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Piezo Pulse Amplifier

Discussion in 'Electronic Design' started by J. McMillan, Nov 16, 2003.

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  1. J. McMillan

    J. McMillan Guest

    I am working on a system that will drive a piezoelectric inkjet head.
    A microcontroller and a digital to analog converter is being used to
    produce a controlled pulse shape (a specific rise time, hold time, and
    fall time).

    This pulse then needs to be amplified from 5 volts to the 15 to 30 volt
    range. The pulses will have rise and fall times in the 1 us to 20 us
    range.

    I have seen a solution that uses the Apex line of high voltage/high slew
    rate opamps but I think those might be overkill and I am looking for
    something cheaper.

    Does anyone have any implementation suggestions?

    Sincerely,
    James McMillan
     
  2. Robert Baer

    Robert Baer Guest

    Why not a direct drive system. where the driver is turned on and off,
    the supply voltage being what you need, and use series and shunt
    resistors to control rise and fall times (the piezoelectric head being
    the capacitance)?
    If need, parallel a capacitor to the head.
     
  3. Bill Sloman

    Bill Sloman Guest

    Check out the Texas Instruments (was Burr-Brown) OPA552

    http://focus.ti.com/lit/ds/symlink/opa551.pdf

    It seems to offer the voltage swing you need, and slew rate
    (24V/usec).

    It isn't stable for closed loop gains of less than five, but you seem
    to need a gain of six, so that shouldn't be a problem. Farnell list
    them for about $5 in small quantities, which seems reasonable
    (certainly wehn comapred with Apex prices).
     
  4. James Meyer

    James Meyer Guest

    I'd be tempted to look at adding a single transistor, emitter follower
    with gain, to the output of almost any fast op-amp and closing the feedback loop
    around the whole thing. You did say the rise and fall times are already being
    generated by the micro, didn't you?

    Jim
     
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