Worcester, Mass. - Combining low-power CMOS logic with high-current, high-voltage power FET outputs, the Series SLA706xM translators/drivers from Allegro Microsystems Inc. provides a complete control and drive from a two-phase unipolar stepper motor with pulse-width modulation (PWM) control of the output current in a power multichip module. There are no phase-sequence tables, high-frequency control lines or complex interfaces to program, according to Allegro.
The CMOS logic section provides the sequencing logic, direction control, synchronous/asynchronous PWM operation and a "sleep" function. The minimum clock input is said to be an ideal fit for applications where a complex microprocessor is unavailable or overburdened. Transistor-transistor logic or low-power Schottky TTL may require the use of appropriate pull-up resistors to ensure a proper input-logic high.
For PWM current control, the maximum output current is determined by the user's selection of a reference voltage or sensing resistor.
The NMOS outputs are capable of sinking up to 1, 2 or 3 amps (depending on device) and withstanding 46 volts in the off-state. The SLA7060 and 7061M are 1-A output devices; the 7061/7066 are 2-A units and the 7062/7067 are 3-A devices.
The series SLA706xM comes in a 21-pin single in-line power tab package with leads formed for vertical mounting. The device is rated for continuous operation between -20 degrees C and 85 degrees C.
The SLA7060xM series is mainly aimed at circuit design engineers involved in microstepping motor controller applications, specifically copy machines, scanners and robots.
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