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OPA1642: vs. OPA1652 Output voltage vs. Output current

Sarah Cratem
Intellectual 805 points
Part Number: OPA1642
Other Parts Discussed in Thread: OPA1652

Hi team,

The following two sets of Output Voltage vs. Output Current characteristic curves seem to behave in opposite manners. 

For OPA1642, the output current (limit) appears to increase with increasing temperature.

For OPA1652, the output current (limit) appears to decrease with increasing temperature.

Why is that?

Thanks,

Sarah

  • 0
    TI__Mastermind 22630 points

    Sarah,

    I am currently looking into this. I will need a few days to discuss with the design team for clarity. Thank you for your patience. 

  • +1
    TI__Mastermind 22630 points

    Sarah,

    The processes and designs are different such as bipolar vs cmos output stage and design requirements at the time. Typically in order to avoid thermal runaway devices will be designed such that the short circuit current is reduced with increasing temperature. In the case of the OPA1642 there is thermal protection with internal thermal shutdown circuitry if the die temperature exceeds approximately 180 degrees C. One or both methods may be chosen by the designer depending on process and design requirements.