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AH5792

SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER

Diodes Incorporated. 

AH5792

SINGLE PHASE HALL EFFECT LATCH SMART

FAN MOTOR CONTROLLER

Description

Pin Assignments

The AH5792 is a single chip solution for driving single-coil

brush-less DC fans and motors. The AH5792 employs a

bidirectional full bridge driver output stage for single coil fan

motor applications. 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.

The AH5792 also offers an externally controlled Tachometer

(Frequency Generator Pin) open -drain output which makes it

easier to connect with external interface such as hardware

monitoring. The FG is half (1/2) the magnetic change

frequency.

The devices are packaged in SOT553 and SOT89-5L small

outline packages for applications such as small motors like

vibration motors or ultra thin cooling fans.

( Top View )

O2 1

5 FG

VSS 2

O1 3

SOT553

NC

4 Vdd

( Top View )

O2 1

5 FG

Vss 2

NC

O1 3

74 Vdd

SOT89-5L

Features

• Support single-phase full wave min fan driver

• Built-in Hall sensor input amplifier

• Low voltage startup ( Vdd=1.8V )

• Lock detection and automatic self-restart

• Without external timing capacitor, Reduces the numbers

of external component required

• FG output

• Low profile package : SOT553 and SOT89-5L

• “Green” Molding Compound

Applications

• 3.3V / 5V Min. DC Fans (Eight Pole)

• Low Voltage / BLDC Motors

• Micro-Vibration Motors

AH5792

Document number: DS314641 Rev. 6 - 2

1 of 10

www.diodes.com

July 2010

© Diodes Incorporated

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