Toshiba launches industry’s first single-chip sensorless sine wave ASSP for BLDC motors

Unlike MCU-based alternatives, the new device is a cost optimised state machine which does not even require programming. Specifically, the TB6582FG takes the analogue speed inputs supplied by a host microcontroller and provides a complete full-wave sine wave PWM drive output without the need for additional processing. The sinusoidal motor coil current waveform provides for smoother BLDC motor operation and lower electrical and acoustic noise than is possible with conventional PWM outputs while still allowing designers to realise the benefit of PWM efficiency.

Toshiba has integrated on-board circuitry that accurately calculates rotor speed and position using phase current information, allowing designers to eliminate the need for Hall sensors. This not only reduces component count but also improves application reliability, while making the TB6582FG ideal for applications where addition of sensors is not practical or commercially unviable.

The TB6582FG features a built-in triangular wave generator with a carrier wave frequency of fosc/252Hz and an integrated dead time function that allows safe operation of the power FETs in a push-pull configuration. Control of motor rotation speed in both forward and reverse directions is achieved by changing the PWM duty cycle based on the input from the host microcontroller.
Suitable for operation with supply voltages from 6.5V to 16.5V, the new motor controller SoC features an on-board regulator that provides a typical reference voltage of 5V. Lead angle adjustment capability allows designers to tune their applications for optimum efficiency.