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Old 9th March 2009, 03:23 PM   #1
Maroc7 is offline Maroc7  England
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Default 30 Watt Class D IC that uses a single rail

Hello everyone

I am a newcomer to the world of class D amplifiers and I wonder if anyone can help me with the following.

I need to build a mono amplifier with an analogue input, preferably balanced, that can deliver around 30 watts into an 8 ohm load using a single rail supply. There is no room for a large heatsink, hence Class D, and it would also be nice if it was easy to mount i.e. utilises a Flexiwatt or Multiwatt package or similar (my eyesight is not what it was!)

Can anyone suggest a suitable IC that is readily available?
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Old 10th March 2009, 12:07 AM   #2
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tpa3122d2 from TI. Its a 20Pin DIP, package couldn't be easier.
It runs pretty cool. But I'd still solder it down, rather than trust
a socket to keep it that way.

Actually 15W per channel stereo, but will drive 30W mono bridge.
In mono bridge, the inputs are differential, just as requested.
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Old 10th March 2009, 12:23 AM   #3
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It would be more like <20W into 8R BTL. I would never even consider placing it in a socket for thermal and stability reasons. It's designed to be directly soldered to the PCB.

Here is the TPA3122D2 board I built......

My TPA3122D2N BTL proto
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Old 12th March 2009, 03:32 PM   #4
Maroc7 is offline Maroc7  England
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Thanks to kenpeter and theanonymous1 for the information, it has saved me a lot of time searching for a suitable device.

I have just downloaded the datasheet for the TPA3122D2 and it seems ideal - in fact it seems to good to be true!

I am of an age that I still find it amazing that these devices can be so efficient that they don't require a significant external heatsink.
I look forward to seeing how well it performs ...

Thanks again.
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Old 28th March 2009, 02:24 PM   #5
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hey friends, i want to build an amp with the same specs than MAROC7.
Any of you can send me where to give schematic (or even.. pcb!) for a SIMPLE (i'm not so expert, only enthusiast) d-amp using TPA3122D2N , in BTL mode? i know that i should not ask, but i hope that someone want to give me an hand.
i saw the prototype by theAnonymous1 and is really fantastic!
thank you guys
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