Product category:
Power Supply ICs and Controllers
News Release from: Allegro MicroSystems Europe | Subject: SLA7042M and SLA7044M
Edited by the Electronicstalk Editorial
Team on 03 April 2001
High-efficiency microstepping motor
modules
The SLA7042M and SLA7044M from Allegro MicroSystems Europe are motor controller/driver modules for two-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 two-phase unipolar stepper motors The devices use an innovative power multichip module packaging technology which allows high-power N-channel mosfets to be combined with monolithic CMOS logic/control circuitry, providing a cost-effective 'turnkey' solution for motor operation up to 3A and 46V
This article was originally published on Electronicstalk on 30 Aug 2000 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 multichip 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 4bit 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 5V logic and microprocessors.
Each device is rated for a maximum motor supply voltage of 46V.
The avalanche-rated FETs (rated at more than 100V) provide excellent on resistance (fractions of an ohm), improved body diodes, and very fast switching, with a typical rise time of 0.5us and fall time of 0.1us.
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