Diodes Incorporated AH284
The AH284 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. | AH284 |
|---|---|
| Datasheet | AH284 Download |
| Manufacturer |  Diodes Incorporated |
| Description | HALL-EFFECT SMART FAN MOTOR CONTROLLER |
| Buy | Stock & Price |
DESCRIPTION
Pin Assignments To help protect the motor coils, the AH284 provides Rotor Lock Protection which shuts down output drives if rotor lock is detected. The AH284 is available in SIP4 and SOT89-5L packages. (Top View) (Top View) 284 Vdd 1 1 : Vdd 5 NC 2 : DO GND 2 284 12 3 4 SIP-4L 3 : DOB 4 : GND DO 3 74 DOB SOT89-5LFEATURES
APPLICATIONS
● Single-chip solution● Operating Voltage: 3.8V to 20V
● Built-in Hall sensor and input amplifier
● Rotor Lock Protection (Lock detection, output shutdown and automatic re-start)
● Built-in Zener protection for output driver
● Average output current up to 500mA
● Packages: SIP-4L and SOT89-5L
● Green Molding Compound
● Two-coil BLDC cooling fans
● Low to medium voltage, low power BLDC motors Typical Application Circuit (Note 1) 12V Vdd D2 D1 284 L2 L1 1234 GND D3 C3 DO DOB R1 C1 R2 C2 Notes: 1. Typically it is recommended to us a 56 Ohm resistor for R1 and R2 and a 2.2μF E-Cap capacitor for C1, C2 and C3. These values may need to be optimized depending on the coils used.
