Microstepping driver ICs have built-in sequencing

The SLA706xM Series is a new family of unipolar microstepping two-phase constant-current motor driver ICs with built-in sequencing capabilities.

The SLA706xM Series is a new family of unipolar microstepping two-phase constant-current motor driver ICs with built-in sequencing capabilities.

The new devices provide a complete unipolar microstepping motor driver solution, including a built-in translator designed to operate unipolar stepper motors with a simple step input.

There is no need for phase-sequence tables, high-frequency control lines, or complex interfaces to program.

Combining low-power CMOS logic with high-current, high-voltage power FET outputs, the Series SLA706xM translator/drivers provide complete control and drive for a two-phase unipolar stepper motor with internal fixed off-time and pulsewidth modulation (PWM) control of the output current.

The CMOS logic section provides the sequencing logic, direction, control, synchronous/asynchronous PWM operation, and a sleep function.

The built-in translator and sequencing circuitry make the devices an ideal fit for applications where a complex supervisory microprocessor or microcontroller is unavailable or overburdened.

The NMOS outputs are capable of sinking up to 1, 2 or 3A (depending on device) and withstanding 46V in the off state, and clamp diodes provide protection against inductive transients.

Half, quarter, eighth and sixteenth step operation is externally selectable for the SLA7060/61/62M, while full-step (two-phase), half, quarter and eighth step operation is externally selectable for the SLA7065/66/67M.

The two-phase drive sequence mode offers an improved torque-speed product, greater detent torque, and lower susceptibility to motor resonance.

Key electrical parameters include an output rating of up to 3A, 100V avalanche rated NMOS outputs, low on-resistance (150mohm typical) NMOS outputs, and inputs compatible with 3.3 or 5V control signals.

The SLA706xM series is primarily targeted toward circuit design engineers of microstepping motor-controller applications such as photocopiers, scanners and industrial robots.

The devices are offered in a 21-pin single-inline power-tab package.

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