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TPA3116D2: The power consumption issue of the TPA3116D2 chip in PBTL mode.

ling li
Prodigy 30 points
Part Number: TPA3116D2

Tool/software:

Hello, use tpa3116d2 to design the power amplifier, the load is 4ohm, the power supply is 24V, and the output L = 33uh, C = 0.68uf. PWM = 400khz.
SDZ and MUTE controlled via dsp.

Power-on sequence: 24V on--- > SDZ_HIGH --- > MUTE_LOW

When MUTE (LOW), the 3116 starts to work, observe the 24V power supply, and the current increases by 0.014A (no audio input, no load). Touch the 3116 chip Power∞ to warm up.
Is it normal?
I remember that this current is related to 33uh inductance, differential mode impedance, or common mode impedance.? But it can't be calculated, how to calculate it? Thanks...

  • 0
    TI__Intellectual 2795 points

    Hi Ling,

    When the mute pin is low and the SDZ pin is high, the device will be in mute mode. This means there will be switching on the output but no audio output. With the output FETs on, you can expect heat to be generated.

    The worst case current going into the device in mute mode can be seen in section 6.5 of the datasheet.

    Regards,

    Ramsey