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TAS5756M: LC filter - inductor grade selection

qwert trewq
Intellectual 395 points
Part Number: TAS5756M

Hi,

I am using Ti TAS5756M, the output speaker load is 8ohms, so as per the calculations given in the application report SLOA119  L=22uH and C=0.68uF is required.

My query is regarding the LC filter

Many inductor manufactures are recommending Class-D coupled inductor for audio applications for better performance but in TAS5756M datasheet there are no recommendation for Class-D coupled inductor.

my concern is whether to go with normal power inductor or with coupled inductor. 

If you are suggesting class D inductors could you please mention the part number.

Thanks. 

  • 0
    TI__Expert 6720 points

    Hi,


    It's suggested to use below ClassD LC Filter Designer for quick LC value selection. In order to save BOM cost, 10uH + 0.47uF should be the tradeoff with slight 20kHz boost.

    As for audio coupled inductor, good linearity / low losses / minimal crosstalk btw two inductors definitely benefits better audio performance, however, it normally introduces expensive cost. Our datasheet audio performance data is collected with EVM BOM inductors. Once it can meet your system requirements, then no specific audio inductor is needed for tradeoff. 

    Recommended inductors part number can be refered SLOA119.

    What's your system audio requirement? We have the last generation TAS58x5 and TAS578x to replace TAS5756/4. Please email me (matthew-miao@ti.com) for more detailed discussion.

    http://www.ti.com/tool/LCFILTER-CALC-TOOL?keyMatch=classD%20LC%20filter%20design&tisearch=Search-EN-Everything

    Regards,

    Matthew