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-   -   Checking for PCB errors (http://www.diyaudio.com/forums/class-d/154583-checking-pcb-errors.html)

Cyberzim 7th November 2009 05:06 PM

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.

m-tech 7th November 2009 08:09 PM

Analog and power ground should be connected at single point on pcb. You didn't connect them ( "-" and "GND" on your pcb ).

Cyberzim 8th November 2009 10:37 AM

So what you mean is, that analog ground and power ground is the same?

FAA 8th November 2009 10:54 AM

yes, you can also try to rotate 90deg counterclockwise the two inductors

Cyberzim 8th November 2009 03:55 PM

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

Cyberzim 11th November 2009 11:08 PM

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.

m-tech 12th November 2009 09:28 AM

This is my version www.sendspace.com/file/5g8sab

Cyberzim 12th November 2009 09:53 AM

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.


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