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Class D Switching Power Amplifiers and Power D/A conversion

TPA3255 - all about DIY, Discussion, Design etc.
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Old 22nd February 2019, 11:34 AM   #1011
doctormord is offline doctormord  Germany
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Quote:
Originally Posted by AnatoliyHill View Post
Wow, Dear Think mentioned original topology contain 2#4700mkF which almost double more I have in my box. Is this a main reason for lack of bass I am having? Furthermore I have only one capacitor enstead of two, think it worth to take of sink enable mates see the topology for further decision.
As written already - no.
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Old 22nd February 2019, 12:44 PM   #1012
Think is offline Think  Netherlands
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Thx again people.

@chermann; thx for the tips I won't use the power supply or booster again. The power adapter seems to be fine though, the booster not.

@ jimk04; csmt is short for Customer Support Management Team?

@ doctormord; should I make a topic at TI's forum or email them?
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Old 22nd February 2019, 02:07 PM   #1013
doctormord is offline doctormord  Germany
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I'd mail them first, it's the "high power audio" department.

You may consider dropping "frammis" a private notification here in the forum, he's "somewhat" related to these chips.

Last edited by doctormord; 22nd February 2019 at 02:09 PM.
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Old 22nd February 2019, 03:02 PM   #1014
zeroFILL is offline zeroFILL
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After a long time following this thread, I decided to order a TPA3255 board, and it just came yesterday Very nice!
Thank you all for sharing your knowledge and passion!

BTW, I'm going to add a potentiometer to control volume, so which value to chose? Is a 50k Ohm one will work? Thanks!
Attached Images
File Type: jpg 20190221_210220.jpg (766.6 KB, 347 views)
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Old 22nd February 2019, 03:02 PM   #1015
Think is offline Think  Netherlands
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Arrow Pic's of the horror scene came out better then expected.

It looks to me that the PVDD pins have arced to the heatsink (there is a little pitting) and not to 1 of ground pins or caps nearby.

//edit: thx again doc, I will do that.
and bigger pics can be found here

https://i.postimg.cc/HxL87mZD/1-DSCF5569.jpg
1 DSCF5577 — Postimage.org
1 DSCF5584 — Postimage.org
1 DSCF5594 — Postimage.org
1 DSCF5602 — Postimage.org
( did not work out as I like, sorry)

Click the image to open in full size. Click the image to open in full size. Click the image to open in full size. Click the image to open in full size. Click the image to open in full size.

Last edited by Think; 22nd February 2019 at 03:14 PM. Reason: postings in the mean time.
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Old 22nd February 2019, 05:23 PM   #1016
jimk04 is offline jimk04  United Kingdom
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@ jimk04; csmt is short for Customer Support Management Team?

No sorry that was my phone auto correcting 'cant' to 'csmt ' for some reason!
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Old 22nd February 2019, 05:43 PM   #1017
Think is offline Think  Netherlands
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Thx, that makes sense.
Offtopic; probably the same season I could not get the picture thing right even though I used to make websites in the early days.... it should be simpler now... somehow or is it only me who got simpler as time goes by? :?
Tinypic was down, so I thought let's try something else.
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Old 26th February 2019, 05:34 PM   #1018
doctormord is offline doctormord  Germany
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So, in the end they found together, TPA3255 2.1 100x100mm system in direct contact with the 1200W 4-phase LTC3784 boost-converter board, making it possible to go the distance with even only having 10V at the input to put out 600Wrms. As this asks for 1200W power into the amp and an realistic efficiency of 92% from the boost converter, this setup is asking for 130A at the 10V input. (Things get much easier when using a 36V supply) For the AFE module and bulk caps there is a mounting holder within half of the height to make good support for stability while driving with the bike. The whole thing measures 110x110x70mm, i'd call this a power-brick.

TPA3255 - all about DIY, Discussion, Design etc.-img_20190226_134652-jpg

TPA3255 - all about DIY, Discussion, Design etc.-img_20190226_134754-jpg

TPA3255 - all about DIY, Discussion, Design etc.-img_20190226_134907-jpg

TPA3255 - all about DIY, Discussion, Design etc.-img_20190226_134943-jpg

Bike? The bike with the actual setup, TPA3255 + 3x12V SLA system...

Youtube: YouTube
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File Type: jpg IMG_20190226_134652.jpg (147.0 KB, 768 views)
File Type: jpg IMG_20190226_134754.jpg (186.1 KB, 765 views)
File Type: jpg IMG_20190226_134907.jpg (143.0 KB, 758 views)
File Type: jpg IMG_20190226_134943.jpg (140.5 KB, 764 views)

Last edited by doctormord; 26th February 2019 at 05:40 PM.
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Old 27th February 2019, 08:31 PM   #1019
Think is offline Think  Netherlands
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Very nice!

1) Did you do some measurement of maximum continues power draw?
2) Is passive cooling OK with 36V?
3) How many Ah are the SLA's and do you have an indication of run time?

To power a 600W AB car amp at high volume, a laptop and a tiny usb powered mixer for 8 hours I needed to bring 2x 12V 105Ah deep cycle batteries (2x20+kg) .... and could warm my hands on the amp. As I could only draw them to 50%, that is only a bit more then 1kwh.

I intend to use a 36V 8.4AH (0,3kwh and 3kg) ebike battery which was given to me as defective but is fine with only a new fuse on the charging port.

I estimate it will run more then 8 hours.



The Hooverboard /Oxboard (2 wheel kids balance toy) batteries might be interesting to use. They are 2p10s 18650's, 36V 4.4AH often Samsung cells and sell for €40. I know an address to pick up defective packs for €5 of which most prob. need a new bms as they are tortured (rigorously tested ) by the 2x 250w motors going back and forth.
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Old 28th February 2019, 06:09 AM   #1020
doctormord is offline doctormord  Germany
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Short answer first:

1: What measurements are you looking for, amp or boost? i have plenty of documents/measurements done

2: yes, even in an closed enclosure

3: I use 3x5Ah deep cycle cells, so about 60Wh which will do about 5-6hours at early full power. (The speakers are better than 96dB. With the all new 36V 10s4p 11.8Ah pack which is about 420Wh, the amp theoretically will run 42 hours.. but i want to use them in a 30-80% manner, so charging only to 4.00V and discharge only to 3.3V per cell at normal.

The 10s2p packs might struggle on peak power performance, if not the cells, then the BMS. I have one of these packs here, with fake Samsung cells and rusty BMS, sold as brand new...
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