Product category:
Stepper and Servo Drives, Motors, Controls
News Release from: Allegro MicroSystems Europe | Subject: SLA7042/44M motor controller/driver modules
Edited by the Engineeringtalk Editorial
Team on 03 April 2001
High current from microstepping motor
drivers
Allegro's SLA7042/44M are a range of motor controller/driver modules designed for the high-efficiency microstepping operation of 2-phase unipolar stepper motors
The SLA7042M and SLA7044M from Allegro MicroSystems Europe are a range of motor controller/driver modules designed for the high-efficiency, high-performance microstepping operation of 2-phase unipolar stepper motors The devices use an innovative power multi-chip module (PMCMTM) packaging technology which allows high-power NMOS FETs to be combined with monolithic CMOS logic/control circuitry, providing a cost-effective 'turnkey' solution for motor operation up to 3 A and 46 V
This article was originally published on Engineeringtalk on 19 Feb 2001 at 8.00am (UK)
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The combination of ratings and performance levels made possible by this technology offers significant benefits in stepper drive applications when compared to the higher dissipation and slower switching speeds associated with bipolar transistors.
In addition, the ability to carry out microstepping control provides improved resolution without limiting step rates, and provides much smoother low-speed motor operation.
The multi-chip technique lends itself to highly automated manufacturing processes, resulting in lower-cost devices with exceptional reliability.
Each half of the controller/driver module operates independently.
The devices include 4-bit shift registers which are serially loaded with motor phase information and output current-ratio data.
PWM current is regulated by appropriately choosing current-sensing resistors, a voltage reference, and digitally programmable current ratio.
Users can also select full-step, half-step or microstepping motor control.
Inputs are compatible with 5 V logic and microprocessors.
Each PMCM is rated for a maximum motor supply voltage of 46 V, and utilises advanced NMOS FETs for the high-current, high-voltage driver outputs.
The avalanche-rated FETs (rated at more than 100 V) provide excellent on resistance (fractions of an ohm), improved body diodes, and very fast switching, with a typical rise time of 0.5 ęs and fall time of 0.1 ęs.
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