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
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    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

    Administrator

    Apr 5, 2008
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  3. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    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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