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Reliability Test of TAS5727 PBTL mode

Jeffrey
Expert 1920 points
Other Parts Discussed in Thread: TAS5727

Hi...

My customer is designing TAS5727 (@PBTL mode, 50W) on their audio product.

But they are concerned that the reliability test spec of their end customer is the worst case.

The reliability test spec is as follows.

- Input source : sound source of mp3 file

- Output Power and Volume : 50W @4ohm, PBTL mode, Volume Max

- Test : Speaker Impedance is changed from 3.5ohm to 1.0ohm

   3.5ohm (Music play for 10 minutes) -->  3.0ohm (Music play for 10 minutes) -->  2.5ohm (Music play for 10 minutes) 

   -->  2.0ohm (Music play for 10 minutes) -->  1.5ohm (Music play for 10 minutes) -->  1.0ohm (Music play for 10 minutes) 

- Criterion (for judging)

   Normal operation of audio amplifier should do on 3.5ohm load.

   Normal operation of audio amplifier should do on from 3.0ohm to 1.0ohm if supply power of audio amplifier is turned off and on.

Is it possible or any problem?

Please let me know that.

Thanks.

  • 0
    TI__Guru 57800 points

    Hi, Jeffrey,

    When configured on PBTL mode, the minimum recommended load for the TAS5727 is 2 Ohm. The main issue with this test is related to the Overcurent protection of the device, most likely the device will trigger OCP when testing with 1.5 and 1 Ohm loads. We can only guarantee a correct operation of the device when the device is operated within the specs from the datasheet. Another thing I would like to mention is that when using power supplies for PVDD higher than 18V, the modulation index should be set to the minimum to avoid false OCP issues. 

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer