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Bipolar stepper driving ?

Discussion in 'Electronic Design' started by Hammy, Feb 10, 2009.

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  1. Hammy

    Hammy Guest

    I have some steppers (bipolar 4-wires) from printers I would like to
    test.

    This is the motor I'm trying to test.
    http://i40.tinypic.com/3532vrk.png

    Full motor datasheet
    http://www.mitsumi.co.jp/Catalog/pdf/motor_m42sp_6nk_e.pdf

    I bought some Toshiba LDMOS bipolar drivers TB6598FN.
    Typical application. This is my schematic exactly the same.
    http://i43.tinypic.com/2kkh8n.png

    Simplified block diagram of driver.
    http://i43.tinypic.com/2gx3add.png

    Truth table
    http://i44.tinypic.com/2i0asl0.png

    Full Datasheet TB6598FN
    http://www.semicon.toshiba.co.jp/do...IC/TB6598FN_TB6598FNG_en_datasheet_060306.pdf

    The motors are getting a regulated 12Vdc and the driver gets 5Vdc.

    My questions.

    From the datasheet for best performance my control signals should be
    about 400Hz? 50% or less duty?

    How should my control signals be for forward stepping?

    The truth table just shows EN1&2 high,IN1&2 LOW. If I pulse IN1&2
    they will go from forward to reverse and back again.

    What should the sequence be to the four control pins for simple
    forward stepping?

    I'll be using a PIC probably just 12f508 for my control signals.
     
  2. Hammy

    Hammy Guest

    The TB6598FN is a dual H-BRIDGE IC.

    The problem is they show one "EN" and one "IN" line going to each
    bridge or actually they show it going to a box labelled bridge.

    http://i43.tinypic.com/2gx3add.png

    I know I have to pulse each arm in sequence but what is what from the
    diagram?

    They don't say which line controls which N-channel and P-Channel
    combo. The truth table is even more confusing they say if EN1&2 are
    high and IN1&2 are low the motor will move in the forward direction. I
    dont want to pulse one bridge for forward movement and then pulse the
    other one for reverse.

    I'm trying to figure out the sequence I would have to pulse the four
    control lines for forward rotation.

    http://i44.tinypic.com/2i0asl0.png
     
  3. Guest

    it isn't best datasheet I've seen, but it is clear what the pins
    does.

    EN1/2 pins enable or disable the h-bridge, when low all transistors
    are off.

    IN1/2 pins control the h-bridge when the EN1/2 is high.

    just so set EN1 and EN2 high and toggle IN1 and IN2

    IN1: 110011001100
    IN2: 011001100110



    -Lasse
     
  4. Hammy

    Hammy Guest

    Thank you

    I wasnt sure.
     
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