Checking for PCB errors - 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 7th November 2009, 06:06 PM   #1
diyAudio Member
 
Join Date: Apr 2009
Default Checking for PCB errors

Hi there,
I have made a pcb layout for a tpa3122 amplifier.
My problem is, that the last board I made costed me 4 of these amps since I had some errors and so on, but now I think I have fixed all the errors, but I would really appreciate if you could just use a bit of your time to look on my pcb and see if you can find any errors.
Here is link for datsheet, and you will find the schematic under "Application Information" http://focus.ti.com/lit/ds/symlink/tpa3122d2.pdf
Here is the pcb: Imageshack.dk
The yellow lines are jumpers.
I can't afford any more mistakes

Thank you,

Simon H.A.
  Reply With Quote
Old 7th November 2009, 09:09 PM   #2
m-tech is offline m-tech  Serbia
diyAudio Member
 
Join Date: Feb 2006
Location: Belgrade
Analog and power ground should be connected at single point on pcb. You didn't connect them ( "-" and "GND" on your pcb ).
  Reply With Quote
Old 8th November 2009, 11:37 AM   #3
diyAudio Member
 
Join Date: Apr 2009
So what you mean is, that analog ground and power ground is the same?
  Reply With Quote
Old 8th November 2009, 11:54 AM   #4
FAA is offline FAA
diyAudio Member
 
FAA's Avatar
 
Join Date: Oct 2009
yes, you can also try to rotate 90deg counterclockwise the two inductors
  Reply With Quote
Old 8th November 2009, 04:55 PM   #5
diyAudio Member
 
Join Date: Apr 2009
I fixed the "gnd" and "-" together to one point so there should not be anymore errors.
Here is the new layout.
Is it correct now? If it is then I will etch a new board and test it for results.

Thank you,

Simon H.A.

http://imageshack.dk//viewimage.php?...e/TDA99277.png

Last edited by Cyberzim; 8th November 2009 at 05:13 PM.
  Reply With Quote
Old 12th November 2009, 12:08 AM   #6
diyAudio Member
 
Join Date: Apr 2009
I've burned my last chip, so I will order new chips and go back to breadboard again.
I found a picture of my breadboard setup, and the Analog Ground was separated, so that power ground was the negative supply and analog ground was ground as you know with analogs.
When I get the same performance again as I did with my breadboard I will make a new pcb and try again
This is getting expensive

Simon H.A.
  Reply With Quote
Old 12th November 2009, 10:28 AM   #7
m-tech is offline m-tech  Serbia
diyAudio Member
 
Join Date: Feb 2006
Location: Belgrade
This is my version www.sendspace.com/file/5g8sab
  Reply With Quote
Old 12th November 2009, 10:53 AM   #8
diyAudio Member
 
Join Date: Apr 2009
Thanks for the post !
I have one question about the schematic. I'm often confused by the ground.
Is the ground in this schematic the negative supply? you know if we say we use +/- supply

Thank you,

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
15W kit schematic errors! N9VOC Chip Amps 5 24th February 2012 10:28 PM
First PCB Design. Any Errors? BubbaGump Chip Amps 5 13th August 2007 08:12 PM
Errors with DIY JLTi schematic DragonMaster Chip Amps 0 6th May 2006 02:54 PM
need help in correcting errors urgently weifeng Parts 5 13th February 2006 01:54 AM
denon dcd-485 cd errors hlp req plz fender62 Digital Source 1 15th August 2005 02:48 AM


New To Site? Need Help?

All times are GMT. The time now is 05:49 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