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AH293

LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR

CONTROLLER

AH293

Document number: DS31048 Rev. 6 - 2

1 of 8

www.diodes.com

June 2010

Description

AH293 is a monolithic fan motor controller with Hall sensor’s

capability. It contains two complementary open-collector

transistors for Motor’s coil driving, automatic lock current

shutdown, and recovery protections. Also, rotor-state

detection (RD) output is for speed detection.

Rotor-lock shutdown detection circuit turns off the output

driver when the rotor is blocked to avoid coil overheat. Then,

the automatic recovery circuit will restart the motor. These

protected actions are repeated and periodic during the

blocked period. Until the blocking is removed, the motor

recovers and runs normally.

The AH293 is available in SOT89-5L package.

Features

• On Chip Hall Sensor

• Rotor-Locked Shutdown

• Automatically Restart

• Rotor-State Detection (RD) Output

• Built-in Zener Protection for Output Driver

• Operating Voltage: 1.8V~5.75 V

• Output Current: I

O(AVE)

= 400 mA

• Packaged in SOT89-5L

• Green Molding Compound

Pin Assignments

3 7

DOBDO

GND

Vdd

SOT89-5L

293

(Top View)

Applications

• Two-coil BLDC cooling fans

• Low to medium voltage, low power BLDC motors

Typical Application Circuit (Note 1)

293

(1.8V/5.75V)

Coil2 Coil1

(alarm)

GND

R1 R2

C1 C2

Notes: 1. R1, R2: typical 56 Ohm

C1, C2, C3: typical 2.2µF

The R, C value need to be fine tuned based

on coils design.

1.8V/5.75V DC Brush-Less Fan with RD Output Function

Summary of content (8 pages)

PAGE 1
AH293 LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER Description Pin Assignments AH293 is a monolithic fan motor controller with Hall sensor’s capability. It contains two complementary open-collector transistors for Motor’s coil driving, automatic lock current shutdown, and recovery protections. Also, rotor-state detection (RD) output is for speed detection. (Top View) Rotor-lock shutdown detection circuit turns off the output driver when the rotor is blocked to avoid coil overheat.
PAGE 2
AH293 LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER Pin Descriptions Pin Name RD Vdd DO DOB GND Description Rotor-State Detection Input Power Output Pin Output Pin Ground Functional Block Diagram Vdd Lock detect, shutdown and automatic re-start Regulator DO Hall Plate Control Logic Amp. DOB GND AH293 Document number: DS31048 Rev. 6 - 2 2 of 8 www.diodes.
PAGE 3
AH293 LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER Absolute Maximum Ratings (TA = 25°C) Symbol Vdd IO(AVE) IO(PEAK) PD TST TJ Characteristics Operating Supply Voltage Output Current Output Current Power Dissipation Storage Temperature Maximum Junction Temperature Rating Unit 8 400 700 800 -55 ~ 150 150 V mA mA mW °C °C Recommended Operating Conditions Symbol Vdd TA Notes: Characteristic Supply Voltage (Note 2) Operating Ambient Temperature Conditions Min Max Unit Operating Operating 1.
PAGE 4
AH293 LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER Magnetic Characteristics (TA = 25 °C, Vdd = 5V, unless otherwise specified, Note 4) (1mT = 10 Gauss) Symbol Characteristics Bop Brp Bhy Notes: Operation Point Release Point Hysteresis Min Typ. Max Unit -60 - 30 -30 60 60 - Gauss Gauss Gauss 4. The magnetic characteristics may vary with supply voltage, operating temperature and after soldering.
PAGE 5
AH293 LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER Performance Characteristics 25 800 105 288 TA (°C) PD (mW) TA (°C) PD (mW) 50 640 110 256 P D (mW ) 60 576 115 224 70 512 120 192 75 480 125 160 80 448 130 128 85 416 135 96 90 384 140 64 95 352 145 32 100 320 150 0 Power Dissipation Curve 900 800 700 600 500 400 300 200 100 0 -4 00 25 50 75 10 0 125 1 50 T A (°C) AH293 Document number: DS31048 Rev. 6 - 2 5 of 8 www.diodes.
PAGE 6
AH293 LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER Ordering Information AH 293 - Y G - 13 Device AH293-YG-13 Notes: Package Green Packing Y : SOT89-5L G : Green (Note 5) 13 : Tape & Reel Package Code Packaging (Note 6, 7) Y SOT89-5L Bulk Part Number Quantity Suffix NA NA 13” Tape and Reel Part Number Quantity Suffix 2500/Tape & Reel -13 5. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html. 6.
PAGE 7
AH293 LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER Package Outline Dimensions (All Dimensions in mm) Sensor Location AH293 Document number: DS31048 Rev. 6 - 2 7 of 8 www.diodes.
PAGE 8
AH293 LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER IMPORTANT NOTICE 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 JURISDICTION).