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TPA3144D2: Bead filter calculate formula

Patrick Chen
Mastermind 8875 points
Part Number: TPA3144D2

Hello

           Below is Class D LC filer calculate formula. But if add bead not L on output of TPA3144D2, the LC filer formula could be used to calculated by bead ? or has any filter formula by bead+cap for filer design? Thank you. 

 

BR

Patrick

  • 0
    TI__Expert 6720 points
    Hi Patrick,

    Regarding the ferrite bead selection, you can refer TPA3144D2 datasheet 10.2.2.1 section.

    What's more, the typital impedence requriement is at least 300ohm @100Mhz. Rated current / magnetic ocre materials ( linearity at audio band) / DC resistance (small for better efficiency) / snubber are needed to take into considerations.

    There is no specific calculation for beads, just to make sure the bead + cap resonant frequency is less than 10MHz.

    Could you share the inductor tool link to me? (matthew-miao@ti.com)

    Rdgs,
    Matthew