26 August 2010
Two new full-bridge stepper-motor driver ICs, the A4986 and A4987, have been added to the family of motor driver
devices available from Allegro MicroSystems Europe.
The new devices are dual DMOS full-bridge stepper-motor drivers with parallel input communication and overcurrent protection, and offer improved microstepping accuracy along with high reliability.
Each device includes a fixed off-time pulse-width-modulation (PWM) current regulator, along with a 2-bit nonlinear digital-analogue converter that allows stepper motors to be controlled in full, half and quarter-step modes. Each full-bridge output of the A4986 and A4987 is rated at up to 35V and ±2A (A4986) or ±1A (A4987).
Internal synchronous rectification control circuitry is provided to improve power dissipation during PWM operation. Industry standard phase, I0 and I1 logic inputs are used to control each full-bridge, making it easy for the A4986 and A4987 to be used as replacements for most existing drivers.
www.allegromicro.com
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