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Class D Switching Power Amplifiers and Power D/A conversion

Does this TPA3255 look right?
Does this TPA3255 look right?
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Old 16th April 2019, 02:34 AM   #1
bonjonno is offline bonjonno  United States
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Default Does this TPA3255 look right?

Just noticed this on ebay for a bit over $60USD. Described as TPA3255 Integrated Bluetooth5.0 Stereo Digital Class D. I've never seen any like it w/ built in Toroid, and the board doesn't seem like the right kind of amp; no inductors?
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Old 16th April 2019, 04:51 AM   #2
chermann is offline chermann  Austria
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yes..its looks really strange...no inductors ...less space for chip and small heatsink, no opamps


fake!

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Old 16th April 2019, 07:43 AM   #3
abraxalito is offline abraxalito  United Kingdom
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Look at the top - there's a copper-coloured bar as clamp/heat spreader. Then just under that there are two 11-pin packages mounted beneath whose pins can be seen poking through on the top side. My money's on this being a bog-standard LM3886 stereo amp.
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Old 16th April 2019, 07:58 AM   #4
chermann is offline chermann  Austria
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Quote:
Originally Posted by abraxalito View Post
Look at the top - there's a copper-coloured bar as clamp/heat spreader. Then just under that there are two 11-pin packages mounted beneath whose pins can be seen poking through on the top side. My money's on this being a bog-standard LM3886 stereo amp.
jop...you are right...
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Old 16th April 2019, 03:02 PM   #5
bonjonno is offline bonjonno  United States
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Thanks abraxalito for the explanation. A few places have this on offer, but all their descriptions are exactly the same. Here's one ebay
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Old 16th April 2019, 03:12 PM   #6
wcwc is offline wcwc  United States
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Interesting that they have DAC in the title. I guess that it is for the bluetooth connection. Looks like a LM3886 chip with no heat sink. I doubt they will get anywhere close to the wattage they are claiming in their text write up.
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Old 16th April 2019, 06:42 PM   #7
Khron is offline Khron  Finland
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I can see TWO LM3886 footprints in there. Looks like they're using the bottom case as (somewhat of) a heatsink.

To quote AvE, that's "gonna get hotter than a $2 pistol"...
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Old 17th April 2019, 04:28 AM   #8
xrk971 is online now xrk971  United States
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Does this TPA3255 look right?
Maybe this one is more appropriately photographed. Complete with inductors and BT module.

https://www.ebay.com/p/Tpa3255-2-1-H...2305877&chn=ps

Click the image to open in full size.
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Old 17th April 2019, 06:28 AM   #9
gigigirl is offline gigigirl
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Well if nothing else the toroidal & case are well worth $61, through the board away!!!!
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