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DRV134: Power Dissipation Calculations

Hayden_Hast
Intellectual 1515 points
Part Number: DRV134

Hello,

I'm working on calculating the power dissipation from the DRV134 in my circuit. There doesn't seem to be any mention of it in the datasheet other than the Iq and many of the internal resistors in the functional block diagram do not have shown resistances.

Do you have any insight on how to calculate the power dissipation of the DRV134?

Thanks,

Hayden

  • 0
    TI__Guru* 98965 points
    Hi Hayden,

    The information available regarding dissipation for DRV134 is the following:
    Junction Temperature Max (Tj Max)
    Tj (Max) = 150 °C

    Typical Power dissipation (Pd typ)
    PD (TYP) = [ (V+) + |V-| ] IQ = [ (18) + |-18| ] (5.2 mA) = 187.2 mW

    Maximum Power dissipation (Pd max)
    PD(MAX) is based on the Tj(MAX) of 150 °C
    PD(MAX) = ( Tj(MAX) - TA)) / θja θja = 80 °C/W for the SOL-16 package, TA = 25 °C
    PD(MAX) = ( 150 °C - 25 °C) / 80 °C/W = 1.56 W

    Best regards,
    -Ivan Salazar
    Audio Applications Engineer - Low Power Audio & Actuators
  • 0 in reply to Ivan Salazar
    TI__Intellectual 1515 points

    Thanks Ivan, very helpful! Didn't know if there was anything special to take into considerations or just the IQ x Voltage difference.

    Regards,

    Hayden

  • 0 in reply to Hayden_Hast
    TI__Intellectual 1515 points
    Sorry to open this back up, one more question.

    In your power dissipation equation, I'm assuming it's only accounting for the internal needs to power up. Does it account for the power lost through the 50ohm resistors as current is provided through Vo? My application has a floating 740ohm resistor between Vo+ and Vo- so I believe the current through that resistor wouldn't be negligible and would cause some power dissipation across the 50 ohm internal resistors, correct?

    Regards,
    Hayden
  • 0 in reply to Hayden_Hast
    TI__Guru* 98965 points
    Hayden,

    I think your comments are correct regarding typical power dissipation estimation. This estimation is taking into account the quiescent current. Quiescent current should be lower than active/loaded situation. Unfortunately there are no more details on power dissipation estimation.
    However there is the maximum power dissipation estimation that you could use for design purposes if needed. Even in active state the device should be within this estimated value.

    Best regards,
    -Ivan Salazar
    Audio Applications Engineer - Low Power Audio & Actuators