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AH2985 Hall Effect Fan Motor Controller

Diodes' AH2985 includes a Hall effect sensor, dynamic offset correction and two complementary open-drain output drivers with internal Zener diode protection.


Diodes' AH2985 includes a Hall effect sensor, dynamic offset correction, and two complementary open-drain output drivers with internal Zener diode protection. It is optimized for low start-up voltage. To help protect the motor coils, AH2985 provides rotor lock protection, which shuts down output drives if rotor lock is detected. The device automatically restarts when the rotor lock is removed. Over-temperature shutdown provides thermal protection for the device. The AH2985 is available in industry-standard TO94 package.

Features
  • Built-in Hall sensor and amplifier with low temperature coefficients
    • All-in-one integrated solution significantly reduces external components
    • Highly stable solution and works with cheaper, lower strength magnets
  • Integrated complementary open-drain output driver
    • Supports two-phase motor driver up to 500 mA average load current
    • No external power switches required, reducing the component count, PCB area, and overall system cost
  • Lock detection and automatic self-start without external capacitor
    • Helps to protect coil from overheating or burn-out during rotor lockout
    • Automatic restart when the rotor lock is released
  • Reverse voltage diode on input and Zener clamp protection on output
    • Help protection coil and output device; safe, reliable, and robust operation
  • Operating temperature range -40°C to 105°C
    • Suitable for thermally demanding enclosed cooling fan applications
Applications
  • Two-coil BLDC cooling fans
  • Power supply cooling fans
  • PC and notebook cooling fans
  • Low-voltage/low-power BLDC motors

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