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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 Today, 01:20 PM   #2351
potstip is offline potstip  Turkey
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Join Date: Oct 2013
Quote:
Originally Posted by bucks bunny View Post
Meanwhile I had some ideas for improvements that ended in additional iterations of the TPA325x-PBTL pcb-design. Actually that is the news:
+12V Sync-buck-regulator extended to “flybuck” providing +-12V symm supply for op-amps.
10pin IDC-connector added to connect via ribbon cable a new control pcb providing 4 operating status LEDs and another 10pin port for diagnostic measurments.
Replacing output inductors by latest Würth HIDE-series with small footprint.
PCB dimensions shrinked from 100x75mm down to 100x62mm.
IN PBTL mode according to datasheet support 2-4 ohm. what about 8 ohm?
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Old Today, 01:21 PM   #2352
potstip is offline potstip  Turkey
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Join Date: Oct 2013
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Originally Posted by cdsgames View Post
I was able to improve EVM of 6.67Khz/10W/4R (non PFFB) from 0.012% to 0.005%


With PFFB (while not tested) I would expect it to be 0.0025%, Our goal is to make it around 0.001 % at a max



What I did , is tryed over 20 inductors and ended up making a custom one. As you can see inductor influences distortion by quite a good amount .
Can you share custom inductor details. I want to try on my board.
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