AH288 Datasheet | Diodes Incorporated

Features HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER General Description - On chip Hall sensor - Rotor-locked shutdown - Automatically restart - Frequency generator (FG) output - Built-in Zener protection for output driver - Operating voltage: 3.8V~28V - Output current: IO(AVE) = 400m A - Lead Free Package: SOT89-5L (Note 1) - SOT89-5L: Available in “Green” Molding pound (No Br, Sb) - Lead Free Finish/Ro HS pliant (Note 2) AH288 is a monolithic fan motor controller with Hall sensor’s capability. It contains two plementary open-drain transistors as motor coil drivers, automatic lock current shutdown, and recovery protections. Additional, frequency generator (FG) output is for speed detection relatively. Rotor-lock shutdown detection circuit turns off the output driver when the rotor is blocked to avoid coil overheat. Then, the automatic recovery circuit will restart the motor. These protected actions are repeated and periodic during the blocked period. Until the blocking is removed, the motor recovers and runs normally. Typical Application Circuit Vdd (24V) D2 D1 Rpu FG D3 C1 - Rpu : typical 10 Kohm Coil2 Coil1 48V 48V Note: The optional Capacitor C1 and Diode D3 are for power stabilization. C1 is remended to be E-Cap., lu F/25V; D3 is remended to be Zener Diode, VZ =27V. Which C1and D3 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 DS31040 1 of 9 .diodes. APRIL 2010 © Diodes Incorporated Ordering Information HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER - Y L - 13 Package Y : SOT89-5L Lead Free L : Lead Free (Note 1) G : Green Packing 13 : Tape &...