Each time the step motor driver receives a pulse, the step motor moves one step. If the driver receives 200 pulses, the motor moves 200 steps. The motor steps at the same frequency as the clock pulses. FIGURE 1: Step Motor Driver General Description The BLD72 is a step motor driver that can drive motors rated from 1 to 7 amps/phase (unipolar rating). It can handle 6 lead and 8 lead motors. This driver features a unipolar bilevel (or dual voltage) drive technique with short and open circuit prote

5 Transformer Drawings 3.750 MAX 4.500 3.100 2.500 1.450 MAX 1.500 .800 MAX 2.350 3.570 3.000 Figure 6: Transformer Dimensions Note: The AA2793 transformer is the same physical size as the AA2791, but it has two sets of secondary windings (to power two drivers) and a dual primary winding for 115/230V operation. Figure 8: AA2793 Transformer Specs Figure 7: AA2791 Transformer Specs 6 Figure 9: Wiring for different line voltages for the AA2793 transformer. 7 Dimensions Drawings Figure 10: BLD72 Dim