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Can the TAS5727 reliably drive a 2 ohm load in PBTL mode?

Andrew Kimpel3
Prodigy 50 points
Other Parts Discussed in Thread: TAS5727

Hi TI,

I was wondering if it is possible for the TAS5727M to reliably drive a transducer with 2.3 ohms RL (including cable series resistance), in PBTL mode, PVDD = 18V. The TASW5727 datasheet indicates a RL (PBTL) minimum of 2 ohms. We would like to drive our transducer to fairly high output levels, and would like to know what the power limits of the TAS5727 are when driving a 2 ohm load. 

Our output filter is L = 15uH, C = 680nF.

We have tried this in the lab, and it appears to work. But we are concerned about long term reliability and risk of damaging the amplifier. It is possible we could add a small heatsink if necessary.

thanks in advance for your help / comments..

best,

Andrew Kimpel

  • 0
    TI__Guru 57800 points

    Hi Andrew

    The TAS5727 is able to work in PBTL mode with 2 Ohm load. Please refer to below plot:

    I would like to mention that with 2 Ohm load, the output power of the device will be limited above 20V in 2-layer boards. Thermal design for high power applications is important, so a 4 layer board and correct thermal layout is recommended. The use of a heat-sink may not be required, but it will depend on your application.

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer