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Original question:

TAS6424-Q1: TAS6424-Q1 driving 85W@3Ohm

TAS6424-Q1: 25V and 2 Ohm speaker allowed or forbidden?

Thomas Loehner
Prodigy 30 points
Part Number: TAS6424-Q1
Other Parts Discussed in Thread: TAS6424

Our System configuration of the TAS6424 requires to connect a 2 Ohm speaker to one of the outputs and at the same time 3 times a 4 Ohm speaker. The supply voltage is 25V because of another TAS6424 which is in PBTL configuration for 2 times 120W @ 2 Ohm. Both TAS6424 are connected to the boosted voltage,

I know that there will be the current limitation feature which leads to distortion on the 2 Ohm speaker. But if our audio DSP limits the input signal of the TAS6424 by 6dB the output to that speaker should not reach the current limitation.

Is this scenario with limited audio signal on the 2 Ohm Speaker at 25V supply allowed?

I ask this question because I read somewhere that the limit of the supply voltage in case of 2 Ohm Speaker is 18V. In my System it would be 25V but I take care not to run into current limitation.

Kind Regards

Thomas

  • 0
    TI__Mastermind 34305 points

    Hi Thomas,

    The 18V limitation is due to the thermal limitation at 2 ohms across all channels.  If you limit the maximum voltage in your DSP, you should be able to meet your needs.  You will need to be diligent in your thermal design for this system configuration.