NRND = Not Recommended for New Design
Two Phase BLDC All-In-One Fan and Motor Driver with Output Zener Clamp
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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. To help protect the motor coils, the AH285 provides Rotor Lock Protection which shuts down output drives if rotor lock is detected. The device automatically re-starts when the rotor lock is removed. 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.
| Average OutputDrive Current (mA) | 500 |
|---|---|
| Frequency Generator (FG) and Rotation Detect | - |
| Lock Detect, Shut-Down and Auto Start | Yes |
| Operating Ambient Temperature (°C) | -40 to 100 |
| Operating Point Bop Gauss (Max) | 60 |
| Operating Point Bop Gauss (Min) | 10 |
| Operating Point Bop Gauss (Typ) | 30 |
| Operating Voltage (V) | 3.8 to 20 |
| Peak Output Current (mA) | 700 |
| Release Point Brp Gauss (Max) | -10 |
| Release Point Brp Gauss (Min) | -60 |
| Release Point Brp Gauss (Typ) | -30 |
| SupplyCurrent (mA) | 2 |
| Typical Total RDS(ON)(NMOS and PMOS Combined) | 1.25 @ 12V |
| Typical Zener Breakdown Voltage (V) | 42 |
