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Class D Switching Power Amplifiers and Power D/A conversion

TPA3255EVM to complete amp (advise needed)
TPA3255EVM to complete amp (advise needed)
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Old 22nd February 2019, 04:58 AM   #91
chermann is offline chermann  Austria
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Join Date: Jan 2017
Location: Vienna
Quote:
Originally Posted by gigigirl View Post
Hi, I have a TPA3255-EVM board coming, so I thought I would check through this thread. A little shocked to find out about this Reset switch, not seen it mentioned anywhere else. Does that mean I need to reset it everytime I turn the amp on. Cheers
Hi
yes of course..i have the tpa3251EVM board and this is similar. i
guid line EVM says:
Set S1 to the RESET position.



f you want to avoid a on/off plop you have to set the switch on...this set the reset pin to GND for the moment the power supply is running up.


to avoid this you have to deal with an extra circuit -the pic shows the valuse of th chines YJTPA3255 board...so recheck it


at this post i got some advices from DOC to solve my issue: (thanks doc )
What is wrong with TPA3255?


chris
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Old 23rd February 2019, 04:32 AM   #92
gigigirl is offline gigigirl
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Join Date: Oct 2016
Default As the 1st post said Help Needed

Thanks chermann, That will be a pain, but it it sounds as good as it's reputation, I can live with it.
However I cannot get this board to work, I am trying to have in working in simple 2 channel configuration. I have over the years set many different boards up, even a TI 3116, simple normally, but this one has me beat.
Can anyone advise how to set it up for simple 2 channel. Using a 42 watt Meanwell 5 amp power supply for it.

Cheers

P.S, please don't ask me to read the TI.pdf manual as I have read it & cannot understand it.
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Old 23rd February 2019, 08:34 AM   #93
chermann is offline chermann  Austria
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Join Date: Jan 2017
Location: Vienna
Hi


i do not want to badger you....check all voltages -step by step

supply- regulator-opamps-tpachip..


give us more light to help you...pics..etc..


chris
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Old 23rd February 2019, 01:09 PM   #94
Think is offline Think  Netherlands
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Join Date: Nov 2017
Location: Den Haag, Holland
TPA3255EVM to complete amp (advise needed)
@gigi: in post 86 TPA3255EVM to complete amp (advise needed) I posted a link for a finished $1 module you can use to hold the reset switch for you. And linuxfan added that you can connect it to the big black pin header (J28) instead of soldering it to the bord in post 88 TPA3255EVM to complete amp (advise needed)

Check you power supply, measure output voltage and/or try an other supply 18V should be enough.

Your bord came in BTL 2 channel mode. You can check the settings with the EVM user guide: http://www.ti.com/lit/ug/slou441/slou441.pdf page 6 if they are correct.

These few steps should give you sound.
-Connect 2 speakers to the big terminals.
-Connect a source (in AB and in CD)
-Connect power (and switch on) and the 2 green leds (3.3V 12V) should light up.
-Switch the reset switch to 'normal'
-Turn up the volume from the source.
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Old 23rd February 2019, 05:26 PM   #95
chermann is offline chermann  Austria
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Join Date: Jan 2017
Location: Vienna
Quote:
Originally Posted by Think View Post
@gigi: in post 86 TPA3255EVM to complete amp (advise needed) I posted a link for a finished $1 module you can use to hold the reset switch for you. And linuxfan added that you can connect it to the big black pin header (J28) instead of soldering it to the bord in post 88 TPA3255EVM to complete amp (advise needed)

Check you power supply, measure output voltage and/or try an other supply 18V should be enough.

Your bord came in BTL 2 channel mode. You can check the settings with the EVM user guide: http://www.ti.com/lit/ug/slou441/slou441.pdf page 6 if they are correct.

These few steps should give you sound.
-Connect 2 speakers to the big terminals.
-Connect a source (in AB and in CD)
-Connect power (and switch on) and the 2 green leds (3.3V 12V) should light up.
-Switch the reset switch to 'normal'
-Turn up the volume from the source.
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Old 27th February 2019, 03:42 AM   #96
gigigirl is offline gigigirl
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Join Date: Oct 2016
Hi Guy's thanks for all your help, amp is up & running now and I am please that set up (no case) It is supper, super quiet. A lot quieter than my previous Shure 200 watt amp, that always me rence interfenoise problems. However sound quality wise I heard more difference changing my phono amp op-amps to Bursons V6's that I do between these amps. Perhaps the 3255 has a little cleaner more impactful lower lower mid range. Still very happy with the result.

Cheers
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Old 17th April 2019, 09:58 AM   #97
Titu is offline Titu  France
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Quote:
Originally Posted by linuxfan View Post
The RESET switch connection is accessible at pin 10 of the female header J28, so all you should need to do is connect this pin to one side of your external switch, and connect the other side of your switch to pin 22 (GND).

I use a double swicht 2NO2NC for power on/off the PSU and switching RESET at the same time.
It works fine.
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Old 18th April 2019, 08:37 AM   #98
dekron is offline dekron  France
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Join Date: Aug 2018
Hi,


Ive bought 3 tpa3255 modules (from 3e audio) in order to supply two speakers through an active filtering process (85db efficiency at 2.83v, each made of wavecor tw030wa06 4ohm and 2*wf182bd10 8 ohm).
It s design to be the main home sound system, this may be overkill since the efficiency below some watts isn't that good, anyway ...

1) I have yet to choose the right PSU to match these boards. I guess I should pick one within the voltage range explained previously (48V for example), but what about the current supply amount ?
Despite having three board to supply instead of one, each one of them will drive only one woofer or tweeter, instead of the full speaker in a passive design, then I just don't know if in the active configuration the three board will require half or a third of the current that would otherwise be required in a passive setup ? Or should I buy a much larger PSU ?

(I would rather avoid buying three lone PSU...)


2) May some users of the TPA3255 tell me how they set up the soft start / soft stop (for the disturbing sound) and DC protections (to protect the loudspeakers coils) ? And why (price ? easy set up ? easy to use ? efficiency ? class D compability ?)


3) I didn't really get what is the issue with the RESET function you are talking about ? Should we have to activate it at each startup ?? A physical jumper somewhere on the board isn't enough ?


thanks

Last edited by dekron; 18th April 2019 at 08:49 AM.
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Old 20th April 2019, 12:56 AM   #99
Rick PA Stadel is offline Rick PA Stadel  United States
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Join Date: Apr 2017
Location: greater Kansas City, USA
I'm confused -- why do you need 6 channels of power amp for bi-amped stereo?

Also, IMHO, exposing 60W tweeters to an amp ch w/this much power is, at the very least wasteful -- at most, unlikely to survive for very long. Seems like a -3251 or one of the -3110 series would be PLENTY for the tweets.

Cheers,
Rick
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Old 21st April 2019, 03:33 PM   #100
dekron is offline dekron  France
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Join Date: Aug 2018
the amp may be used for an other setup later on like a passive 5.1 home theater. I assumed 3 identical amp would be easyer to match, even if the power requierd by the tweeters wouldn't be that huge.


Anyway I do need 6 channel to supply 6 differents loudspeakers in an active filtering design..


So my previous questions are still ongoing, thx
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