Diodes AH287 User Manual

AH287

HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR

CONTROLLER

Features

• On Chip Hall Sensor

• Rotor-Locked Shutdown

• Automatically Restart

• Built-in Zener Protection for Output Driver

• Operating Voltage: 3.8V~28V

• Output Current: I

• Lead Free Packages: SIP-4L and SOT89-5L (Note 1)

• SIP-4L and SOT89-5L: Available in “Green” Molding

Compound (No Br, Sb)

• Lead Free Finish/ RoHS Compliant (Note 2)

O(AVE)

= 400mA

Typical Application Circuit

24V

D1

D2

287

12 34

General Description

AH287 is a monolithic fan motor controller with Hall sensor’s capability. It contains two complementary open-drain drivers for motor’s coil driving, automatic lock shutdown and restart function relatively.

Rotor-lock shutdow n detection circuit turns off the out put 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.

L2 L1

GND

DOB

D3

C1

48V

DO

48V

Note: The optional Capacitor C1 and Diode D3 are for power stabilization. C1 is recommended to be E -Cap., luF/25V; D3 is recommended to be Zener Diode , V design for different coils and power suppliers .

=27V. Which C1and D3 value need to be fine tuned to optimize

Z

24V Brush-Less DC Fan

AH287 Rev. 10 1 of 11 APRIL 2010 DS31042 www.diodes.com © Diodes Incorporated

Ordering Information

HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR

CONTROLLER

AH 287 - X X - X

AH287

Package

P : SIP-4L Y : SOT89-5L 13 : Tape & Reel

Device

AH287-PL-B P SIP-4L 1000 -B NA NA AH287-PG-B P SIP-4L 1000 -B NA NA AH287-YL-13 Y SOT89-5L NA NA 2500/Tape & Reel -13 AH287-YG-13 Y SOT89-5L NA NA 2500/Tape & Reel -13

Notes: 1. AH287-YL-13 will be replaced by AH287-YG-13

2. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html.

3. 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.

4. 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.

Package

Code

Packaging

(Note 3)

Lead Free

L : Lead Free (Note 1)

G : Green

Bulk 13” Tape and Reel

Quantity

Part Number

Suffix

Packing

B : Bulk

Quantity

Part Number

Suffix

Pin Assignment

( Top View )

287

1 : Vdd

2 : DO

3 : DOB 4 : GND

12 43

SIP-4L

AH287 Rev. 10 2 of 11 APRIL 2010 DS31042 www.diodes.com © Diodes Incorporated

Vdd

GND

1

2

287

3 7

SOT89-5L

NC

5

DOBDO

4

Pin Descriptions

Pin Name Description

Vdd Input Power

DO Output Pin DOB Output Pin GND Ground

NC Not Connected

Block Diagram

Vdd

HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR

CONTROLLER

AH287

Lock Shutdown

Automatic Recovery

Regulator

and

DO

Hall

Plate

Amp.

Control Logic

DOB

GND

AH287

)

θ

HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR

CONTROLLER

Absolute Maximum Ratings (T

= 25°C)

A

Symbol Characteristics Rating Unit

Vdd Supply Voltage 30 V

SIP-4L 400 mA

I

IO Output Current

PD Power Dissipation

O(AVE)

I

700 mA

O(PEAK

SOT89-5L 400 mA

SIP-4L 550 mW SOT89-5L 800 mW

TST Storage Temperature -55 ~ 150

TJ Maximum Junction Temperature 150

θ

JA

Thermal Resistance Junct ion-to-Case (Note 5)

SIP-4L 227

SOT89-5L 156

TA

TJ

JA

JC

Tc

°C

°C °C/W °C/W

Notes: 5. θJA should be confirmed with what heat sink thermal resistance. If no heat sink contacting, θ

is almost the same as θ

JA

JC.

.

Recommended Operating Conditions

Symbol Characteristic Conditions Min Max Unit

Vdd Supply Voltage (Note 6) Operating 3.8 28 V

TA Operating Ambient Temperature Operating -40 100

Notes: 6. Please watch out the current limit issue when the operation voltage is over 26.4V, because of the different efficiency in the coil.

°C