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MC33030 and NJM2611 Servo Controller Input signals

Discussion in 'Electronic Design' started by Terry, May 17, 2007.

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  1. Terry

    Terry Guest

    I have been learning about servo motor controllers and have a question
    on the input signals required for each of these IC's.

    I just want to make sure I understand things correctly before I choose
    which controller to go with. Please correct me if I am wrong.

    It looks as if the MC33030 requires a constant voltage at the input
    which determines the position of the servo. This voltage would need
    to be generated by a PWM to voltage converter if driving the circuit
    with a standard RC pulse signal. Datasheet can be found here:
    http://www.onsemi.com/pub/Collateral/MC33030-D.PDF

    On the other hand, the NJM2611 looks as if the input signal is just
    the standard RC PWM signal. This chip must have an internal PWM to
    voltage converter (linear one shot block?). Datasheet can be found
    here: http://rocky.digikey.com/scripts/ProductInfo.dll?Site=US&V=190&M=NJM2611D

    The MC33030 looks to have much better features as far as braking,
    overcurrent, and overshoot, but requiring some additional external
    circuitry for a PWM signal to drive it.

    Am I understanding these two IC's correctly?

    Thanks in advance for any help.
     
  2. joseph2k

    joseph2k Guest

    My best sugestion is to get one or two of each and tinker with them. Then
    report back, some of us are interested.
     
  3. Terry

    Terry Guest

    That's what I'm going to do. I am designing my RC controller for a
    project I am working on. I am mostly interested because it seems that
    the MC33030 uses a reference voltage that will be very easy to
    generate with the ADCs that our on the micro I am using. I woudn't
    have to use any PWM signals.

    I will purchase a couple of both and post my results. It might be a
    little while though.
     
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