Introduction XAL-42 is an economical high performance driver based on one of the most advanced technologies in the world today. It is suitable for driving any 2-phase and 4-phase hybrid stepping motors. By using advanced bipolar constant-current chopping technique, it can output more speed and power from the same motor, compared with traditional technologies such as L/R drivers. Its 3-state current control technology allows coil currents to be well controlled, with relatively small current ripple and therefore less motor heating. Features * Low cost, high torque under high speed condition * Supply voltage from AC14V to AC35V or DC20V to DC50V, peak current up to 4.2A * Automatic idle-current reduction * Suitable for 2-phase and 4-phase stepper motors * Optically isolated input signals * 15 selectable resolutions, up to 25,600 steps/rev * PUL/DIR & CW/CCW mode optional * Small size (118*75.5*33mm)