AH2985
Description
The AH2985 is a single-chip solution for driving two-coil brushless direct current (BLDC) fans and motors. The device includes a Halleffect sensor, dynamic offset correction and two plementary open-drain output drivers with internal Zener diode protection. It is optimized for low start-up voltage.
To help protect the motor coils, the AH2985 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. Over temperature shutdown provides thermal protection for the device.
Pin Assignments
(Top View)
The AH2985 is available in TO94 package.
12 3 4
1 : VDD 2 : DO 3 : DOB 4 : GND
Features
- Single-Chip Solution
- Operating Voltage: 2.5V to 15V
- Built-in Hall Sensor and Input Amplifier
- Rotor Lock Protection (Lock Detection, Output Shutdown and
Automatic re-Start)
- Built-in Reverse Voltage Protection Diode
- Built-in Zener Protection for Output Drivers
- Average Output...
