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Smart amp IV sensing for speaker protection

Jung-Ho Seo
Expert 5940 points
Other Parts Discussed in Thread: TAS2557, TAS2560

Dear experts,

In smart amp application,  Could you explain how to know speaker thermal/excursion data from the IV sensing for speaker protection ?

Thanks,

JH.

  • 0
    TI__Genius 9670 points
    Hi JH!

    We have a few different algorithms, which device or power level are you most interested in?

    Thanks,
    Brian
  • 0 in reply to Brian Burk
    TI__Expert 5940 points

    Hi Brian,

    Thanks for feedback. I just want to understand generally how to protect speaker by IV sensing. So, Device name or power level is not matter but TAS2557 is one of my interests.

    Thanks,

    JH.

  • 0 in reply to Jung-Ho Seo
    TI__Guru** 109525 points
    Hi JH,

    The devices featuring IV sense have an internal ADC that receives the voltage/current measurement from the speaker (through VSENSE pins) and takes it to digital data so it can be used for speaker protection algorithms.
    Devices with IV sense only, like TAS2560, senses this voltage/current data and sends it back to the host processor, through I2S or PDM outputs. This data is received by the host processor, which then performs speaker protection algorithms and controls the signal coming into the amplifier (TAS2560 in this case).
    In the other hand SmartAmp devices, like TAS2557, have an internal DSP that supports Texas Instruments SmartAmp speaker protection algorithms, so the sensed voltage/current is processed internally and the host processor only needs to send digital audio data without any other processing required.
    Peak current and Peak voltage which will give full scale digital output are specified in the data sheet Electrical Characteristics section. This information is useful in case an external processor is used to perform speaker protection algorithms.

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