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TLV320AIC3110: How to calculate power consumption from the spec?

Wang Mike
Prodigy 40 points
Part Number: TLV320AIC3110

From the specification, we have Tj(max)=105℃ and  Ta=85℃, Rθja=32.7℃/W, Rθja=23.3℃/W

Can we use Tj = Ta+ Θja * P to calculate the power consumption? Is Ta=85℃ when  Tj(max) is 105℃?

In other words, which formula is correct in this figure?

thanks.

  • 0
    TI__Mastermind 22950 points

    Hello Mike,

    Power dissipation depends on the voltage and load, which is figured out first, then back calculated to see if Tj (junction temperature) operating at Ta (expected operating environment) will be exceeded.  This is done to see if you may need additional airflow or some external heat sink to dissipate heat from the device before it gets too hot.

    Regards,

    Aaron