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TIDA-020033: Class-H using Buck Controller

Muwei Zheng
Intellectual 1850 points

Part Number: TIDA-020033
Other Parts Discussed in Thread: TAS6584-Q1, LM5143

Tool/software:

Hi team,

I want to know if it is possible to use a buck controller(e.g. LM5143) to make a Class-H tracking power supply for TAS6584-Q1? It seems we only have reference design with boost controller, but I guess buck controller may have a similar design to support Class-H function. Is there any concern to use buck controller for Class-H?

Our customer has both 48V and 12V power supply on their board, so they can use buck controller to get a 20V PVDD from 48V input for TAS6584-Q1, which seems to have better efficiency than boost topology. 

Customer requirement:

- Input: 48V or 12V

- Output: 45W x4 speakers

Thanks,

Muwei Zheng

  • 0
    TI__Intellectual 2915 points

    There is no problem with this. 

    Conceptually, you're removing the high switching losses the amp would experience with a larger PVDD voltage and pulling them out into the buck. The buck efficiency will likely be better overall than the what the amp would handle when the audio amplitude is lower. 

    The lower the output voltage for the buck, the less efficient it will be, but the lower the class-H voltage also equates to lower total power needed by the amplifier so the losses will be pretty low.