TPA3255 Reference Design Class D Amp GB

[Studley]

The boards are configurable in various ways. In non-PFFB mode one board can do 2 channels at 150wpc / 8 ohms

 

[tcpip]

Does using of PFFB impact the power output? I'd not realised this.

 

[Studley]

Yes because in PFFB mode the gain is reduced to 15dB (as I recall)

 

[tcpip]

What's the gain in non-PFFB?

 

[tcpip]

Ok, found this. If this is correct, the power output halves.

 

[xrk971]

Yes, choose stereo BTL mode. Requires balanced input signals though. Use BTSB for that.

 

[xrk971]

What's the gain in non-PFFB?

22dB

 

[Studley]

@tcpip; are you going to join the GB ? We need a few more to sign up !

 

[tcpip]

No, I think I'll let it pass this time. This is not connected with the power output discussions we've just had -- I think I'll look for these (awesome) amps when I'm ready to use them. I intend to use a set of them, perhaps 3-4 per speaker enclosure, to make an active speaker set. One amp per driver. Let me get the rest of the speakers ready first, then I'll come looking for amps, and I'll hope these will be available then.

 

[Studley]

Well unless we get a few more signing up it doesn’t look as though this GB will happen, so very unlikely you will be able to get the boards in the future. But if you sign you sign up for a few now . . .

 

[mahtew]

i'll add myself to the list 🙂

Studley qnty 2
DannerD3H qnty 1
jimk04 qnty 1
mahtew qnty 2

 

[xrk971]

This is looking much better.

 

[slaikan]

Is this the board with Rev 03.2020 REV002 on the silkscreen?

 

[xrk971]

Yes, this will be the rev 2 board with PFFB as an option.

Like this

 

[Studley]

Studley qnty 2
DannerD3H qnty 1
jimk04 qnty 1
mahtew qnty 2

Bump: come on people, just a few more to make this a goer.

 

[xrk971]

I’ll sweeten the deal, I’ll throw in the custom CNC heatsink adapter block for free with each board for folks in this GB.

 

[RAAM]

I will take two even though I might only use one I think I will likely build a balanced amp. I promise to not change my mind this time as I have on other projects.

I would love to have one of these, my Baby Sophia PP 10 watt tube amp and build a class A amp to play with when I finally get our RV remodel done and can start building various speakers to try out (going to build one set by this fall at the latest so I have at least something to listen to besides a great sound bar)

Rick

 

[Studley]

Great! @xrk971 have we got enough interest to make this viable for you?

 

[RAAM]

I would rather buy a finished board but if not available the bare board will just have to do though it will be some time before I can get to the build, it will be a fun challenge, been decades since I soldered a DIP chip and never those tiny bits, need a new lighted magnifier for that🙂

Rick

 

[xrk971]

The TPA3255 is kind of an advanced SMT project. I would not use it as my first SMT solder project. You need hot air soldering pencil / wand. A hotplate and skillet. An IR thermometer. Good tweezers. Solder paste applicator tool/dispenser, and solder paste, Magnifier binocular goggles. I have some Howto threads and videos that may help.