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TAS5827: Use Hybrid Modulation with TAS5827 default process flow

Stefan Finauer
Prodigy 20 points
Part Number: TAS5827


Tool/software:

Hi all,

I have EMI measurements coming up and would like to activate Hybrid Modulation on my TAS5827 amplifier board.

I know that Hybrid Modulation can be activated by setting bits 1-0 in DEVICE_CTRL1 register to 10, but the TAS5827 datasheet states in section 6.4.6.3 that I have to select a process flow in PPC3, which supports Hybrid Modulation. So I'm wondering which process flow is active in the amplifier by default? In case it's "Housekeeping" or "Lite Mode", this would mean that Hybrid Modulation is supported without having to load a full configuration from PPC3.

Second question: is there an easy way to verify if Hybrid Modulation is actually working?

Thank you very much!

Fini

  • 0
    TI__Genius 9195 points

    Hi Fini,

    There are a few process flows available in PPC3. The Lite Mode, Base/Pro and Base/Pro Hybrid will allow Hybrid modulation, but Base/Pro will only allow it in Stereo configurations.

    To verify hybrid modulation is working, you can probe a single leg of the output and step the input level. You will the midpoint of that output leg step up at certain thresholds.

    Regards,

    Ramsey

  • +1 in reply to Ramsey Foote
    Prodigy 20 points

    Hi Ramsey,

    thanks for your reply.

    I already knew that Hybrid Modulation can be activated by using an appropriate process flow in PPC3. The question was if it can also be activated without applying full register configuration from PPC3 output.

    However, your answer to my second question helped me finding the answer: I can see in the output that Hybrid Modulation works by simply activating it in DEVICE_CTRL1 register. No need to do anything else.

    With BD modulation, the mean output level of a single channel in BTL configuration is approximately half the supply voltage. With 1SPW modulation, the mean value is roughly 20% of PVDD. When Hybrid Modulation is active, the mean output level is approximately the same as with 1SPW for low audio levels and increases dynamically depending on the audio level.

    Thank you very much, this resolves my issue.

    Best regards,

    Fini