Diodes AH5792 User Manual
Ah5792, Description, Pin assignments
AH5792
SINGLE PHASE HALL EFFECT LATCH SMART
FAN MOTOR CONTROLLER
AH5792
Document number: DS314641 Rev. 6 - 2
1 of 10
July 2010
© Diodes Incorporated
Description
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.
Pin Assignments
5
4
3
2
1
V
SS
FG
O1
O2
Vdd
NC
( Top View )
SOT553
1
2
3
74
5
Vdd
O1
Vss
FG
O2
( Top View )
NC
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