Toshiba releases three-phase sine wave PWM driver

Toshiba Electronics Europe has expanded its range of integrated single-chip motor drives with a three-phase sine wave PWM driver.

The driver will lower the component count, reduce the noise and improve the efficiency of brushless DC (BLDC) motor applications.

The TB6585FG ASSP (application specific standard product) integrates commutation logic, sine wave PWM generation, Hall sensor amplification and motor drive power stage into a 36-pin HSOP.

Designed for powers up to 45W and operating across a 4.5V to 36V input range, the IC can deliver a maximum current of 1.8A.

It is ideal for use in home appliances, pumps and fans and industrial motion control.

The device 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 minimises electrical and acoustic noise when switching between positive and negative polarities in the driver circuit.

This promotes more efficient operation and reduces vibrations, enhancing 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 improves design flexibility.

Back to top