AH284-PG-B Diodes Inc, AH284-PG-B Datasheet

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AH284-PG-B

Manufacturer Part Number
AH284-PG-B
Description
Board Mount Hall Effect / Magnetic Sensors HALL IC SMART DC FAN PRE DRVR 3.8-20V 500
Manufacturer
Diodes Inc
Datasheet

Specifications of AH284-PG-B

Lead Free Status / Rohs Status
Lead free / RoHS Compliant
The AH284 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 AH284 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.
The AH284 is available in SIP4 and SOT89-5L packages.
Features
Description
Typical Application Circuit
Notes:
AH284
Document number: DS31051 Rev. 11 - 2
Single-chip solution
Operating Voltage: 3.8V to 20V
Built-in Hall sensor and input amplifier
Rotor Lock Protection (Lock detection, output shutdown
and automatic re-start)
Built-in Zener protection for output driver
Average output current up to 500mA
Packages: SIP-4L and 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
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.
12V
D3
(Note 1)
V
dd
D1
C3
1
D2
DO
HALL-EFFECT SMART FAN MOTOR CONTROLLER
2
www.diodes.com
284
3
1 of 10
4
Pin Assignments
Applications
GND
(Top View)
1 2
Two-coil BLDC cooling fans
Low to medium voltage, low power BLDC motors
SIP-4L
DOB
284
3
4
1 : Vdd
2 : DO
3 : DOB
4 : GND
R1
C1
L2
GND
Vdd
DO
C2
1
2
3
R2
L1
(Top View)
SOT89-5L
284
© Diodes Incorporated
AH284
June 2010
7 4
5
DOB
NC

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AH284-PG-B Summary of contents

Page 1

... 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 AH284 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 ...

Page 2

... Output Pin GND Ground NC Not Connected Functional Block Diagram Vdd Regulator Hall Plate Amp. AH284 Document number: DS31051 Rev HALL-EFFECT SMART FAN MOTOR CONTROLLER Lock detect, shutdown and automatic re-start Control Logic GND www.diodes.com AH284 DO DOB June 2010 © Diodes Incorporated ...

Page 3

... HALL-EFFECT SMART FAN MOTOR CONTROLLER (T = 25°C) A Characteristics SIP- (AVE) SOT89- (PEAK) SIP-4L SOT89-5L SIP-4L SOT89- θ JA θ JC Conditions Operating Operating www.diodes.com AH284 Rating Unit 24 V 500 mA 500 mA 700 mA 550 mW 800 mW °C -55 ~ 150 °C 150 °C/W 227 °C/W 156 Tc will almost be the same as θ ...

Page 4

... Operating V = 24V OUT I = 300mA 500mA 300mA O OUT1 OUT2 off off = 25 °C, Vdd = 12V, unless otherwise specified, Note 3) A Min 10 - www.diodes.com AH284 Min Typ. Max Unit - 2.0 4.0 mA μA - < 0.1 10 0.4 0.5 0.6 Sec 2.4 3 3.6 Sec - 375 500 mV - 625 900 - 1.25 1 ...

Page 5

... ON Brp 0 Bop Magnetic Flux Density in Gauss ( SIP-4L ) AH284 Document number: DS31051 Rev HALL-EFFECT SMART FAN MOTOR CONTROLLER OFF OFF SAT SAT S S Marking side SOT89- www.diodes.com AH284 Brp 0 Bop Magnetic Flux Density in Gauss Marking side June 2010 © Diodes Incorporated ...

Page 6

... Pow er D iss ipation Curv 576 512 480 448 115 120 125 130 224 192 160 128 Power Dissipation Curve www.diodes.com AH284 100 286 264 242 220 130 135 140 150 (° 100 416 384 352 320 ...

Page 7

... Ordering Information Package P : SIP- SOT89-5L Package Packaging Device Code (Note 5, 6) AH284-PG-B P SIP-4L AH284-YG-13 Y SOT89-5L Notes Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html . 5. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www ...

Page 8

... Package Outline Dimensions (1) Package type: SIP-4L 0.7 mm Active Area Depth Package Dimension AH284 Document number: DS31051 Rev HALL-EFFECT SMART FAN MOTOR CONTROLLER (All Dimensions in mm) Marking side 1.95 士 0.1mm 1.1 士 0.1mm www.diodes.com AH284 Sensor Location June 2010 © Diodes Incorporated ...

Page 9

... Package Outline Dimensions (2) Package type: SOT89-5L Sensor Location AH284 Document number: DS31051 Rev HALL-EFFECT SMART FAN MOTOR CONTROLLER (Continued www.diodes.com AH284 June 2010 © Diodes Incorporated ...

Page 10

... Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems. Copyright © 2010, Diodes Incorporated www.diodes.com AH284 Document number: DS31051 Rev HALL-EFFECT SMART FAN MOTOR CONTROLLER IMPORTANT NOTICE LIFE SUPPORT www.diodes.com AH284 June 2010 © Diodes Incorporated ...

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