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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 25th March 2019, 08:22 AM   #1071
cdsgames is offline cdsgames  Canada
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Join Date: Jun 2015
Quote:
Originally Posted by doctormord View Post
10dB lower than 0.002%? Also for the 6.67kHz, I'd be interested how you did achieve 0.003%...

Doctormord , those are just preliminary findings . We modified the PFFB using opamps , inductors were changed to correct wire and of course we used every trick we learned in our volt ( our tpa3118 beats EVM by 12-18db)



The 6.67 is nothing like I see in the pffb datasheet , it looks more like the 1Khz


Of course , layout is important , chemistry of caps etc...pay a LOT of attention to PSU (clean)



We are trying to beat the Ncore (tested at 0.0005THD+N)


Still lots of work , but I think that this IC will equal or beat it.
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Old 25th March 2019, 12:14 PM   #1072
hansueli is offline hansueli  Switzerland
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Join Date: Oct 2017
I just found a better version of the AIYIMA TPA3255.

Click the image to open in full size.


AIYIMA TPA3255 Bluetooth 5.0 Sound Amplifier Audio AMP 325W*2 Stereo Class D Amplificador Power Amplifiers DAC PCM5102 Decoder


It has PCM5102 and QCC3003 and look like to have better cap.
But no changed supply rail caps. But must be better for modding. I hope

Last edited by hansueli; 25th March 2019 at 12:25 PM.
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Old 25th March 2019, 12:37 PM   #1073
chermann is offline chermann  Austria
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Join Date: Jan 2017
Location: Vienna
Quote:
Originally Posted by hansueli View Post
I just found a better version of the AIYIMA TPA3255.

Click the image to open in full size.


AIYIMA TPA3255 Bluetooth 5.0 Sound Amplifier Audio AMP 325W*2 Stereo Class D Amplificador Power Amplifiers DAC PCM5102 Decoder


It has PCM5102 and QCC3003 and look like to have better cap.
But no changed supply rail caps. But must be better for modding. I hope


if you buy and start modding it would be nice to have a seperat thread.
@BT i read that the Apxt module should be the best. if i rememeber right at the TPa3116 module "doc" give some advices to solve the hiss problems there...

chris
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Old 25th March 2019, 12:45 PM   #1074
hansueli is offline hansueli  Switzerland
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I am looking first to build my Iraudamp7 with 500W LLC power supply.


But why not a new project after with this TPA3255 :-D
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Old 25th March 2019, 01:04 PM   #1075
AnatoliyHill is offline AnatoliyHill
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Location: Ukraine
Quote:
Originally Posted by chermann View Post
[/B]

if you buy and start modding it would be nice to have a seperat thread.
@BT i read that the Apxt module should be the best. if i rememeber right at the TPa3116 module "doc" give some advices to solve the hiss problems there...

chris
Looks like mine but with BT5 version, should be better but still less bass
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Old 25th March 2019, 01:09 PM   #1076
AnatoliyHill is offline AnatoliyHill
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Join Date: Feb 2019
Location: Ukraine
It is not easy to get low Esr caps 63v/1800 in the middle of nowhere I am living now. There are some caps available in local shops but seller s have no idea about low esr/ impendance of capacitor s they sell just voltage and capacity with no data about esr. Thus no progress for now. Booking via internet and waiting think no worth efforts. Will try another board described here with elna big caps.
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Old 25th March 2019, 01:33 PM   #1077
chermann is offline chermann  Austria
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Location: Vienna
Quote:
Originally Posted by AnatoliyHill View Post
It is not easy to get low Esr caps 63v/1800 in the middle of nowhere I am living now. There are some caps available in local shops but seller s have no idea about low esr/ impendance of capacitor s they sell just voltage and capacity with no data about esr. Thus no progress for now. Booking via internet and waiting think no worth efforts. Will try another board described here with elna big caps.
which one do you get?...give us something we can look -
the caps should be valid for SMPS...maybe this helps your shop guy....

the voltage rating is important = 63V...the rest we can do with paralleling the caps

chris
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Old 26th March 2019, 01:57 PM   #1078
doctormord is offline doctormord  Germany
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Quote:
Originally Posted by hansueli View Post
I just found a better version of the AIYIMA TPA3255.

Click the image to open in full size.


AIYIMA TPA3255 Bluetooth 5.0 Sound Amplifier Audio AMP 325W*2 Stereo Class D Amplificador Power Amplifiers DAC PCM5102 Decoder


It has PCM5102 and QCC3003 and look like to have better cap.
But no changed supply rail caps. But must be better for modding. I hope

According to the QC300X datasheet, the QC3003 does not implement APT-X, so only SBC/AAC/MP3 link is available.


Link:
https://www.qualcomm.com/media/docum...duct-brief.pdf


Btw. QC3003 is "same" as CSRA63210.
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Old 27th March 2019, 11:46 AM   #1079
AnatoliyHill is offline AnatoliyHill
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Join Date: Feb 2019
Location: Ukraine
Hi, everyone. There was a consider here that my super psu 1200w can limit the current and it might be the reason of limiting my tpa3255. Actually iwas very sure that psu with 50v/1200w should deliver big reserve in power supply . To define it I connected tpa3255 to HP notebook adapter 19,8V/90 W and found some improvement in sound increase. The tpa3255 couldnt start both channels from the first attempt, i connected one wire channel then second. Guess some other kind of protection prevented it to start with low voltage. Anyway it started and wow it sounded very nice endeed even with 19,8 V. So, now need to eliminate my psu current limiter. Think just add capacitors between psu and tpa3255 , think 10000 mkF would be enough to see the progress. What do you think, mates?
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Old 27th March 2019, 07:04 PM   #1080
chermann is offline chermann  Austria
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Location: Vienna
hi anatoliy


fine that you find the reason of limiting the current.


but no the laptop bricks are build to be cheap and deliver "constant" current into the load, more or less its a slow regulation circuit. so an additionally cap doesn't help here in the final solution.


the class D amp must have a good, very good regulated smps with the correct "designed" power what you need and calculate. therefore a big fat cap bank, e.g. 1000000F is not needed, because the smps regulation circuit is not able to regulate this "request" correctly -- voltage overshoot!!!


a very good explanation is here:
Favorite Threads and Posts in "Class D" Forum


i personal use original mean well 150W-24 (set to 28V) - about 20 euros or a mean well 350W-36V 50 euros for my needs

BTW...its not 10000mF...its 10000F...a big difference!


chris
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