AH288 HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER Features General Description AH288 is a monolithic fan motor controller with Hall sensors On chip Hall sensor capability. It contains two complementary open-drain transistors Rotor-locked shutdown as motor coil drivers, automatic lock current shutdown, and Automatically restart recovery protections. Additional, frequency generator (FG) output Frequency generator (FG) output is for speed detection relatively. Built-in Zener protection for output driver Operating voltage: 3.8V~28V Rotor-lock shutdown detection circuit turns off the output driver Output current: I = 400mA O(AVE) when the rotor is blocked to avoid coil overheat. Then, the Lead Free Package: SOT89-5L (Note 1) automatic recovery circuit will restart the motor. These protected SOT89-5L: Available in Green Molding Compound actions are repeated and periodic during the blocked period. Until (No Br, Sb) the blocking is removed, the motor recovers and runs normally. Lead Free Finish/RoHS Compliant (Note 2) Typical Application Circuit D2 Vdd (24V) D1 Rpu 5 4 Coil2 FG 288 Coil1 1 2 3 D3 C1 48V GND * Rpu : typical 10 Kohm 48V Note: The optional Capacitor C1 and Diode D3 are for power stabilization. C1 is recommended to be E-Cap., luF/25V D3 is recommended to be Zener Diode, V =27V. Which C1and D3 Z value need to be fine tuned to optimize design for different coils and power suppliers . 24V DC Brush-less Fan with FG output function AH288 Rev. 12 1 of 9 APRIL 2010 DS31040 www.diodes.com Diodes Incorporated AH288 HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER Ordering Information AH288 - Y L - 13 Package Lead Free Packing L : Lead Free (Note 1) 13 : Tape & Reel Y : SOT89-5L G : Green Package Packaging 13 Tape and Reel Device Code (Note 3) Quantity Part Number Suffix AH288-YL-13 Y SOT89-5L 2500/Tape & Reel -13 AH288-YG-13 Y SOT89-5L 2500/Tape & Reel -13 Notes: 1. AH288-YL-13 will be replaced by AH288-YG-13 2. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at