TB6575 Brushless DC Motor Controllers Toshiba TB6575 Brushless DC Motor Controllers provide sensorless commutation and PWM current control for 3-phase full-wave BLDC motors. These controllers use DC excitation mode to improve the startup characteristic. The startup DC excitation time and forced commutation frequency can be changed. The speed of these motors is controlled by changing a PWM duty cycle via analog voltage. Other features include overcurrent protection, forward/reverse rotation, lead angle control, output polarity switching, and rotation speed sensing signal.