 2012
Tried simulating but im getting error as there are no lib files for the IR2110
  Reply With Quote
Old 11th January 2017, 02:02 PM   #4473
kees52 is offline kees52  Netherlands
diyAudio Member
 
Join Date: May 2009
Location: Sprang-capelle Holland.
Quote:
Originally Posted by rhythmsandy View Post
Tried simulating but im getting error as there are no lib files for the IR2110
I did have the same, and I have the lib and sub, here she are, maybe you can find out, ltspice is sometimes difficult.

you can use .include IR21XX.lib but I did see I have a error with pins.
Attached Files
File Type: zip ltspice-lib.zip (10.3 KB, 25 views)
  Reply With Quote
Old 11th January 2017, 02:29 PM   #4474
kees52 is offline kees52  Netherlands
diyAudio Member
 
Join Date: May 2009
Location: Sprang-capelle Holland.
Quote:
Originally Posted by rhythmsandy View Post
wow thank you will post some sims soon.
I have a question about the Class D for subwoofer application. Do they have stability issues when either load is not connected or for extreme low frequencies?

The fundamental reason why i want to consider the full bridge and single supply is to avoid the bus pumping effect and i believe this circuit is also with post feedback so the DF could be more.

Did anyone tried this UCD with subwoofers with extreme usage in like PA with good results? I want to drive 21LW1400 from eighteen sound with excellent grip.
I believe full bridge do also not have problems with bus pumping.

here some info.

http://www.irf.com/product-info/audi...utorial606.pdf
  Reply With Quote
Old 11th January 2017, 05:00 PM   #4475
Pafi is offline Pafi  Hungary
diyAudio Member
 
Join Date: May 2004
Location: Budapest
Quote:
Originally Posted by kartino View Post
In class D clipping sounds worse.

As I told before that during momentary clipping for self oscillating class D, PWM will stop for a moment and only pure DC will flow to speaker. And after clipping, it needs time to restart again the PWM. This event makes clipping in class D is worse than class AB.

It seems you don't have experience at all.
Experience is your privilege. Nobody else has it, unless he agrees with you.

ClassD clipping sound worse only if you make it wrong. If you do it right it returns to normal operation immediately after clipping. I also fallen to this error in my first big classD amp, but I didn't accept it, found the problem and corrected it.
  Reply With Quote
Old 11th January 2017, 05:09 PM   #4476
stewin is offline stewin  Kenya
diyAudio Member
 
Join Date: Jul 2007
Quote:
Originally Posted by Dimonis View Post
I have many working projects , but they are mostly not UcD based . I don't like UcD - due to it's low loopgain it has heightened distortion , and if increase loopgain - it becomes unstable. I only use UcD for high (>1000W) power subamps, where THD is not the main criterion . And due to postfilter feedback can use less expensive output inductor, something like sendust ring cores....

Here is my old UcD bridge , cliplimiter on board.
thanks dimonis for sharing .nice layout .please post schematic of the project.

by the way which topology do you use nowadays of your class d amps??
  Reply With Quote
Old 11th January 2017, 05:43 PM   #4477
diyAudio Member
 
Join Date: Aug 2012
tried simulating but Im getting a squarewave at the High input and low input.
Attached Images
File Type: png ClassD_notworking.png (77.4 KB, 303 views)
File Type: png ClassD_notworking_High_LowIN.png (70.1 KB, 293 views)
  Reply With Quote
Old 11th January 2017, 05:45 PM   #4478
diyAudio Member
 
Join Date: Aug 2012
ltspice file
Attached Files
File Type: asc 002_ClassD_UCD_Style.asc (14.5 KB, 50 views)
  Reply With Quote
Old 12th January 2017, 01:55 AM   #4479
diyAudio Member
 
Join Date: Aug 2012
can anybody please tell me whats wrong in the schematic?
  Reply With Quote
Old 12th January 2017, 06:22 AM   #4480
Pafi is offline Pafi  Hungary
diyAudio Member
 
Join Date: May 2004
Location: Budapest
Quote:
Originally Posted by rhythmsandy View Post
can anybody please tell me whats wrong in the schematic?
Probably the input polarity of comparator. The polarity definition changes when you use the other output.
  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
Philips 40/25/15 watts amplifier with Universal preamplifier circuit. renjiish Solid State 94 16th February 2017 11:16 AM
Decibel Watts VS Watts ? fivestring Solid State 11 1st April 2009 01:08 PM
AMP1-B: why only 25 watts @8ohms? theAnonymous1 Class D 10 15th August 2005 06:55 PM
Sound quality of amps at 0.3 watts vs @ typical 5 watts rick57 Solid State 2 26th March 2005 06:25 AM
Need 2 watts Vivek Everything Else 4 17th July 2003 08:29 AM


New To Site? Need Help?

All times are GMT. The time now is 11:03 AM.


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
Wiki