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Dual TAS5624 & TAS5558 supporting 4 channel and 8 channel with same hardware

Steve Clynes1
Prodigy 115 points
Other Parts Discussed in Thread: TAS5558, TAS5624, TAS5624A

In my system I want to use the same hardware to support either 4 or 8 speaker channels under software control using a single TAS5558 and two TAS5624 power stages (will not dynamically change whilst operational, obviously).

How should I connect the 16 PWM outputs from the TAS5558 to the two TAS5624 PWM inputs? I could not find a clear explanation in either datasheet.

BR,

Steve

  • 0
    TI__Mastermind 37045 points

    Hi Steve,

    TAS5624A would be configured in the SE mode with 8 channels and 2 TAS5624As. See attached SE sch example below.

     

     

    Connect TAS5558's PWM_P_x to INPUT_x of the TAS5624A. For example, for 8 channels config -

    PWM_P_1 tie to INPUT_A (TAS5624A_1)

    PWM_P_2 tie to INPUT_B (TAS5624A_1)

    PWM_P_3 tie to INPUT_C (TAS5624A_1)

    PWM_P_4 tie to INPUT_D (TAS5624A_1)

    PWM_P_5 tie to INPUT_A (TAS5624A_2)

    PWM_P_6 tie to INPUT_B (TAS5624A_2)

    PWM_P_7 tie to INPUT_C (TAS5624A_2)

    PWM_P_8 tie to INPUT_D (TAS5624A_2)

     

    reg,

    Paul.

     

  • 0 in reply to user5276421
    Prodigy 115 points

    Paul,

    Just to clarify...

    With this arrangement it is possible to then also connect the speakers across the upper and lower halves of each bridge so that each TAS5624 is driving 2 speakers instead of 4, then configure the TAS5558 to send opposite phases PWM to AB & CD so that the same hardware can be used for single ended and bridged?

    BR,

    Steve

  • 0 in reply to Steve Clynes1
    Prodigy 115 points

    Paul,

    Any update on this clarification please since we are about to send our board for fab and I would like to make sure I don't need to add any additional signal switching to support both 4 and 8 channels, and that the solution you presented will allow a purely software selectable switching,

    BR,

    Steve

  • 0 in reply to Steve Clynes1
    TI__Mastermind 37045 points

    Hi Steve,

    For BTL mode, you may set the TAS5624A to 1N+1 AD Mode (refer to DS pg5 Mode Selection Pins). Single-ended input do have a increased DC offset on the output terminals.

     

    reg,

    Paul.

     

     

  • 0 in reply to user5276421
    Prodigy 115 points

    Perfect. thanks Bud.

    BR,

    Steve