Preliminary Datasheet
Single Phase Full-wave Low Voltage Fan Motor Driver
AM9799
General Description
The AM9799 is a single-phase DC brushless motor
driver IC featuring BiCMOS process. It is suitable for
fan motor drivers for low voltage equipment such as
the note personal computers. The AM9799 includes
lock shutdown, automatic restart, frequency generator
(FG), have been incorporated into one chip. When the
motor is under lock condition, lock shutdown
function turns off the output current. When the lock
condition is removed, the IC automatically restarts
and allows DC fan to run. In addition, the FG
function is to output rotation speed signal. It features
MOS-FET driver circuit for better saturation
characteristics. Slew late of amplifiers and feedback
resistors are optimized to achieve low-noise motor
operation.
The AM9799 is available in MSOP-8 package.
Features
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Lock Detection and Rotational Speed Sensing
Mechanisms are Built-in
Rotor-locked Protection and Automatic Restart
When the Motor Lock is Undone
Hall Bias Built-in and Hall Inputs Have a
Hysteresis
Built-in Thermal Shutdown Circuit
Built-in Over Current Protection
Operating Voltage: V
CC
=2V to 6V
BiCMOS Technology
Compact Package: MSOP-8
Applications
•
CPU Cooler
Computers
Fan
in
Notebook
Personal
MSOP-8
Figure 1. Package Type of AM9799
Sep. 2009
Rev. 1. 0
1
BCD Semiconductor Manufacturing Limited
BCDSEMI [ BCD SEMICONDUCTOR MANUFACTURING LIMITED ]
