180 ° sine signal drive - low audible noise and vibration

    The motor position is obtained according to Allegro‘s sensorless algorithm without external Hall sensor

    Speed closed-loop control, PWM speed regulation

    FG (speed) and RD (locked rotor) output feedback

    Single power supply, 5V-18V

    CW/CCW direction control

    Lower output impedance Rdson

    Two phase lead settings are provided: linear phase lead and automatic phase lead

    Low standby current – standby current is less than 10mA

    High integration is conducive to reducing the area of PCB, and less external components can reduce the overall cost

    Integrated EEPROM programmable, programmable speed curve, reduce MCU and further reduce design cost

    Locked rotor protection – shut down the output after detecting locked rotor, and restart after maintaining for a period of time

    Over-current limit (OCL) – Over-current limit can be programmed. When the current reaches the over-current limit value, it is closed for a period of time and then reopened (no external current limiting resistance is required)

    Overcurrent protection (OCP) – OCP value is higher than OCL value. After current pumping OCP, the output is closed without restarting. Mainly used for short circuit protection

    Undervoltage protection

    Over-temperature protection - the chip automatically turns off when the chip junction temperature exceeds 165 degrees

    Power supply voltage startup compensation – when the input voltage fluctuates, it automatically compensates during startup to ensure a wide range of reliable startup

    Soft start – programmable soft start reduces the impact current on the power supply

    Sleep mode – standby current is less than 10uA

    Anti-reverse - if the fan rotates in the correct direction at the moment of starting, A5931 will continue to start normally and enter closed-loop control

    If the fan turns in the opposite direction at the moment of starting, A5931 immediately brakes and then starts again.