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TPA2008D2: TPA2008D2 OCP

MattLin
Intellectual 1050 points
Part Number: TPA2008D2

Hi Team my customer is having an issue as described below:

With 3.6Ohms speakers connected to each output of the TPA2008D2 part (one per channel) and the volume set to 60% and above they see that the speakers make a quick sound but then rapidly turn off. Once this happens, sounds cannot be played through the monitors/speakers until power is cycled on the monitors.

Questions:

  1. They have switched to connecting both speakers in series and driving them with one output of the TPA2008D2. Do you see any issue with this?  This may have fixed our problem, but they are getting some reports of intermittent issues that might be related.
  2. It looks like we may be hitting the short circuit protection circuitry of the TPA2008D2.
    1. What is the current level to trip this short circuit protection?
    2. How long of a duration short circuit will trigger the protection?
    3. Does is trip instantaneously or does the over-current need to persist for some amount of time?  
  • 0
    TI__Guru* 99095 points

    Hi Matt,

    Since you have to power cycle this is indeed short-circuit protection, which in turn is current based.
    Unfortunately we don't have a specific number or details on how the protection works, but it is most likely similar to other TPA20xx devices, which is 2.3A~4A depending on VDD, and it also most likely act instantaneously.

    Connecting both speakers in series would mean divide the current (and thus power) flowing through each of them, as well as increasing load impedance.
    I don't see any problem doing this for this kind of amplifier.
    perhaps the 3.6-ohm speaker is going lower in impedance depending on signal being played, thus causing the device to trigger its protection.

    Please let me know if there are any further questions.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators