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TPA3255: TPA 3255

Rasika Ranatunge
Prodigy 55 points
Part Number: TPA3255

I recently bought an amplifier from AliExpress  based on TPA 3255 chip. Board had a single power supply requirement of 48v dc. But my switch mode power supply had 51v dc out put. Amp worked without any problem the first day. Both clip and fault leds were lit during operation , which was normal as per the supplier. However the second day upon powering it up I noticed the fault led was off and the clip led was on as usual. But amp was not working. Upon contacting the supplier he maintained that due to higher voltage than 48 v would have destroyed the IC.  Is it possible ?  Since the max voltage for TPA 3255 is 53.5 v.dc. Does the ic have any protection against high voltage? How can I check the ic to ensure it’s faulty?

Your support  is very much appreciated,

Also where can I buy an replacement TPA 3255?

Thanks in advance

Rasika

  • 0
    TI__Mastermind 22320 points

    Hi Rasika,

    Based on your description, it is strange that 51V would damage this device. Is there any other components in the device that also see the PVDD voltage (51V line)? I would also check the external components around the TPA3255 to make sure that they are all rated for this higher voltage. I've run the TPA3255EVM at 51V numerous times and didn't encounter any issues like the one you described. This is leading me to think there is something else going on here. 

    You can get a replacement TPA3255 on the ti.com store as well as digikey.

    Best Regards,

    Robert Clifton

  • 0 in reply to Robert Clifton56
    Prodigy 55 points

    Hi Robert

    Thanks for your Prompt reply. Appreciate your expert advice. The board consists of a LM2575S -12 Voltage regulator. As per the data sheet maximum input voltage is 40V. Is that the reason supplier wanted to limit the voltage to 48V? I still did not check the out put voltage. Where can I get some information to check the TPA 3255? Thanks once again. I have uploaded some images for your reference.

    Rasika

  • 0 in reply to Rasika Ranatunge
    TI__Mastermind 22320 points

    Hi Rasika,

    That sounds like the limiting factor in this system! If it's possible to supply a seperate 12V supply and see if the part powers up properly then that would confirm that the LDO failed and not the part.

    Best Regards,

    Robert Clifton

  • 0 in reply to Rasika Ranatunge
    TI__Prodigy 300 points

    Hi,

    I'm not a TI expert on these parts, Robert is but I have used these modules before.  The layout is not bad but they used a lot of substandard parts.  Some of the main caps are lower voltage than they should be, the Vreg is not the correct part but TI does make a high voltage version.  I also replaced the op-amps and output filter components on mine.  These boards can be made to perform the way they should but most people would not want to mess will all the updates.  If someone just wants to try out the TPA3255 I would just buy the TI.com EVM but I had other reasons to go the route I did.    

  • 0 in reply to Jerry Gorman
    TI__Mastermind 22320 points

    Hi Jerry,

    Thank you for providing your insight in AliExpress! 

  • 0 in reply to Robert Clifton56
    Prodigy 55 points

    Hi Robert

    Checked the voltage regulator. It does work with a 12V output. Looks like TPA 3255is faulty. Any other external device that can trigger the Fault lamp? 
    Thanks

    Rasika

  • 0 in reply to Jerry Gorman
    Prodigy 55 points

    Hi Jerry 

    Thanks for your advice. Do you y any chance have the circuit diagram of this board? Can please give me some advice how to upgrade this board to something usable? What is the power supply you used with your board? Is it 48V or higher? Your advice is very much appreciated. Do you think the TPA 3255 they use is genuine?

    Rasika

  • 0 in reply to Rasika Ranatunge
    TI__Mastermind 22320 points

    Hi Rasika,

    Because you're using an AliExpress board it makes determining whether it's a board issue or a part issue difficult. As you mentioned, they might have not even have a genuine TPA3255 on it!

    I recommend doing either:

    - order another part from a distributor or TI.com and replace the part on the board.

    - Order our official TPA3255EVM 

    The TPA3255EVM allows more flexibility in different configurations than the board you are using and I know will work. You can still try to use the AliExpress board but might require additional debug. 

    Best Regards,

    Robert Clifton

  • 0 in reply to Robert Clifton56
    Prodigy 55 points

    Hi Robert

    Your suggestion is well received. I will try and Order TPA 3255EVM soon. Out of curiosity, How can one Identify a Fake TPA 3255? Its available on aliexpress for $5. Is it possible? When its sold at $10 By TI and its authorized dealers?

    Will I be able to use My power supply unit which gives around 53V max with TPA 3255EVM? IF not what do you suggest?

    Thanks once again for your support!!

    Rasika

  • 0 in reply to Rasika Ranatunge
    TI__Mastermind 22320 points

    Hi Rasika,

    To be honest I'm not entirely sure how one can identify a fake TPA3255. If it's $5 that would be very suspicious. Also we can't guarantee it's a genuine TPA3255 if it's ordered from a non authorized TI distributor. I say stick with the authorized TI distributors to be safe! 

    A power supply that outputs 53V max should work as long as the power supply is clean and doesn't have any noise that creates high voltage spikes above the voltage it's outputting. 

    It's always a pleasure helping fellow engineers! 

    Regards,

    Robert Clifton