3-Phase Full-Wave PWM Driver for Sensorless DC Motors

Features

• Sensorless drive in three-phase full-wave mode

• PWM chopper control

• Controls the PWM duty cycle based on an analog input (7-bit ADC)

• Output current: IOUT = 0.6 A typ. (1 A max)

• Power supply: VM = 4.5 V to 22 V (25 V max)

• Forward and reverse rotation

• Lead angle control (0°, 15° and 30°)

• Overlapping commutation (120°, 135° and 150°)

• Selectable duty cycle modulation period upon state transitions of phase signals

• Rotation speed detecting signal (FG_OUT)

TB6633FNG: 3 pulses per electrical degree

TB6633AFNG: 1 pulses per electrical degree

• Adjustable startup settings

• Forced commutation frequency control (fosc / (6 × 217), fosc / (6 × 218) and fosc / (6 × 219))

• Selectable PWM frequency

• Restart feature

• Overcurrent protection (ISD)

• Thermal shutdown (TSD)

• Undervoltage lockout (LVD)

• Current limiter

• Short brake control