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Class D Switching Power Amplifiers and Power D/A conversion

What is wrong with TPA3255?
What is wrong with TPA3255?
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Old 9th July 2017, 09:16 AM   #1
diytoon is offline diytoon  Belgium
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Default What is wrong with TPA3255?

Hi,

I have tried a bunch of TPA3116 amps...they all sound OK, some sound very well...

I am ready for the next step in class D amplifiers, thats how I found TPA3255...specs look very promising.

I could not find any DIY boards so I ordered TAS5630B instead...not my cup of tea...to noisy. (I hear a white noise in my listening chair)...

I was wondering why I could not find any DIY boards based on TPA3255...

Any hints?

kind regards,

Tony
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Old 9th July 2017, 09:35 AM   #2
voltwide is offline voltwide  Ireland
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the chinese manufacturers normally copy and paste the EVM-board and do little modifications later on. Looking at the EVM-TPA3255 this does not look very sexy with its backside bulk caps. I think it needs a re-design to fit into the market - too much, and too risky development for low-cost producers. For a nicer design you may have a look at diyAudio server HTTPS page

Last edited by voltwide; 9th July 2017 at 09:39 AM.
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Old 9th July 2017, 11:10 AM   #3
diytoon is offline diytoon  Belgium
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Quote:
Originally Posted by voltwide View Post
the chinese manufacturers normally copy and paste the EVM-board and do little modifications later on. Looking at the EVM-TPA3255 this does not look very sexy with its backside bulk caps. I think it needs a re-design to fit into the market - too much, and too risky development for low-cost producers. For a nicer design you may have a look at diyAudio server HTTPS page
Link does not work...
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Old 9th July 2017, 12:21 PM   #4
irribeo is offline irribeo  Netherlands
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TPA3255 260W 2CH Class D Audio Amplifier | eBay

No choice on ebay but you can buy one, maybe other here on diyaudio or aliexpress.

edit other link for post above:
Class-D ? #360customs

Last edited by irribeo; 9th July 2017 at 12:28 PM.
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Old 9th July 2017, 01:34 PM   #5
diytoon is offline diytoon  Belgium
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Quote:
Originally Posted by irribeo View Post
TPA3255 260W 2CH Class D Audio Amplifier | eBay

No choice on ebay but you can buy one, maybe other here on diyaudio or aliexpress.

edit other link for post above:
Class-D ? #360customs
In the process of ordering one from 3eaudio...no shipping to Belgium, but received email how to get one...
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Old 10th July 2017, 01:55 PM   #6
doctormord is offline doctormord  Germany
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I like their 3250 design and the use of JRC4580:

TPA3250D2 50W 2CH Class D Audio Amplifier

$99 for a 3255 is a bargain.

Last edited by doctormord; 10th July 2017 at 01:58 PM.
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Old 10th July 2017, 03:28 PM   #7
diytoon is offline diytoon  Belgium
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Payed...will be shipped this week...114 dollar including shipping...
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Old 12th July 2017, 04:50 AM   #8
SanjeevM is offline SanjeevM
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Apart from output power, is there a sonic difference between 3251 & 3255?

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Old 12th July 2017, 01:48 PM   #9
doctormord is offline doctormord  Germany
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They differ in Powerstage-Fet-size, so Rds_on differs. Beside that, they're the same.

I compared THD of both from the datasheet a while ago here:

TPA3251 vs. TPA3255 THD according to data sheet - #360customs

So this is EVM performance.
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Old 12th July 2017, 03:31 PM   #10
SanjeevM is offline SanjeevM
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Thanks. What that means is that if you have 8 ohm speakers, youre better off with 3255, more power and better thd.

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