High voltage, High current operational amplifier selection to drive a 1 ampere valve

Discussion in 'General Electronics Chat' started by navidelec, Oct 16, 2014.

  1. navidelec

    Thread Starter New Member

    Jul 12, 2014
    I need to choose a High voltage, High current operational amplifier to drive a servo valve with voltage range of +15,-15 and current 1 ampere, for amplification of current in a driver circuit.
    1- I have already chosen opa544t, but in it's datasheet specified "2A min" for output current, it's mean that this op-amp couldn't drive my 1A valve?
    2- Does anybody have better suggestion, I wonder if you help me?
  2. bertus


    Apr 5, 2008
    navidelec likes this.
  3. MikeML

    AAC Fanatic!

    Oct 2, 2009
    No, it means that it is guaranteed to drive up to a 2A load while meeting the Vol and Voh specs.

    Obviously, if you run it with no load, the opamp will happily drive the output pin to a voltage determined by the feed back. As the load resistance is decreased, ultimately the opamp will reach a point where it can no longer supply enough current, which is spec'ed to be 2A
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