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TPS92692: How to calculate power consumption for TPS92692

JAEWOONG CHUNG
Prodigy 140 points
Part Number: TPS92692

Hello team. 

We would like to make sure that TPS92692 is being used within a safe temperature range.

To do so, we need to know the power consumption of the TPS92692, but we can't find anything related to the datasheet.

Could you tell me how to calculate the power consumption or the recommended package temperature range of TPS92692?

- VIN=24

-VOUT=28~34V 

-Imax=6.0A 

-Fsw=200kHz

  • 0
    TI__Mastermind 18890 points

    Hi Jaewoong,

    The package temperature range can operate up to 150C junction and has thermal shutdown at 175C.  Be sure to follow our recommended layout for the part on figure 59 to get the heat out to a ground plane.

    What are you measuring as the temperature of the TPS92692 now? 

    Calculating power dissipation of the part you will have to measure input current and therefore power then calculate the output switching power to the FET and subtract from it.  You can use table 7.4 to help calculated the temperature but this can get miss-leading if you do not have the part layout properly with figure 59 and how the board is getting the heat out (thermal impedance of the board).  Because this is a high power design, other high heat component if it's near the TPS92692 will also heat up the part.  Another word, I would recommend you to measure the temperature directly at the highest ambient temperature you plan to operate at to get what you need.

    Thanks Tuan

  • 0 in reply to Tuan Tran74
    Prodigy 140 points

    Hello. Tuan.

    At room temperature of 24°C, the temperature on the top of the case of TPS92692 is 60°C.

    Layout is as similar as figure 59 in datasheet as possible.

    The maximum usage temperature we are expecting is 40 degrees.

    Please tell me which pin I should use to measure the input current of TPS92692.

    Thank you.

  • 0 in reply to JAEWOONG CHUNG
    TI__Mastermind 18890 points

    Hi Jaewoong,

    If you follow the our recommended design in the data sheet or evaluation board then there should be a 10 Ohm resistor from your input supply to VIN of the TPS92692.  The voltage on this resistor will give you the current into the TPS92692.

    Thanks Tuan