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TAS5825M: Need Official Ferrite Bead Reference Design of TAS5825

Wayne Chen (Audio AE)
Genius 15950 points
Part Number: TAS5825M
Other Parts Discussed in Thread: TAS5805

Hello Sirs,

The TAS5825 datasheet explains that a ferrite bead plus a capacitor can replace a LC filter while the TAS5825 EVM demonstrated 10uH+0.68uF LC filter design only. 

Would you please provide official suggestion of the ferrite bead and the maximim output capacitance for the TAS5825? We tried to reuse TAS566's 1000pF reference design but the combination seems not optimized for the TAS5825.

Customer needs our suggestion to solve thermal problem, hence we need product line's suggestion as soon as possible.

TAS5766 Example (SLOU387 reference design)

Thank you and Best regards,

Wayne Chen
04/28/2019


  • 0
    TI__Expert 6295 points
    wayne,

    what is PVDD and max output power? for ferrite bead selection, you can refer to Murata inductor which used on TAS5805 EVM. by the way, to improve thermal, did you set device to "1SPW mode, low Freq to 384K" etc.?

    regards
    Linda
  • 0 in reply to Xiaolin Qin
    TI__Genius 15950 points

    Thank you for your concern, Linda.

    19V PVDD, 384kHz, 1SPW modulation with spread spectrum enabled in most cases. The TAS5805 EVM uses 1000pF cap with FB for BTL output. Would you please provide suggestion of output capacitance for PBTL?



    Thank you and Best regards,

    Wayne Chen
    04/29/2019

  • 0 in reply to Wayne Chen (Audio AE)
    TI__Expert 6720 points
    Wayne,

    Here are the normal cap selection considerations:

    Take the capacitor value and idle current trade-off into account. Larger capacitor means larger idle current. Increase the capacitor value from 1nF to 2.2nF makes much help for frequency band 5MHz~100MHz. Normally the resonant frequency of the Ferrite Bead / cap filter should be less than 10MHz.

    Rdgs,
    Matthew