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LM9061 Maximum Load Current Threshold

Donald Jones
Mastermind 22610 points
Other Parts Discussed in Thread: LM9061, LMP8601, LMP8480, LMP8646

After calculating the LM9061 Maximum Load Current Threshold against the min/max/typical limits for the variables, the possible range for the threshold is not acceptable.

What can be done to improve the LM9061 threshold accuracy?

  • 0
    TI__Mastermind 22610 points

    Precision current limit threshold was never a design requirement for the LM9061.

    Since the final Vref/Iref circuit accuracy is determined by a collection of internal variances, there is no proven simple external method to improve overall accuracy and still use the internal sense and protection circuitry as designed.

    There are other devices that can sense current with accuracy, and these devices can be used as feedback into a control interface for the LM9061. See Precision Current Sensing Amplifiers LMP8480, LMP8601, LMP8646, etc, for examples. Alternately, a design employing a sensing MOSFET along with a ground referenced op-amp/comparator could possibly be designed to be used as feedback into a control interface for the LM9061.

     However, the obvious trade-off for having higher accuracy with LM9061 is the higher cost and complexity due to the external support circuitry for Precision Current Sensing.

  • 0 in reply to Donald Jones
    TI__Genius 10370 points
    Hi,

    I apologize that no one has followed up with your question. I'm going to close this thread, but if you still have a question please feel free to post a brand new thread instead of replying to this one. We will do our very best to respond within 24 hours to any new post you might have :-)

    Best Regards,
    Aramis P. Alvarez