Diodes Incorporated AH285
The AH285 is a single-chip solution for driving two-coil brushless direct current (BLDC) fans and motors. The device includes a Hall-effect sensor, dynamic offset correction and two complementary open-drain output drivers with internal Zener diode protection. The device automatically re-starts when the rotor lock is removed.| Part No. | AH285 |
|---|---|
| Datasheet | AH285 Download |
| Manufacturer |  Diodes Incorporated |
| Description | HALL-EFFECT SMART FAN MOTOR CONTROLLER |
| Buy | Stock & Price |
DESCRIPTION
Pin Assignments To help protect the motor coils, the AH285 provides Rotor Lock Protection which shuts down output drives if rotor lock is detected. A Tachometer output is provided by open-drain Frequency Generator (FG) Pin which allows external interface to monitor motor rotation or speed. The FG output is the magnetic change frequency. The AH285 is available in SOT89-5L package. (Top View) Vdd 1 5 FG GND 2 285 DO 3 74 DOB SOT89-5LFEATURES
APPLICATIONS
● Single-chip solution● Operating Voltage: 3.8V to 20V
● Built-in Hall sensor and input amplifier
● Tachometer (FG) output
● Rotor Lock Protection (Lock detection, output shutdown and automatic re-start)
● Built-in Zener protection for output driver
● Average output current up to 500mA
● Packaged in SOT89-5L
● Green Molding Compound
● Two-coil BLDC cooling fans
● Low to medium voltage, low power BLDC motors Typical Application Circuit Vdd (12V) D2 FG D3 D1 Rpu C3 54 285 123 GND Coil2 Coil1 R1 R2 C1 C2 Notes: 12V DC Brush-less Fan with FG output function 1.
