TPA3121 problems - 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 15th January 2010, 12:26 AM   #1
diyAudio Member
 
Join Date: Apr 2009
Default TPA3121 problems

Hello,
I have attemped to make a pcb for tpa3121, but not with success.
So I would be very happy if you maybe could find some errors in my design.
My first attempt at making the board went very well, no shorts at all and everything was connected where they should. The only problem was, that the amplifier almost gave me none output. You could hear little of the music, so I measured the voltage on the pin called "High voltage power supply" and it was zero, so while it was turned on, I just made with a connection with a wire from positive supply to the pins and then it died
I have one last try, so I will post datasheets and pcblayout and cross my fingers for, that you can help me with this problem.

PCB: Imageshack.dk
Datasheets: http://focus.ti.com/lit/ds/symlink/tpa3121d2.pdf

Regards,

Simon H.A.
  Reply With Quote
Old 15th January 2010, 10:05 AM   #2
m-tech is offline m-tech  Serbia
diyAudio Member
 
Join Date: Feb 2006
Location: Belgrade
Looking at picture everything is OK but, can you show us your pcb ? Some connections are very close to each other so you might have unwanted short's.
What is "High voltage power supply" ?
AVCC and PVCC should be connected to same power supply. If they are not you need to think about mute and shutdown pin because they have compliance to AVCC.

Last edited by m-tech; 15th January 2010 at 10:08 AM.
  Reply With Quote
Old 15th January 2010, 10:07 AM   #3
diyAudio Member
 
Join Date: Apr 2009
When I get home form school, I will upload a picture of the board.

Regards,

Simon H.A.
  Reply With Quote
Old 15th January 2010, 11:10 AM   #4
diyAudio Member
 
Join Date: Apr 2009
I will also make a new board with more spacing between the connections to be more sure, that there will be no short circuits.
  Reply With Quote
Old 15th January 2010, 06:50 PM   #5
diyAudio Member
 
Join Date: Apr 2009
Here is the picture of the board.
I have reconized that the copper gets miscolored from my fluxpen, is there a way to remove it without harming the components?

Imageshack.dk

Regards,

Simon H.A.
  Reply With Quote
Old 15th January 2010, 07:52 PM   #6
diyAudio Member
 
theAnonymous1's Avatar
 
Join Date: Feb 2004
Location: Anonymityville
You should really try and clean the flux off the board, it's a bit of a mess.
  Reply With Quote
Old 15th January 2010, 07:53 PM   #7
diyAudio Member
 
Join Date: Apr 2009
It's water soluble, can I just use that for cleaning the board?
  Reply With Quote
Old 15th January 2010, 07:55 PM   #8
diyAudio Member
 
theAnonymous1's Avatar
 
Join Date: Feb 2004
Location: Anonymityville
I would use distilled if possible, and get in there around the chip with a toothbrush. Make sure it's completely dry before powering it up.

No isopropyl alcohol or acetone around?
  Reply With Quote
Old 15th January 2010, 08:14 PM   #9
Pano is offline Pano  United States
diyAudio Moderator
 
Pano's Avatar
 
Join Date: Oct 2004
Location: Kona, Hawaii
Blog Entries: 4
If you use alcohol, use the good stuff. It seems that all you can get in the drug store and supermarkets now in the US is 70%. Doesn't work worth a darn.

The stuff that comes in a can at the hardware store is much better. Don't know what they sell in Danmark.
__________________
Big Altec Moving Sale!
  Reply With Quote
Old 15th January 2010, 08:15 PM   #10
diyAudio Member
 
Join Date: Apr 2009
I have 93% at my home, so that should do it.

Regards,

Simon H.A.
  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
Problems Markz66mustang Car Audio 14 28th December 2004 07:04 AM
will this cause problems? slackerbob Multi-Way 9 29th November 2003 08:25 PM


New To Site? Need Help?

All times are GMT. The time now is 09:45 AM.


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