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TPS92520-Q1: Accuracy of temperature measurement

Zhang Jason
Prodigy 175 points
Part Number: TPS92520-Q1

Hello,
Pls find my questions below:

(1) There are three temp sensor in TPS92520, one(let's call it as sensor_A) is situated right in the middle of the part in between the two channels, and the other two(let's call it as sensor_B and sensor_C) are situated in between HS FET and LS FET for each channel. Is this right? 

(2) For sensor_A, it is measured and reported to TEMPL/H[9:0], so what is the accuracy of this sensor_A measurement?

(3) For sensor_B and sensor_C, they are used to protect the FET from over-temperature, so what is the threshold for this? Is there hysteresis for this protection? And what is the accuracy of sensor_B and sensor_C?


Thanks.

  • 0
    TI__Mastermind 23226 points

    Hello Zhang,

    1)  You are correct.  Sensor B and C are purely analog temp sensors that are there to protect each channel.

    2)  Sensor A is measured from ADC and those specs are in the datasheet.

    3)  Yes there is hysteresis but I we don't specify it and I will have to research to find out what it is.  The accuracy isn't specified either because it is considered a fault condition when this happens.  Generally speaking, I have found that on the bench it is within a few degrees of what I have measured.    

    -fhoude