AH286 Просмотр технического описания (PDF) - Diodes Incorporated.
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AH286 Datasheet PDF : 9 Pages
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AH286
HALL-EFFECT SMART FAN MOTOR CONTROLLER
Description
Pin Assignments
The AH286 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 AH286 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 Rotor-lock Detect (RD) output flag allows
external monitoring of any motor locks.
The AH286 is available in SOT89-5L package.
(Top View)
Vdd 1
5 RD
GND 2 286
DO 3
74 DOB
SOT89-5L
Features
Applications
• Single-chip solution
• Operating Voltage: 3.8V to 20V
• Built-in Hall sensor and input amplifier
• Rotor-lock Detect (RD) flag
• 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
RD
D3
D1 Rpu
C3
5
4
286
123
Coil2
Coil1
R1
R2
GND
C1
C2
12V DC Brush-Less Fan with RD Output Function
Notes:
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.
AH286
Document number: DS31030 Rev. 12 - 2
1 of 9
www.diodes.com
June 2010
© Diodes Incorporated
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