Diodes AH288 User Manual

AH288

HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR

CONTROLLER

Features

• On chip Hall sensor

• Rotor-locked shutdown

• Automatically restart

• Frequency generator (FG) output

• Built-in Zener protection for output driver

• Operating voltage: 3.8V~28V

• Output current: I

• Lead Free Package: SOT89-5L (Note 1)

• SOT89-5L: Available in “Green” Molding Compound

(No Br, Sb)

• Lead Free Finish/RoHS Compliant (Note 2)

O(AVE)

= 400mA

Typical Application Circuit

Vdd

(24V)

R

D1

pu

FG

General Description

AH288 is a monolithic fan motor controller with Hall sensor’s capability. It contains two complementary open-drain transistors as motor coil drivers, automatic lock current shutdown, and recovery protections. Additional, frequency generator (FG) output is for speed detection 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. U ntil the blocking is removed, the motor recovers and runs normally.

D2

5 4

288

Coil2

Coil1

48V

D3

132

C1

GND

* Rpu : typical 10 Kohm

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 value need to be fine tuned to optimize design for different coils and power suppliers .

=27V. Which C1and D3

Z

48V

24V DC Brush-less Fan with FG output function

AH288 Rev. 12 1 of 9 APRIL 2010 DS31040 www.diodes.com © Diodes Incorporated

Ordering Information

HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR

CONTROLLER

AH288 - Y L - 13

PackingPackage Lead Free

AH288

Y : SOT89-5L

L : Lead Free (Note 1)

13 : Tape & Reel

G : Green

Device

AH288-YL-13 Y SOT89-5L 2500/Tape & Reel -13 AH288-YG-13 Y SOT89-5L 2500/Tape & Reel -13

Notes: 1. AH288-YL-13 will be replaced by AH288-YG-13

2. EU Directive 2002/95/EC (RoHS). All applicable RoHS e xemptions 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)

Quantity Part Number Suffix

13” Tape and Reel

Pin Assignments

( Top View )

Vdd

GND

1

288

2

FG

5

DO

3

SOT89-5L

7

4

DOB

Pin Descriptions

Pin Name Pin No. Description

Vdd 1 Input power

GND 2 Ground

DO 3 Output pin

DOB 4 Output pin

FG 5 Frequency generation

AH288 Rev. 12 2 of 9 APRIL 2010 DS31040 www.diodes.com © Diodes Incorporated

Block Diagram

Vdd

2

HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR

CONTROLLER

Lock shutdown

and

Automatic recovery

AH288

Regulator

Hall

Plate

Amp.

GND

DO

Control Logic

DOB

1

FG

AH288 Rev. 12 3 of 9 APRIL 2010 DS31040 www.diodes.com © Diodes Incorporated

AH288

)

θJAθ

HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR

CONTROLLER

Absolute Maximum Ratings (TA = 25°C)

TJ

Parameter

TA

Rating Unit

400 mA

I

O(AVE

I

700 mA

O(PEAK

Tc

JC

Symbol

Vdd Supply Voltage 30 V

IO

Output Current

PD Power Dissipation 800 mW

TST Storage Temperature -55 ~ 150

TJ Maximum Junction Temperature 150

θ

Thermal Resistance Junction-to-Case (Note 5) 156

JA

°C °C

°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

AH288 Rev. 12 4 of 9 APRIL 2010 DS31040 www.diodes.com © Diodes Incorporated

AH288

HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR

CONTROLLER

Electrical Characteristics (TA = 25 °C, Vdd

= 24V, unless otherwise specified)

Symbol Parameter

Conditions

Min Typ. Max Unit

ICC Supply Current Operating - 2 4 mA

I

Out put Leakage Current V

OFF

T

LRP-ON

T

LRP-OFF

V

OUT(SAT)

R

DS(ON)

Output On Resistance IO = 200mA - 2.25 3.5 ohm

Locked Protection On 0.4 0.46 0.6 Sec Locked Protection Off 2.4 2.76 3.6 Sec

Output Saturation Voltage

= 24V - < 0.1 10 μA

OUT

I

= 200mA - 450 700

O

IO = 300mA - 680 800

VOL FG Output Vds IO = 10mA - 0.3 0.5 V

VZ Output Zener-breakdown Voltage 42 55 65 V

Truth Table

IN- IN+ CT OUT1 OUT2 FG Mode

H L L H L H Rotating

L H L L H L Rotating

- - H off off - Lockup protection activated

Magnetic Characteristics (TA = 25 °C, Vdd

= 24V, unless oth e rwise specified, Note 7)

(1mT=10 Gauss)

Symbol Characteristics Min Typ. Max Unit

mV

Bop Operate Point 10 30 60 Gauss

Brp Release Point -60 -30 -10 Gauss

Bhy Hysteresis - 60 - Gauss

Notes: 7. Magnetic characteristics are for design information, which will vary with supply voltage, operating temperature and after soldering.

AH288 Rev. 12 5 of 9 APRIL 2010 DS31040 www.diodes.com © Diodes Incorporated

Operating Characteristics

DOB DO

AH288

HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR

CONTROLLER

RP

ON

Output Voltage in Volts

24 20 16 12

8 4

OFF

OP

Vsat Vsat

OFF

RP

Output Voltage in Volts

Magnetic Flux Density in GaussMagnetic Flux Density in Gauss

24 20 16 12

OP

8 4

ON

BopBrp 0BopBrp 0

S

Marking

side

N

( SOT89-5L )

HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR

Performance Characteristics (SOT89-5L)

TA (°C)

25 50 60 70 75 80 85 90 95 100

AH288

CONTROLLER

800 640 576 512 480 448 416 384 352 320

105 110 115 120 125 130 135 140 145 150

288 256 224 192 160 128 96 64 32 0

0

-4 0

0 255075100125150

PD (mW)

TA (°C)

PD (mW)

P

D

(mW )

900 800 700 600 500 400 300 200 100

Marking Information

(1) SOT89-5L

Power Dissipation Curve

TA (°C)

( Top View )

5

288 Y W X

1 2 3

4

7

Y : Year : 0~9

: Week : A~Z : 1~26 week;

W

a~z : 27~52 week;

z represents 52 and 53 week

: Internal code

X

a~z : Lead Free

A~Z : Green

HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR

Package Information (All Dimensions in mm)

(1) Package type: SOT89-5L

AH288

CONTROLLER

Sensor Location

AH288

HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR

CONTROLLER

DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, TH E IMPLIED WARRA NTIES OF MERCHA NTABILITY AND FITNE SS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER TH E LAWS OF ANY JURISDICTION).

Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated website, harmless against all damages.

Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.

Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks.

Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:

A. Life support devices or systems are devices or systems which:

1. are intended to implant into the body, or

2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user.

B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected

to cause the failure of the life support device or to affect its safety or effectiveness.

Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further, 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.

www.diodes.com

IMPORTANT NOTICE

LIFE SUPPORT