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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 tech-
nique with short and open circuit protection (with a Fault LED). A transformer is required to power up the
driver.
Bilevel Drive
The basic function of a motor driver is to provide the rated motor phase current to the motor windings in
the shortest possible time. The bilevel driver uses a high voltage to get a rapid rate of current rise in the
motor windings in the least amount of time. When reaching the preset trip current, the driver turns off the
high voltage and sustains the current from the low voltage supply.
What Is a Step Motor Driver?
A step motor driver is a device that takes input signals (usually Clock and Direction) and translates this
information into phase currents in the motor. 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.
• Bilevel Driver Operation
• 10 Amps per Phase Operating Current (Kick Current)
• 7 Amps per Phase Standstill Current
• 70 Volt Operation
• Short Circuit Protection
• Open Circuit Protection
• Unipolar Operation
• Motor ON/OFF Input
• Half-Step and Full-Step Operations
• Fault LED
• Detachable Terminal Block
• CE Certified
• Compact and Rugged
• Available in Driver Packs
Features
FIGURE 1: Step Motor Driver
Half-Step/Full-Step
Users have a choice of full-step operation or half-step operation. Full-step operation occurs by energizing
two phases at a time, rotating a typical motor 1.8 degrees per step. Half-step operation occurs by alter-
nately energizing one, and then two, phases at a time, rotating the motor 0.9 degrees per step. Full-step
operation is suggested for applications that specifically require that mode, such as when retrofitting exist-
ing full-step systems.