Toshiba expands SoC motor control family

The TB6585FG ASSP (application specific standard product) integrates commutation logic, sine wave PWM generation, Hall sensor amplification, motor drive power stage and protection functionality into a single, 36-pin HSOP package. Designed for powers up to 45W and operating across a wide 4.5V to 36V input range, the new IC can deliver a maximum current of 1.8A. As a result it is ideal for applications such as home appliances, pumps and fans and industrial motion control.

Toshiba’s new device is a complete motor driver solution that uses an analogue signal input to modify PWM duty cycle and control forward or reverse motor rotation speed. A triangular waveform generated on-chip is combined with the buffered and amplified inputs from three Hall Effect sensors to generate a modulated waveform. This is then used to produce the three synchronised commutation waveforms needed to drive the motor.

By providing sinusoidal waveforms to drive motor phases Toshiba’s TB6585FG helps to minimise electrical and acoustic noise when switching between positive and negative polarities in the driver circuit. This not only promotes more efficient operation, but also helps to reduce vibrations and, so, enhance reliability. The ability to control lead angle allows the designer to tune the delay between current and voltage phases and further improve efficiency in the target application.

The TB6585FG offers configurable modes for improving motor start-up characteristics and has built-in protection against overcurrent conditions. The ability to detect excessive commutation frequency and low rotation speed further improves design flexibility.