A89306 50 V Ultra-Low-Noise FOC Motor Controller

Allegro's A89306 is a 3-phase sensorless brushless DC (BLDC) motor driver (gate driver) that can operate from 5.5 V to 50 V. A field-oriented control (FOC) algorithm is fully integrated to achieve the best efficiency and acoustic noise performance. Constant torque and power modes are provided, as well as constant speed and open-loop operating modes. The device optimizes the motor startup performance from a stationary condition, a windmill condition, and a reverse windmill condition.

The motor output, speed, torque, or power is controlled through analog, PWM, or using I²C. A universal speed/power/torque duty curve is stored in EEPROM and allows for flexible control schemes. An optional clock mode is available for closed-loop speed control, with a programmable clock frequency to rpm ratio. A simple I²C interface is provided for setting motor-rated voltage, rated current, rated speed, resistance, and startup profiles. The I²C interface can be used for on/off control, output control, and speed and status readback. The A89306 is available in a surface-mount 28-contact 5 mm x 5 mm QFN (suffix ET) package. The package has an exposed pad for enhanced thermal dissipation, is lead (Pb) free, and 100% matte-tin lead-frame plating.