Help, improvement class D - diyAudio
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 27th June 2010, 09:26 AM   #1
diyAudio Member
 
Join Date: Nov 2004
Location: Bucharest
Default Help, improvement class D

Hello, this is a diagram of an car amplifier.
I want to make some changes to improve this scheme, the high size is hot (60-70 degrees on transistor without heatsink ) without loud on the output
What changes do suggest, please draw on the diagram.
Thanks in advance !
Attached Images
File Type: jpg 2.JPG (128.1 KB, 213 views)
  Reply With Quote
Old 27th June 2010, 02:06 PM   #2
Pafi is offline Pafi  Hungary
diyAudio Member
 
Join Date: May 2004
Location: Budapest
R191 is huge, and you should have drive upper gate with higher voltage then source voltage, and source voltage has to reach Vpp!

Learn from UcD!

Last edited by Pafi; 27th June 2010 at 02:11 PM.
  Reply With Quote
Old 27th June 2010, 02:37 PM   #3
diyAudio Member
 
Join Date: Nov 2004
Location: Bucharest
My mistake, in schematic of this amplifer are many mistakes.
I think this is the right !
Thx Pafi !
I do not like waveform on final mosfet, what changes need to bring for a good waveform for the final mosfet
Attached Images
File Type: jpg 3.JPG (129.2 KB, 186 views)

Last edited by mgm2000ro; 27th June 2010 at 02:43 PM.
  Reply With Quote
Old 27th June 2010, 03:51 PM   #4
AP2 is offline AP2  Italy
Banned
 
Join Date: Dec 2009
Location: Italy
Hi,after see scheme,carrier freq. and 12Kpf of gate driving for side.
not is possible simple modify (my opinion).
only hard modify I think. change operational,remove pair of BJT driver and replace it with 4xtc4426 chip. this can driver a pair of mosfet for solve current necessary of gate.
  Reply With Quote
Old 27th June 2010, 03:55 PM   #5
Pafi is offline Pafi  Hungary
diyAudio Member
 
Join Date: May 2004
Location: Budapest
Try to remove some MOSFETs, and decrease R191!
  Reply With Quote
Old 27th June 2010, 04:06 PM   #6
diyAudio Member
 
Join Date: Nov 2004
Location: Bucharest
Thank you very much, Pafi & AP2, i will return with some pictures.
  Reply With Quote
Old 27th June 2010, 04:17 PM   #7
AP2 is offline AP2  Italy
Banned
 
Join Date: Dec 2009
Location: Italy
Hi,
for precision is TC4427 (non inverting).
very simple change with it. 2 for side and...FLY.
  Reply With Quote
Old 27th June 2010, 07:48 PM   #8
Pafi is offline Pafi  Hungary
diyAudio Member
 
Join Date: May 2004
Location: Budapest
Sorry for OFF!

AP2! Please tell me you are learning english!
  Reply With Quote
Old 28th June 2010, 06:03 AM   #9
AP2 is offline AP2  Italy
Banned
 
Join Date: Dec 2009
Location: Italy
Quote:
Originally Posted by Pafi View Post
Sorry for OFF!

AP2! Please tell me you are learning english!
now I speak perfect English.
I mean it is easy to replace the driver stage with TC4427 (2 x side).
  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
Improvement on Epos's Holty Full Range 3 11th January 2007 06:35 PM
Cheap improvement Yonnat Pass Labs 10 22nd December 2003 12:46 AM
suggestions for improvement wintermute Solid State 12 10th September 2003 02:52 AM


New To Site? Need Help?

All times are GMT. The time now is 06:57 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