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TAS5805MEVM: Why the cap is different for two channels of TAS5805MEVM?

Marc Liu
Intellectual 2860 points
Part Number: TAS5805MEVM

Hi Team,

Why channel 2 has so large C24/C25 compare to channel 1? What's the design purpose?

Besides, there is Ferrite Bead L5 in datasheet reference design. When does it need?

Thanks for your help!

Marc 

  • +1
    TI__Prodigy 110 points

    Hello Marc,

    Channel 2 has this bulk electrolytic caps to be able to handle conditions where we drive low frequency signals at high output power (e.g. subwoofer/PBTL). So it has to have larger decoupling capacitors (C24/25) to help stabilize the PVDD under these conditions that drive higher output power without compromising sound quality.

    The L5 ferrite bead is used to filter the input supply voltage coming from what's generating the system's PVDD rail (e.g. an SMPS). The EVM doesn't have this ferrite filter since it is typically connected to a regulated bench power supply. Whether L5 is necessary depends on how clean the PVDD source rail is being sent into the device.

    Hope this helps.

    Regards,

    Prithvi