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Original question:

TPA3255-Q1: About heat dissipation structure

TPA3255-Q1: Efficiency And Other Component Options

Pete Sampson
Intellectual 440 points
Part Number: TPA3255-Q1
Other Parts Discussed in Thread: TPA3255

1) From my measurements the TPA3255-Q1 itself uses ~6 Watts while running. Are there ways I can decrease the power the chip uses to make it more efficient? It uses 6 Watts whether or not it is connected to anything.

2) Is there a better or more efficient chip for driving a 2 Ohm load at 10 Watts? The efficiency of the chip is only ~50% at that level.

  • 0
    TI__Mastermind 49750 points

    Hi Pete

    1. Choose a larger inductor and smaller PWM frequency, will help to the efficiency. But the efficiency won't be very good since TPA3255 can give up to 600W with 2Ohm resistor, can't expect too much on only 6W output. 

    2. You can check device like TPA3128/TPA3110/TPA3112. 

  • 0 in reply to Shadow He
    Intellectual 440 points

    Thanks, two remaining questions:

    1) In the devices such as the TPA3128/TPA3110/TPA3112, why does the efficiency go up when the supply voltage goes down?

    2)How do these work with a low power factor? Power factor isn't mentioned in the datasheet.

  • +1 in reply to Pete Sampson
    TI__Mastermind 49750 points

    Hi Pete

    1. PVDD voltage will impact on the MOSFET switching loss directly. Use the lowest PVDD as you needed.

    2. We don't have the data for this. You can replace Active Power P in the datasheet into Apparent Power S, if the power factor is not 1. The results shouldn't change too much.