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UC3907 Load Share Controller Overcurrent indication

Mark Nohr
Intellectual 570 points
Other Parts Discussed in Thread: UC3907

I am using this load share controller and am looking to provide a status signal when the overall load exceeds a certain amount.

  • 0
    TI__Mastermind 34465 points
    An external amplifier can be used to measure the load current on CS+ an CS- pins. When this currents exceeds a predetermined level then the system can indicate that this limit has been tripped.
    Regards,
    John Griffin
  • 0 in reply to John Griffin1
    Intellectual 570 points

    Thanks John,

    I'm using a circuit configuration identical to figure 15 found in www.ti.com/.../slua147.pdf "APPLICATION NOTE U-129 UC3907 LOAD SHARE IC SIMPLIFIES PARALLEL POWER SUPPLY DESIGN".  I am using two power sources (POE+) that each trip off at ~30W.

    I was in the process of designing a circuit to sum the voltages tapped from Pin 9 of each UC3907 and am referencing the system ground (pin 2) to the non inverting op amp input. I figured the total voltages was proportional to the total power used by the system.

    Is this what you are suggesting?

    Is there an application circuit you would have me reference?