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Using just one amplifier in TAS5751

Howard Chamberlin
Prodigy 130 points
Other Parts Discussed in Thread: TAS5751M

My application uses two TAS5751 chips - one in PBTL mode to drive a 4-ohm woofer and the other to drive a 6-ohm tweeter.

So for the tweeter amplifier, I really only need one channel.  So, in the interest of saving some power, parts and PCB area is it

allowable to:

1) Make no connection to the outputs of the unused amplifier output pins (OUT_C, OUT_D, BSTRP_C, BSTRP_D)

2) Connect but omit bypassing of the 2 PVDD pins powering the unused amplifier

I plan to use the PWM Shutdown Group Register, 0x19 to keep the unused C-D channel off and not switching.

HAL

  • 0
    TI__Guru 57800 points

    Hi, Howard,

    For the unused channel of the TAS5751M, the LC-filter components can be removed as long as the PWM signals of the unused channel are placed in shut-down mode via I2C (Register 0x19, write 0x3A to shutdown out CD) before entering normal operation, during the initialization phase.  BSTRP Caps can be removed, but is recommendable to keep them. 

    PVDD pins should be connected to the power supply. The bulk capacitor on the side of the unused channel can be removed, but it is recommended to keep the high frequency decoupling capacitor (0.1µF). 

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer