AH285_10 DIODES [Diodes Incorporated], AH285_10 Datasheet

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AH285_10

Manufacturer Part Number
AH285_10
Description
HALL-EFFECT SMART FAN MOTOR CONTROLLER
Manufacturer
DIODES [Diodes Incorporated]
Datasheet
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.
Features
Notes:
Description
Typical Application Circuit
AH285
Document number: DS31029 Rev. 8 - 2
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
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
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.
may need to be optimized depending on the coils used.
FG
Vdd (12V)
D3
12V DC Brush-less Fan with FG output function
D1
C3
R
pu
HALL-EFFECT SMART FAN MOTOR CONTROLLER
www.diodes.com
1 of 9
5
1
Pin Assignments
Applications
285
GND
Two-coil BLDC cooling fans
Low to medium voltage, low power BLDC motors
D2
2
4
3
GND
Vdd
DO
R1
C1
1
2
3
Coil2
(Top View)
SOT89-5L
285
Coil1
R2
C2
7 4
5
DOB
FG
© Diodes Incorporated
AH285
June 2010

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AH285_10 Summary of contents

Page 1

Description 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 ...

Page 2

Pin Descriptions Pin Name Description FG Frequency Generation Vdd Input Power DO Output Pin DOB Output Pin GND Ground Functional Block Diagram Vdd Regulator Hall Plate Amp. AH285 Document number: DS31029 Rev HALL-EFFECT SMART FAN MOTOR CONTROLLER ...

Page 3

Absolute Maximum Ratings Symbol Vdd Supply Voltage I Output Current O P Power Dissipation D T Storage Temperature ST T Maximum Junction Temperature J θ Thermal Resistance Junction to Case (Note θ should be confirmed with heat ...

Page 4

Electrical Characteristics (T Symbol Characteristics Idd Supply Current I Output Leakage Current OFF T Rotor Lock Protection On Time RLP-ON T Rotor Lock Protection Off Time RLP-OFF V Output Saturation Voltage OUT(SAT) R Output On Resistance DS(ON Output ...

Page 5

Operating Characteristics DOB Brp 0 Magnetic Flux Density in Gauss AH285 Document number: DS31029 Rev HALL-EFFECT SMART FAN MOTOR CONTROLLER OFF OFF OP RP Vsat Vsat Bop Magnetic Flux ...

Page 6

Performance Characteristics (°C) A 800 640 P (mW) D 105 110 T (°C) A 288 256 P (mW ( ...

Page 7

... Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf. 6. Reverse taping as shown on Diodes Inc. Surface Mount (SMD) Packaging document AP02007, which can be found on our website http://www.diodes.com/datasheets/ap02007.pdf. Marking Information 5 1 AH285 Document number: DS31029 Rev ...

Page 8

Package Outline Dimensions Sensor Location AH285 Document number: DS31029 Rev HALL-EFFECT SMART FAN MOTOR CONTROLLER (All Dimensions in mm www.diodes.com AH285 June 2010 © Diodes Incorporated ...

Page 9

DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY ...

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