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Related Links:

Datasheets:
SLA7051M: Unipolar Stepper-Motor Translator/PWM Driver (PDF)

Selection Guides:
Power Motor Drivers - Unipolar Stepper

when this product is updated

Press Releases:
SLA7051M: Allegro MicroSystems, Inc. Announces a New Sanken Unipolar Stepper-Motor Translator/PWM Driver

SLA7051
Unipolar Stepper-Motor Translator/PWM Driver

Features

• 2 A Output Rating
• Internal Sequencer for Full or Half-Step Operation
• PWM Constant-Current Motor Drive
• Cost-Effective, Multi-Chip Solution
• 100 V, Avalanche-Rated NMOS
• Low rDS(on) NMOS Outputs (700 milli-ohms typical)
• Advanced, Improved Body Diodes
• Half-Step and Full-Step Unipolar Drive
• Inputs Compatible with 3.3 V or 5 V Control Signals
• Sleep Mode
• Internal Clamp Diodes

Description

Combining low-power CMOS logic with high-current, high-voltage power FET outputs, the SLA7051M translator/driver provides complete control and drive for a two-phase unipolar stepper motor with internal fixed off time, pulse-width modulation (PWM) control of the output current in a power multi-chip module (PMCMT).

The CMOS logic section provides the sequencing logic, direction, full/half-step control, synchronous/asynchronous PWM operation, and a "sleep" function. The minimum CLOCK input is an ideal fit for applications where a complex µP is unavailable or overburdened. TTL or LSTTL 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 and sensing resistor. The NMOS outputs are capable of sinking up to 2 A and withstanding 46 V in the off state. Ground-clamp and flyback diodes provide protection against inductive transients. Special power-up sequencing is not required.

Full-step (2 phase) and half-step operation are externally selectable. Two-phase drive energizes two adjacent phases in each detent position (AB-BC-CD-DA). This sequence mode offers an improved torquespeed product, greater detent torque, and is less susceptable to motor resonance. Half-step excitation alternates between the one-phase and two-phase modes (A-AB-B-BC-C-CD D-DA), providing an eight-step sequence.

Functional Block Diagram

Complete Part Numbers

Part Number	Package Type	RoHS Compliant	Part Composition/ RoHS Data	Temperature	Comments	Samples	Distributor Stock
SLA7051MLF871	18-lead ZIP	Yes	--	-20 °C to  85 °C	new
SLA7051MLF872	18-lead ZIP	Yes	--	-20 °C to  85 °C	new

Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.