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TPS65320D-Q1: Junction temperature estimation?

Julio Apps
Expert 3665 points
Part Number: TPS65320D-Q1

Team,

Do you have an excel calculator or something to estimate junction temperature for the TPS65320D-Q1? I am trying to see if i can run the DC/DC at 7.2V/650mA and the LDO at 5V/100mA.

  • 0
    TI__Genius 16030 points
    Hi Julio,

    I couldn't find a power calculator tool online, so I'm copying Frank to see if he has one.

    But you can calculate the power loss using these formulas.

    Pldo_loss = (Vin-Vout) * Iout
    Pbuck_loss = Pbuck - Pinductor - Pdiode

    where

    Pbuck = [(Vout * Iout) / Eff] - (Vout * Iout)
    Pinductor = Iout^2 * Ldcr
    Pdiode = [1 - (Vout/Vin)] * Iout * Vf (Vf = forward voltage of rectifying diode)

    Regards,
    Karl
  • 0 in reply to Karl Wallinger
    TI__Genius 9615 points

    Hi Julio,

    I do not have a tool either. You can find a more detailed calcualtion in datasheet Section 8.2.1.2.11 Power Dissipation.

    Please also consider that the LDO is supplied directly from VBAT in case the Buck is disabled, hence it needs to drop VBAT voltage to 5V (@100mA?).

    Best regards,

    Frank

  • 0 in reply to Karl Wallinger
    TI__Expert 3665 points

    Karl,Frank,

    Appreciate the help, i was just wondering if there was a quick tool but ill go ahead and estimate with the provided equations. Thanks!