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AH285

HALL-EFFECT SMART FAN MOTOR CONTROLLER


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AH285 pdf
AH285
HALL-EFFECT SMART FAN MOTOR CONTROLLER
Description
Pin Assignments
The AH285 is a single-chip solution for driving two-coil
brushless direct current (BLDC) fans and motors. The device
includes a Hall-effect sensor, dynamic offset correction and
two complementary open-drain output drivers with internal
Zener diode protection.
To help protect the motor coils, the AH285 provides Rotor
Lock Protection which shuts down output drives if rotor lock is
detected. The device automatically re-starts when the rotor
lock is removed.
A Tachometer output is provided by open-drain Frequency
Generator (FG) Pin which allows external interface to monitor
motor rotation or speed. The FG output is the magnetic
change frequency.
The AH285 is available in SOT89-5L package.
(Top View)
Vdd 1
5 FG
GND 2 285
DO 3
74 DOB
SOT89-5L
Features
Applications
• Single-chip solution
• Operating Voltage: 3.8V to 20V
• Built-in Hall sensor and input amplifier
• Tachometer (FG) output
• Rotor Lock Protection (Lock detection, output shutdown
and automatic re-start)
• Built-in Zener protection for output driver
• Average output current up to 500mA
• Packaged in SOT89-5L
• Green Molding Compound
• Two-coil BLDC cooling fans
• Low to medium voltage, low power BLDC motors
Typical Application Circuit
Vdd (12V)
D2
FG
D3
D1 Rpu
C3
54
285
123
GND
Coil2
Coil1
R1 R2
C1 C2
Notes:
12V DC Brush-less Fan with FG output function
1. Typically it is recommended to us a 56 Ohm resistor for R1 and R2 and a 2.2μF E-Cap capacitor for C1, C2 and C3. These values
may need to be optimized depending on the coils used.
To help with IC protection it’s advised to add a Zener diode between Vdd and ground. The Zener diode should be chosen to help
prevent the supply voltage exceeding the maximum rating of the device.
AH285
Document number: DS31029 Rev. 8 - 2
1 of 9
www.diodes.com
June 2010
© Diodes Incorporated



No Preview Available !

AH285 pdf
AH285
HALL-EFFECT SMART FAN MOTOR CONTROLLER
Pin Descriptions
Pin Name
FG
Vdd
DO
DOB
GND
Description
Frequency Generation
Input Power
Output Pin
Output Pin
Ground
Functional Block Diagram
Vdd
Regulator
Hall
Plate
Amp.
Lock detect,
shutdown and
automatic re-start
Control Logic
DO
DOB
GND
FG
AH285
Document number: DS31029 Rev. 8 - 2
2 of 9
www.diodes.com
June 2010
© Diodes Incorporated



Part Number AH285
Description HALL-EFFECT SMART FAN MOTOR CONTROLLER
Maker Diodes Incorporated - Diodes Incorporated
Total Page 9 Pages
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