LB1946.PWM Current Control Stepping Motor Driver.Datasheet

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The LB1946 is stepping motor drive IC
that implements PWM current control bipolar drive with a fixed off time. This
IC features 15-current setting levels using a fixed VREF voltage and supports for microstepping drive from 1-2 phase
excitation to 4W1-2 phase excitation drive. This device is optimal for driving stepping motors such as those used for
carriage drive and paper feed in printers.
In the photo, the chip is used in the Epson stylus photo 900 printer
 
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    PWM current control with a fixed off time
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    Logic input serial-parallel converter (allows 1-2,
    W1-2, 2W1-2, and 4W1-2 phase excitation drive)
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    Current attenuation switching function (with sl
    ow decay, fast decay, and mixed decay modes)
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    Built-in upper and lower side output diodes
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    Simultaneous on state prevention function (through current prevention)
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    Noise canceller function
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    Thermal shutdown circuit
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    Shutoff on low logic system voltage circuit
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    Low-power mode control pin