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TPA3106D1: What are the power current requirements?

johny radio
Expert 1280 points

Part Number: TPA3106D1

What are the current requirements of the TPA3106? Looking at the datasheet, it seems like a 3A source might be sufficient, maybe even 2A.

  • 0
    TI__Mastermind 24835 points
    Hi Johny,
    The current requirement depends on your output power from the device and power supply voltage. When we do some experiment with TPA3106D2 on bench, generally we use a 3~4A Max power supply to reserve enough margin.
    There is a simple way to estimate the power current. The first, you need to know the maximum output power from TPA3106D2 in your application . Then in figure 17~19 in the datasheet, you can find the efficiency in your case, then calculate the total power consumption, then calculat the maximum power current. Please also reserve enough magin above the result.
    Best regards,
    Shawn Zheng
  • 0 in reply to Shawn Zheng
    Expert 1280 points

    Hi Shawn

    My application:

    gain: 36 dB
    supply: 26 V
    load: 8 ohm

    by fig 19, i guess my efficiency is about 85%, by looking at 39 W position. But not really sure if 39 W is correct position to look at.

    so, by fig 20, i guess my current is about 1.5 A, which does not sound correct to me.

    what difference between power consumption and power current?

    (D1, by the way, not D2  :)

  • 0 in reply to johny radio
    TI__Mastermind 24835 points
    Hi Johny,
    Total power consumption = power supply voltage x power supply current.
    Form Figure 19, the efficiency should be around 85%, then the total power consumption= ouput power/ efficiency = 39/0.85=45.9W. The current on power supply = total power consumption/power supply voltage=45.9/26=1.77A.
    Best regards,
    Shawn Zheng