A5931 three-phase non-inductive BLDC brushless DC fan driver IC
Time:2023-02-25
Views:1242
Description:
The A5931 three-phase sensorless BLDC fan driver IC integrates a sine signal drive function to minimize audible noise and vibration.
Integrate flexible closed-loop speed control system into IC. This eliminates the need for microprocessor-based systems and minimizes programming requirements.
A5931 devices are available in automotive and commercial grade.
Main features and advantages
180 ° sine signal drive - low audible noise and vibration The motor position is obtained according to Allegro‘s sensorless algorithm without external Hall sensor
A5931:20W single chip three-phase motor without Hall sine wave drive
Suitable for applications: about 20W fan, server cooling fan, exhaust fan, leafless fan, water pump and other three-phase brushless motor control applications
Main advantages:
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.
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