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UC2625: UC2625 ISense Range

Timothy Thompkins
Prodigy 10 points
Part Number: UC2625

I have a question about what is intended by the ISENSE Range specified in the UC2625 datasheet. It states a minimum range of -1V and a maximum of 2V. I take this to mean that at either pin you can see a min of -1V and a max of +2V (with the UC2625 referenced to GND). This would imply then that your total dynamic measurement range is 6V (ISense1 being -1V and Isense2 being +2V and vice versa). Am I interpreting this correctly? Thanks.

  • 0
    TI__Mastermind 18900 points

    Hello Timothy,

    The team has been notified of your question and should answer relatively soon.

    Best,
    -Cole

  • 0
    TI__Mastermind 18900 points

    Hello Timothy,

    The best way to interpret the spec. is that the common mode voltage of ISense1 and ISense2, which means these values can be between -1V and 2V. With that said, the maximum difference between ISense1,2 can be +/-0.5V (this information can be found in the Device Terminal description section and using Figure 7 in the datasheet).

    As a result, making ISense1= -1V and ISense2=2V or ISense1= -2V and ISense2=-1V are an invalid inputs compared to ISense1= -1V and ISesnse2= -0.5V. The differential voltage and common mode voltage range depends on the voltage rails and of the current sense amplifier. Since the current sense amp is internal, it cannot be changed.

    Hope this helps,

    -Cole