Motor Drivers, Stepper | LB1946

PWM Current Control Stepping Motor Driver

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Overview

A stepping motor driver 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 micro-stepping 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.

  • Carriage drive and paper feed in printers

  • PWM current control with a fixed off time
  • Logic input serial-parallel converter (allows 1-2, W1-2, 2W1-2 and 4W1-2 phase excitation drive)
  • Built-in upper and lower side output diode
  • Current attenuation switching function (with slow decay, fast decay and mixed decay modes)
  • Simultaneous on state prevention function (through current prevention)
  • Noise canceller function
  • Thermal shutdown circuit
  • Shutoff on low logic system voltage circuit
  • Low-power mode control pin

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