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TPA3111D1-Q1: Available output power

Ryuuichi machida
Guru 11655 points
Part Number: TPA3111D1-Q1
Other Parts Discussed in Thread: TPA3112D1, TPA3111D1

Hi,

I would like you to confirm about below.

* According to datasheet, there is following spec.


 
  However, on the other hand, it seems that this device have capability to realize 20 W output power from following figure.


  
 
Is it possible to use over 10W output power in this device (At least, we can see that we can use 20W output power from datasheet) ?

Best Regards,

  • 0
    TI__Mastermind 24835 points
    Hi Machida-san,
    10W is the typical continuous output power for TPA3111D1-Q1, while the figure which shows THD vs. Output in the datasheet is for the instantaneous output power. Continuous output power mainly depends on the thermal design in system. As you described above, the output signal is still far away from clipping when outputing 20W with 8ohm/24V. So the device can output 20W in this case if the system thermal design is good enough.
    Bet regards,
    Shawn Zheng
  • 0 in reply to Shawn Zheng
    Guru 11655 points

    Hi Zheng-san,

    Thank you for your reply.

    >Continuous output power mainly depends on the thermal design in system.

    This comment does not sit well with me.
    Because, according to both TPA3111D1-Q1 and TPA3112-Q1 datasheet, thermal information and package is same as shown below.

    So user can concider same way for thermal design. Therefore I can not explain about difference of output power from viewpoint of this..

    I guess that the difference b/w these two devices are ATE.  But if my understanding is incorrect, could you please correct me ?

    BR,

  • 0 in reply to Ryuuichi machida
    TI__Mastermind 24835 points
    Hi Machida-san,
    Sorry for the confusion. For different devices, thermal peformance contributes much to the final continuous output power ability. e.g, A device has lower RDson than B device, then the heat dissipation is lower on A device under the the same condition. e.g., C device is in pad-up package and D is in pad-down package and the other condition is the same, then C device has stronger output power ability than D, because C can use a heatsink.
    While for TPA3111D1 and TPA3112D1, they are very similar device(they are spin devices). You are right that the thermal design is almost the same between them, and the only difference between them is ATE trim.
    Best regards,
    Shawn Zheng