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UC2903: Sensing a negative voltage level

Vijay Kumar43
Prodigy 10 points

Part Number: UC2903

 I need to monitor +15V & -15V opamp power supplies. I'm having some difficulty understanding the concept behind sensing a negative voltage level using SENSE 4 & SENSE 4 INVERT INPUT lines.

  • 0
    TI__Genius 12630 points

    Vijay,

    Figure 6 shows how to configure the device for negative voltage sensing. The idea is to use the internal comparator that is set in the inverting configuration. Pin 5 is the inverting input and connected to ground because Pin 3 is GND. So by applying a negative voltage across R2 with the negative side on the bottom and the positive side at Pin 5, this will detect negative voltage. The negative voltage is scaled using R1/R2 * 2.5V.

    Please let me know if this is clear.

    -Michael

  • 0 in reply to Michael_DeSando
    Prodigy 30 points

    Thanks a lot Michael for the explanation.

    Your inputs, in addition to the data provided in the datasheet, have helped me understand the concept better.

    Regards,

    Vijay