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Class D Switching Power Amplifiers and Power D/A conversion

Stereo monoblocks - 3255 or irs2092
Stereo monoblocks - 3255 or irs2092
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Old 12th October 2019, 10:05 AM   #11
grahamgraham is offline grahamgraham  United Kingdom
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Quote:
Originally Posted by jimk04 View Post
The above link Graham in XRKs previous post.
Thanks, I did not think he was referring to his own design.

Xrk, was there another finished board you were referring to?
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Old 12th October 2019, 10:17 AM   #12
jimk04 is offline jimk04  United Kingdom
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I believe X was not wishing to push his own product. So hats off to him for that. But the link was indeed referring to his PCB and the previous comment about chockes and PFFB are areas he has paid a lot of attention to.
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Old 12th October 2019, 07:55 PM   #13
dzwer is offline dzwer  Bulgaria
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Quote:
Originally Posted by xrk971 View Post
I did not measure the ripple out of the SMPS itself but observed that the TPA3255 had a -120dB noise floor with it as the power supply. Moreover, the amp was silent with ear pressed to speaker - consistent with measured -120dB noise floor of amp.
Thanks!
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Old 12th October 2019, 11:50 PM   #14
xrk971 is online now xrk971  United States
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Stereo monoblocks - 3255 or irs2092
There are TPa3255 amp boards made by Dr Mord that also implement PFFB.
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Old 14th October 2019, 12:14 AM   #15
highcut28 is offline highcut28  Malaysia
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PSU is here (pick 48v 800w):
AliExpress


More info here:
TPA3255 Reference Design Class D Amp GB[/QUOTE]

Thanks for the link XRK
I checked out the PSU with the specifications you recommended.
Does it have a fan ?

I have a Meanwell 48V 600 watt PSU . It has a noisy fan, which I hve disconnected and use with the top cover removed . So far so good.

I would like to get another PSU. I am glad that you think they measure well and these are cheap!.
Hope they dont come with inbuilt fan.
Thanks
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Old 14th October 2019, 01:07 AM   #16
ThermalAlchemy is offline ThermalAlchemy  United States
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I too am interested in a pair of mono block class D to drive a par sub woofers to accompany my Nelson Pass amps. I was looking at these as a quick simple cheap fix until I find something that I want to build dedicated for subs only.

Google Shopping – Product not found

Wondom 1x3000w 3kw Class D Audio Amplifier Board -irs2092 Module Mono

Does anyone have any experience with these would they fill the purpose I’m looking for they say they take up to 92 V power.

I would either build my own power supply or purchase one depending on my time available for such a project.
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Old 14th October 2019, 10:53 AM   #17
grahamgraham is offline grahamgraham  United Kingdom
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Quote:
Originally Posted by xrk971 View Post
There are TPa3255 amp boards made by Dr Mord that also implement PFFB.
Thanks for the tip. I need a populated board, I'm afraid.

This is a little off topic but what is regarded as a reference design? Would the evaluation modules from TI represent that?

I simply need balanced ins and clean power, would these be appropriate?
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Old 15th October 2019, 03:11 AM   #18
Turbowatch2 is offline Turbowatch2  Germany
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A "reference design" should consider all problems and have the most decent solutionīs to the chipīs demands implemented. So if you build an amp module based on such a design, it should match the data sheetīs best data.

In contrast, the "Chinese art of amplifier design" is to leave away any expensive part possible and replace the rest with the cheapest junk that will still work, maybe, for a short period of time. (Also look for "I have no clue about electronicīs, but develop audio stuff for a living".)

xrk971 is designing an amp that he hopes will be even better than the "TI reference" and it seems this might work out well. The TI design is an universal board for trying the chip, not an end user product
3e audio tries the same, while Wondom wantīs people to believe that black PCBīs are automatically superior to any other color, while circuit design is irrelevant.
Should answer your question

Last edited by Turbowatch2; 15th October 2019 at 03:13 AM.
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Old 15th October 2019, 08:18 AM   #19
voltwide is offline voltwide  Ireland
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The TI EVM modul is a reference design. I do not like it too much with its bulky caps reverse mounted, but it is hard to beat its performance. It is a universal board to demonstrate all these different settings like 2xSE, 2BTL, 1 PBTL etc so there are many parts and option jumpers on board. For a specific application you can omit the redundant parts yielding a smarter design.
If you want to tweak the THD and noise figure numbers furthermore you may choose bigger inductors and a post-filter feedback - to achieve an improvement in the ballpark of 6~10dB at substantial efforts. I have been there and done that
All in all there is nothing wrong with using the EVM for your private HiFi imho.
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Last edited by voltwide; 15th October 2019 at 08:21 AM.
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