30 Watt Class D IC that uses a single rail

Maroc7 · 9th March 2009, 03:23 PM

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?

kenpeter · 10th March 2009, 12:07 AM

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.

theAnonymous1 · 10th March 2009, 12:23 AM

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

Maroc7 · 12th March 2009, 03:32 PM

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.

sparpacillon · 28th March 2009, 02:24 PM

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

9th March 2009, 03:23 PM	#1
Maroc7 diyAudio Member Join Date: Mar 2009	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?

10th March 2009, 12:23 AM	#3
theAnonymous1 diyAudio Member Join Date: Feb 2004 Location: Anonymityville	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 __________________ "If you don't like funerals don't kick sand in Ninja's face." - Ninja

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10th March 2009, 12:07 AM	#2
kenpeter diyAudio Member Join Date: Nov 2007 Location: Dallas	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.

12th March 2009, 03:32 PM	#4
Maroc7 diyAudio Member Join Date: Mar 2009	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.

28th March 2009, 02:24 PM	#5
sparpacillon diyAudio Member Join Date: Mar 2009	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