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Class D Switching Power Amplifiers and Power D/A conversion

TPA3255 - all about DIY, Discussion, Design etc.
TPA3255 - all about DIY, Discussion, Design etc.
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Old 2nd May 2019, 01:34 AM   #1211
KCN is offline KCN
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Join Date: Feb 2016
Quote:
Originally Posted by chermann View Post
Hi KCN

its recommended here to use 4700F low esr/esl about 20mohms..or lower
so change the 220 to 2x 2200F low esr in minimum.
can you measure the coils? what L they have..
chris

Thanks. There will be no space for 2x2200uf caps unless i leave the top cover open. is one 4700uf enough/Ok?
cannot measure coils.
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Old 2nd May 2019, 05:26 AM   #1212
chermann is offline chermann  Austria
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Join Date: Jan 2017
Location: Vienna
Quote:
Originally Posted by KCN View Post
Thanks. There will be no space for 2x2200uf caps unless i leave the top cover open. is one 4700uf enough/Ok?
cannot measure coils.

yes- the low esr/esl cap is at class D very important. you have to find a size which fits here and as big as possible but low esr/esl
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Old 5th May 2019, 08:09 PM   #1213
AnatoliyHill is offline AnatoliyHill
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Join Date: Feb 2019
Location: Ukraine
Hi, mates. My amp after worshop checking verdict: the tpa3255 is broken. All the i/o and power signals are ok, but no output. There are no visible damages on the chip. Any ideas? To replace chip would cost 10$ for chip and 10/20$ for work...seems like protection sometimes cant prevent overheat/overload . My guess it is due overheating.
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Old 6th May 2019, 12:22 AM   #1214
Turbowatch2 is offline Turbowatch2  Germany
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Join Date: Aug 2013
Location: Northern germany
Maybe you post a picture of your amp? This usual China stuff has a failure rate, as high as a Russian automobile... you might arrive or not.
But, unlike a Lada, in most cases repairing such an amp is, as you realized, not realistic, if replacement is the same cost.
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Old 6th May 2019, 05:16 AM   #1215
chermann is offline chermann  Austria
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Join Date: Jan 2017
Location: Vienna
Quote:
Originally Posted by AnatoliyHill View Post
Hi, mates. My amp after worshop checking verdict: the tpa3255 is broken. All the i/o and power signals are ok, but no output. There are no visible damages on the chip. Any ideas? To replace chip would cost 10$ for chip and 10/20$ for work...seems like protection sometimes cant prevent overheat/overload . My guess it is due overheating.
What did you? wrong polarity at the psu? died the amp during listening?

chris
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Old 6th May 2019, 03:34 PM   #1216
grubyhalo is offline grubyhalo  India
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Join Date: Aug 2008
Quote:
Originally Posted by cdsgames View Post
We are experimenting and trying to see if we can equal or best N400 using the 3255
Hi, any updates that you'd wish to share?
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Old 6th May 2019, 03:48 PM   #1217
AnatoliyHill is offline AnatoliyHill
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Join Date: Feb 2019
Location: Ukraine
Yes, died during listening
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Old 6th May 2019, 07:40 PM   #1218
chermann is offline chermann  Austria
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Join Date: Jan 2017
Location: Vienna
Quote:
Originally Posted by AnatoliyHill View Post
Yes, died during listening

i am sorry to read this...
i have 8x YJ TP3255 but no board died during listening.... if i had adead board it was my fault....e.g. destroyed traces, wrong polarity


chris
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Old 6th May 2019, 09:03 PM   #1219
voltwide is offline voltwide  Ireland
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Join Date: Jan 2010
Quote:
Originally Posted by chermann View Post
i am sorry to read this...
i have 8x YJ TP3255 but no board died during listening.... if i had adead board it was my fault....e.g. destroyed traces, wrong polarity


chris

same here. I am building with TPA3118 and TPA3255 for several years. Failures have been rare events, never spontaneous but due to some fault(s) from my side.
__________________
tuby or not tuby, that is here the question!
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Old 7th May 2019, 06:16 AM   #1220
AnatoliyHill is offline AnatoliyHill
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Join Date: Feb 2019
Location: Ukraine
Not my case, if there was fault it couldnt play. Damage happen during regular listening on rather high level biamp tpa3255 for mid/high+ tpa3116 double chip board loaded 8 hom canton sc-l.
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