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SLA7051M

Allegro MicroSystems
Part Number SLA7051M
Manufacturer Allegro MicroSystems
Description UNIPOLAR STEPPER-MOTOR TRANSLATOR/PWM DRIVER
Published Sep 24, 2005
Detailed Description or r t o ive M r D SLA7051M UNIPOLAR STEPPER-MOTOR TRANSLATOR/PWM DRIVER Combining low-power CMOS logic with high-curr...
Datasheet PDF File SLA7051M PDF File

SLA7051M
SLA7051M

Overview
or r t o ive M r D SLA7051M UNIPOLAR STEPPER-MOTOR TRANSLATOR/PWM DRIVER 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 (PMCM™).
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 Data Sheet 28210C* 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.
The SLA7051M is supplied in an 18-pin single in-line power-tab package with leads formed for vertical mounting (suffix LF871) or horizontal mounting (suffix LF872).
The tab is at ground potential and needs no insulation.
For high-current or high-frequency applications, external heat sinking may be required.
This device is rated for continuous operation between -20°C and +85°C.
ABSOLUTE MAXIMUM RATINGS Driver Supply Voltage, VBB .
46 V Load S...


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