Allegro has developed a new series of three phase BLDC fan drivers that result in low audible noise and vibration in addition to improved efficiency. These new sinusoidal driven ICs include both sensor-based and sensor less commutated ICs. Typical IC features include: PWM duty or analog voltage for speed control, adaptive phase advance for improved efficiency, rotor lock detection with auto restart, FG speed output, over current protection, under voltage lockout, thermal shutdown and few external components for small PCB footprints and reduce system cost. Target applications include desktop and notebook PCs, refrigerator and other white good products, ceiling and consumer fans and industrial fans and blowers. For automotive applications Allegro has a series of AEC-Q100 qualified fan driver ICs targeted at seat cooling fans, LED headlamp fans, and battery cooling fan applications
The A5936 is a three phase sensorless BLDC fan driver IC that incorporates sinusoidal drive to minimize audible noise and vibration
Automatic phase advance Easy to select start-up parameters with resistor divider Low power sleep mode Supply compensation Forward and reverse wind milling Reduces audible noise and vibration Automatically adjusts commutation timing to maximize efficiency reducing supply consumption Use PWM or analog voltage to control motor speed