Allegro MicroSystems' A3965 is a motor-control IC for the pulse-width-modulated (PWM) current control of low voltage stepper motors. A DMOS dual full-bridge driver, it is capable of output currents to ±500 mA and operating voltages to 20 V and is particularly suited to low-power or battery-operated motors where minimal power consumption is desired.
The device is designed for operation from logic supplies of between 2,85 and 5,5 V. The low power consumption is aided by a 'sleep' mode which disables all circuitry and typically draws less than 1 µA supply current from motor and logic supply.
During operation, the fixed frequency 'on' pulses of each H-bridge within the device are offset 180° out of phase to minimise the peak demand required of the motor supply, allowing savings in size and cost of external power-supply components. 'Phase' and 'enable' input terminals are provided for use in controlling the speed and direction of a stepper motor with externally applied PWM control signals.
Internal circuit protection includes thermal shutdown with hysteresis, undervoltage monitoring of drive voltage and charge-pump voltage, and crossover current protection. Special power-up sequencing is not required. It comes in a 24-lead plastic SOIC with a copper batwing tab.
For more information contact Simon Churches, Arrow Altech Distribution, 011 923 9600, info@arrow.altech.co.za
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