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TPA3136D2: Asking for the TPA3136 THD performance

SHH
Mastermind 32126 points
Part Number: TPA3136D2

Hi Team,

1. What is the THD data under 4ohm/PVDD5V conditions?

2. If the PVDD is varied from 6V to 12V, will TPA3136 keep the same output power to 4ohm?

Thanks,

SHH

  • 0
    TI__Mastermind 25895 points
    Hi SHH,

    Shawn is looking into this for you. Please check back for a post from him in a bit. To answer part of your question, TPA3136D2 is a closed loop device so output voltage will be independent of PVDD level.

    Regards,

    Alex
  • 0 in reply to Alex Bhandari-Young
    TI__Mastermind 32126 points
    Hi Alex,
    Thansk for help. I will wait for Shawn's reply.

    Cusotmer would like to drive four speaker throung one TPA3136.
    left side has two parallel speaker 4ohm(2W) and 8ohm1W.
    right side has two parallel speaker 4ohm(2W) and 8ohm(1W).

    The the driving load at left and right side is 2.6ohm. According to the spec, it cannot support.
    However, can I confirm with you if customer uses this case that TPA3136 is able to drive 2.6ohm load or not?


    Thansk,
    SHH
  • 0 in reply to SHH
    TI__Mastermind 32126 points

    Hi Alex,

    Here is the idea from custom for the four speaker. Any solution if TPA3136 cannot  support the Rload 2.6ohm?

    Thanks,

    SHH

  • 0 in reply to SHH
    TI__Mastermind 24835 points

    Hi SHH,

    My answer is as below:

    1. What is the THD data under 4ohm/PVDD5V conditions? - please refer to the THD performance with PVCC=5V/Load=4Ohm/1kHz input.

    2. If the PVDD is varied from 6V to 12V, will TPA3136 keep the same output power to 4ohm? - As Alex explained, the output should be the same as soon as there is no clipping on the output with 6V. Please note that the efficiency is higher with lower power supply level for the same output power.

    3. Here is the idea from custom for the four speaker. Any solution if TPA3136 cannot  support the Rload 2.6ohm? - The output power is 3W(2W+1W) on 2.67Ohm(8Ohm//4Ohm) load on each channel. So the maximum output current is 1.5A. The over-current threshold on TPA3136D2 is around 2.5A with 5V power supply. The maximum current is still far away from the OC THR, then it's a safe application.

    Best regards,

    Shawn Zheng  

  • 0 in reply to Shawn Zheng
    TI__Mastermind 32126 points

    Hi Shawn,

    Thanks for help.

    for quesitons 1, what is the THD under 5V/4ohm/2Watt?

    for questions 3, can you confirm ther is no side effect if customer use 4ohm and 8ohm parrallel?

    from the datasheet, there is the Rload mix support value. 3.2ohm under BTL and PVDD <12V.

    from previous TAS5729 experience, there will be some waveform discuntinuty if Rload is smaller than the min load.

    Thansk,

    SHH

  • 0 in reply to SHH
    TI__Mastermind 24835 points

    Hi SHH,

    The THD performance for 2W is very similar to 1W.

    About 'side effect', could you please help to explain more? Some custoemers have ever used 8Ohm//4Ohm load previously, and we didn't find problem.

    Yes, in datasheet, the minimal load is 3.2Ohm with PVCC<12V. Becasue we need to make sure there is no OC FAULT for a high output power. But in your application, the output power is very low(3W). As the above calculation, the maximum output current is still far away from the OC THR.  

    For more questions or issues, you can also send me email.

    Thanks and best regards,

    Shawn Zheng

  • 0 in reply to Shawn Zheng
    TI__Mastermind 32126 points
    Hi Shawn,
    Thanks for explain. It is clear for question 3. Previous TAS5729 trrigger the OC under the higher power and lower Rload case. As you said, it is different than this 3W case.

    For customer case, what is the THD for parrllel 4ohm(2W) and 8ohm(1W) ?
    For C90/C93/C84/C87, is that ok to put on the twitter speaker trace directly?


    Thanks,
    SHH
  • 0 in reply to SHH
    TI__Mastermind 24835 points
    Hi SHH,
    Please see my answers below.
    For customer case, what is the THD for parrllel 4ohm(2W) and 8ohm(1W) ? - THD is around 0.1% with PVCC=5V and Load=2.7Ohm.
    For C90/C93/C84/C87, is that ok to put on the twitter speaker trace directly? - Tweeter speakers only response the high frequency components. The serial capacitor and resistor on tweeter speakers form a HPF, and the crossover frequency is 0.159/(C*R).
    Best regards,
    Shawn Zheng