AM9789
SINGLE PHASE FULL-WAVE MOTOR DRIVER FOR SILENT FAN MOTOR
Description
Pin Assignments
(Top View)
The AM9789 is a low noise fan driver for driving a single-coil
brushless direct current (BLDC) fans and motors. The integrated
output staged uses BTL technology to minimize the audible noise and
OUT2
EMI generated by the motor commutation. The AM9789 is highly
integrated and includes PWM speed control, standby mode, internally
generated Hall bias and a Hall signal amplifier allowing it to be used
1
8
GND
VCC
2
7
OUT1
HIN+
3
6
PWM
HIN-
4
5
FG
with either a Hall element or a Hall Switch.
OUT2
1
10
GND
NC
2
9
OUT1
HIN+
3
8
VCC
HB
4
7
PWM
HIN-
5
6
FG
MSOP-8 (M8 Package)
To help protect the motor coil the AM9789 includes rotor lock, over
MSOP-10 (MM Package)
current and over temperature protection which shuts down the output
drive. The device automatically re-starts when the rotor lock is
Pin 1 Mark
Pin 1 Mark
removed or the operating conditions return to normal. A Tachometer
output is provided by open-drain Frequency Generator (FG) Pin which
OUT2
1
8
GND
OUT2
1
10
GND
NC
2
9
OUT1
HIN+
3
8
VCC
PWM
allows external interface to monitor motor rotation or speed. The FG
VCC
output is the magnetic change frequency.
HIN+
3
6
PWM
HB
4
7
HIN-
4
5
FG
HIN-
5
6
2
7
OUT1
FG
The AM9789 is available in the MSOP-8, MSOP-10, U-DFN3030-8
and U-DFN3030-10 packages.
U-DFN3030-8 (DN8 Package)
Features
U-DFN3030-10 (DN Package)
Applications
BTL Output Single-phase Full-wave Linear Driver
Silent Driver
Low Supply Current (Normal Operation, Less than 4mA)
Low Standby Current (PWM=0 Duty) @ Supply Current Less
Silent Fan Motors
than 200μA
Speed Controllable by PWM Input Signal
Built-in Quick Start Function
Built-in Lock Protection and Auto Restart Function
Built-in Hall Bias Circuit
Built-in FG Output
Built-in Thermal Shutdown Circuit
Built-in Over Current Protection Circuit
Totally Lead-free & Fully RoHS Compliant (Note 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain
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