My TPA3122D2N BTL proto - diyAudio
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Old 4th June 2008, 08:19 PM   #1
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Default My TPA3122D2N BTL proto

Seven hours later and I now have a working TPA3122D2N amplifier running BTL . I followed the eval board schematic.

This little baby is sweeeeeet. I built up a TPA1517 chipamp yesterday and this little class-d totaly crushes it. I've been running the TPA3122D2N into an 8R bridged load @ 14v for over an hour now and the thing is barely warm. I was running the TPA1517 in the same configuration yesterday and the IC got extremely hot, even after I attached a heatsink. The TPA3122D2N sounds better to my ears as well; very tight clean bass.

Now I just have to build the other channel.

1" x 2"

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Old 5th June 2008, 12:15 AM   #2
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Hi,

Very nice PCB design, I have 5 of these just sitting at home.

Nice to know that it sounds sweeeeeeet, I also built the TPA1517 (class AB IIRC) so your feedback is appreciated.

Once I complete my Amp6 that will probably be the next one in line.

Eric
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Old 5th June 2008, 06:02 AM   #3
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Quote:
Originally posted by e_fortier
Hi,

Very nice PCB design, I have 5 of these just sitting at home.

Nice to know that it sounds sweeeeeeet, I also built the TPA1517 (class AB IIRC) so your feedback is appreciated.

Once I complete my Amp6 that will probably be the next one in line.

Eric
Thanks, I utilized a continuous groundplane on the top layer and it seems to have turned out well. I have to press my ear right against the tweeter to hear any kind of background noise.

It really amazes me how cool this chip runs. It's obviously a night and day difference when compared to a linear amplifier like the TPA1517, but it also runs MUCH cooler than my AMP32. That's surprising considering it technically has lower efficiency.

This design was just to test how the small TI class-d perform. My next project will be with the TPA3106D1. It will be a bit harder to work with, but it doesn't require a differential input for BTL operation and it's capable of more power.
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Old 5th June 2008, 06:50 AM   #4
luka is offline luka  Slovenia
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Hi

NICE PCB design!! like the ground plane
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Old 5th June 2008, 08:45 AM   #5
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Default TPA3122D2N class D

Hi there mate,

Cool looking amp, looks like a simple solid solution!

Prehaps usable as a amplifier for portable solutions aswell

Well done!
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Old 5th June 2008, 10:24 AM   #6
mobyd is offline mobyd  New Zealand
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My samples of these puppies just showed up - Kudos to TI for making a switcher in a dip package. I notice that these are not rated to run 4 ohms with a 28 volt supply - anyone know if it is possible to parallel the inputs and outputs (prior to the pi network) to up the current handling (in mono, of course).
M
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Old 5th June 2008, 12:56 PM   #7
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Quote:
Originally posted by mobyd
My samples of these puppies just showed up - Kudos to TI for making a switcher in a dip package. I notice that these are not rated to run 4 ohms with a 28 volt supply - anyone know if it is possible to parallel the inputs and outputs (prior to the pi network) to up the current handling (in mono, of course).
M
I paralleled the inputs and outputs and it seems to work. If only one input is connected with the outputs paralleled the amp just clicks though. I would test it at 28v with a 4R load for you, but I built the board with 16v capacitors.
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Old 8th June 2008, 01:54 AM   #8
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I just finished making my first TPA3106D1 PCB. I've soldered the IC on, but I can't finish the board yet because I'm all out of 1uF 0805 capacitors.

There is a pad under the IC that connects to the top side ground plane both electrically and thermally. I don't have a way or method of soldering PowerPADs, so I just used a dot of thermal compound. I think with all the other pins that connect to the ground plane it should be fine.

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Old 8th June 2008, 06:16 AM   #9
luka is offline luka  Slovenia
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Hi

Thermal compound is ok....stop, let me say first: you are crazy(in a good way), those boards are killing, very nicely done!!
Maybe you will now try to make Tpa3120d2
If you have thermal pads, you could use oven, works great
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Old 8th June 2008, 12:22 PM   #10
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Default PowerPad with oven method

Hi,

In reference to a post by Luka this is a link describing how to solder PowerPad via the oven method.

http://www.seattlerobotics.org/encod...6/oven_art.htm

Regards,
Eric
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