AH5771

SINGLE PHASE HALL EFFECT LATCH SMART FAN

MOTOR CONTROLLER

AH5771 Rev. 3

1 of 6

JUNE 2009

DS31656

www.diodes.com

•

Support single-phase full wave min fan driver

•

Built-in Hall sensor input amplifier

•

Low voltage startup ( Vdd=2.5V )

•

Lock detection and automatic self-restart

•

Without external timing capacitor, Reduces the

numbers of external component required

•

Low profile package : SIP-4L

•

SIP-4L: Available in “Green” Molding Compound

(No Br, Sb)

•

Lead Free Finish / RoHS Compliant (Note 1)

AH5771 is the integrated Hall sensor with output drivers designed

for electrical commutation of brush-less DC motor application.

The device is as follows: one-chip Hall voltage generator for

magnetic sensing; the error amplifier that amplifies the Hall

voltage; a comparator is to provide switching hysteresis for noise

rejection; the full bridge driver for sinking and driving current load.

Internal band gap regulator is used to provide temperature

compensated bias for internal circuits and allows a wide

operating supply voltage range. The device includes features

such as Rotor Lock Protection with rotor lock detection and

automatic self-restart to avoid damage to the coil when the rotor

is blocked. AH5771 is rated for operation over-temperature range

from -40

℃ to 100℃ and voltage range from 2.5V to 15V. The

device is available in low profile package SIP-4L.

O1

O2

POWER

D2

C

AH5771

D1

Note: D2 (Zenor Diode) and Capacitor C are for power stabilization, D2 is recommended to be 18Vz (option),

C is recommended to 0.1uF ~1uF (E-Cap). D1 (reverse Diode) is for reverse voltage protection.

Features

General Description

Typical Application Circuit