Diodes AH9279 User Manual

TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279

Data Sheet

General Description

The AH9279 is a most advanced fan control and
drive Hall IC manufactured by special CMOS
process. This IC consists of voltage reference, Hall
sensor, signal amplifier, wave shaping circuit, locked
rotor detector, locked rotor protection and restart
circuit, output drive circuit, etc.. To allow survival in
a harsh environment and in consideration of low cost,
the AH9279 has been designed with many functions
internally, and requires less external components.

When there is no motion for one second, the IC will
detect locked rotor conditions, enter protection mode
automatically and disable two outputs for five
seconds. Then, it will turn on drive current from one
channel for one second. If it still fails to detect fan
rotation, the AH9279 will shut off the outputs for five
seconds again. This sequence will be repeated until
rotation condition is detected and the IC enters
normal operation mode. This function prevents the
chip from overheating and damage due to long time
locked rotor.

The power dissipation decides allowable maximum
ambient temperature. Low power dissipation of
AH9279 and the output MOS
enable it to be used at ambient temperature up to
125°C on condition that the drive power is lower than
100mW or drive current is less than 200mA.

The AH9279 is available in TO-94 package.

FET power transistor

Features

• On Chip Hall Sensor

• Built-in Zener Diodes Protection for Output
Driver

• Power Efficient CMOS and Power MOSFET
Drivers Allow 400mA Without Overheating

• 5V and 12V Operation

• High Sensitivity for Switching Symmetry

• Locked Rotor Shutdown and Auto Restart

• ESD Rating: 4000V(Human Body Model)

400V(Machine Model)

Applications

• Dual-coil Brushless DC Fan

Figure 1. Package Type of AH9279

TO-94

Oct. 2011 Rev. 1. 3 BCD Semiconductor Manufacturing Limited

1

Data Sheet

TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279

Pin Configuration

Z4 Package

(TO-94)

4
3
2
1

Figure 2. Pin Configuration of AH9279 (Front View)

GND

DOB

DO

VCC

Pin Description

Pin Number Pin Name Function

1 VCC Power supply pin

2 DO Output pin 1

3 DOB Output pin 2

4 GND Ground pin

Oct. 2011 Rev. 1. 3 BCD Semiconductor Manufacturing Limited

2

Data Sheet

TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279

Functional Block Diagram

Figure 3. Functional Block Diagram of AH9279

Ordering Information

AH9279 -

Circuit Type

Package
Z4: TO-94

Package Temperature Range Part Number Marking ID Packing Type

TO-94

BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant
and green.

-20 to 125°C

AH9279Z4-G1 9279Z4-G1 Bulk

G1: Green

Oct. 2011 Rev. 1. 3 BCD Semiconductor Manufacturing Limited

3

Data Sheet

TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279

Absolute Maximum Ratings (TA=25°C, Note 1)

Parameter Symbol Value Unit

Supply Voltage

Supply current (Fault)

Output current

Power dissipation

Thermal Resistance (Junction to Ambient) θJA 227

Storage Temperature T

ESD (Human Body Model) ESD

ESD (Machine Model) ESD

V

I

I

CC

CC

OUT

P

STG

D

18 V

5 mA

500 mA

550 mW

°C/W

-55 to 150

4000

400

°C

V

V

Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to
the device. These are stress ratings only, and functional operation of the device at these or any other conditions
beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute
Maximum Ratings” for extended periods may affect device reliability.

Recommended Operating Conditions

Parameter Symbol Min Max Unit

Supply Voltage VCC 3.5 16 V

Ambient Temperature TA -20 125

°C

Oct. 2011 Rev. 1. 3 BCD Semiconductor Manufacturing Limited

4

Data Sheet

TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279

Electrical Characteristics

V

=12V, TA =25°C, unless otherwise specified.

CC

Parameter Symbol Conditions Min Typ Max Unit

Supply Voltage VCC

Supply Current ICC

Output Current

Output Leakage Current

Saturation Voltage

Output ON Time tON 0.8 S

Output OFF Time t

Output Zener Break-down
Voltage

Thermal Resistance
(Junction to Case)

I

OUT

I

LEAKAGE

V

SAT

OFF

V

Z

θ

JC

Operating 3.5 16 V

Average 3.5 5 mA

500 mA

V

=24V

OUT

I

5 S

=350mA

OUT

0.1 10

600 1000 mV

µA

35 V

49

°C/W

Magnetic Characteristics

V

=12V, TA =25°C, unless otherwise specified.

CC

Parameter Symbol Min Typ Max Unit

Operating Point BOP 25 50 Gauss

Releasing Point BRP -50 -25 Gauss

Hysteresis B

50 Gauss

HYS

Oct. 2011 Rev. 1. 3 BCD Semiconductor Manufacturing Limited

5

Data Sheet

TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279

Test Circuit

S

Marking Side

N

Figure 4. Basic Test Circuit of AH9279

V

CC

DO( V)

12

10

8

6

4

DOB(V)

12

10

8

6

4

V

CC

2

0

-40 -20 0 20 4 0

Magnetic Flux Density B(GS)

V

SAT

V

SAT

-40 -20 0 20 40

Magnetic Flux Density B(GS)

2

0

Figure 5. VDO vs. Magnetic Flux Density Figure 6. V

vs. Magnetic Flux Density

DOB

Oct. 2011 Rev. 1. 3 BCD Semiconductor Manufacturing Limited

6

Data Sheet

TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279

Typical Performance Characteristics

5.0

4.5

4.0

3.5

3.0

2.5

Supply Current (mA)

2.0

1.5

1.0

TA=25OC

4 6 8 1012141618

Supply Voltage (V)

Figure 7. Supply Current vs. Supply Voltage Figure 8. Supply Current vs. Ambient Temperature

6.0

5.5

5.0

4.5

4.0

3.5

3.0

2.5

2.0

Supply Current (mA)

1.5

1.0

0.5

0.0

-20 0 20 40 60 80 100 120

Ambient Temperature (oC)

TA=25oC
V

=12V

CC

100

900

50

(Gauss)

HYS

/B

0

RP

/B

OP

B

-50

B

OP

B

RP

B

HYS

4 6 8 10 12 14 16 18

TA=25OC

Supply Voltage (V)

800

700

600

500

400

Saturation Voltage (mV)

300

200

-20 0 20 40 60 80 100 120

Ambient Temperature (OC)

VCC=12V
I

=350mA

OUT

Figure 9. B

OP/BRP/BHYS

vs. Supply Voltage Figure 10. Saturation Voltage

vs. Ambient Temperature

Oct. 2011 Rev. 1. 3 BCD Semiconductor Manufacturing Limited

7

Data Sheet

TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279

Typical Performance Characteristics (Continued)

1200

1000

800

600

400

Saturation Voltage (mV)

200

V

CC

TA=25OC

=12V

0

100 200 300 400 500

Output Current (mA)

600

500

400

300

200

Power Dissipation (mW)

100

0

-25 0 25 50 75 100 125 150

Ambient Temperature (OC)

Figure 11. Saturation Voltage vs. Output Current Figure 12. Power Dissipation vs. Ambient Temperature

40

30

20

10

(Gauss)

0

HYS

/B

RP

-10

/B

OP

-20

B

-30

-40

-20 0 20 40 60 80 100 120

Ambient Temperature (OC)

B

OP

B

RP

B

HYS

Figure 13. B

OP/BRP/BHYS

vs Ambient Temperature

Oct. 2011 Rev. 1. 3 BCD Semiconductor Manufacturing Limited

8

Data Sheet

TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279

T ypical Application

VCC=5V or 12V

D1

F

Coil 1 Coil 2

R2

4.7

2.2

C2

F

2.2

C3

F

VCC

AH9279

DO

DOB

GND

R1

4.7
C1

2.2

Figure 14. Typical Application 1 of AH9279 (Note 2)

Note 2:

1. D1 is an ordinary diode used to filter the noise from VCC and protect IC if VCC and GND are plugged
reversed.

2. C1=C2=C3=2.2µF typical, electrolytic capacitors are better. They should be fine tuned based on system
design.

3. R1=R2=4.7Ω typical. They can be cancelled according to system requirement.

Oct. 2011 Rev. 1. 3 BCD Semiconductor Manufacturing Limited

9

Data Sheet

TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279

T ypical Application (Continued)

VCC=5V or 12V

D1

Coil 1 Coil 2

ZD2

35V

2.2

C1

F

VCC

AH9279

DOB

DO

GND

ZD1
35V

Figure 15. Typical Application 2 of AH9279 (Note 3)

Note 3:

1. D1 is an ordinary diode used to filter the noise from VCC and protect IC if VCC and GND are plugged
reversed.

2. C1=2.2µF typical, electrolytic capacitors are better. They should be fine tuned based on system design.

3. ZD1 and ZD2 breakdown voltage are 35V.

Oct. 2011 Rev. 1. 3 BCD Semiconductor Manufacturing Limited

10

Data Sheet

TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279

Mechanical Dimensions

TO-94 Unit: mm(inch)

Oct. 2011 Rev. 1. 3 BCD Semiconductor Manufacturing Limited

11

BCD Semiconductor Manufacturing Limited

IMPORTANT NOTICE

IMPORTANT NOTICE

BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifi-

BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifi-

cations herein. BCD Semiconductor Manufacturing Limited does not assume any responsibility for use of any its products for any

cations herein. BCD Semiconductor Manufacturing Limited does not assume any responsibility for use of any its products for any

particular purpose, nor does BCD Semiconductor Manufacturing Limited assume any liability arising out of the application or use

particular purpose, nor does BCD Semiconductor Manufacturing Limited assume any liability arising out of the application or use

of any its products or circuits. BCD Semiconductor Manufacturing Limited does not convey any license under its patent rights or

of any its products or circuits. BCD Semiconductor Manufacturing Limited does not convey any license under its patent rights or

other rights nor the rights of others.

other rights nor the rights of others.

http://www.bcdsemi.com

MAIN SITE

MAIN SITE

- Headquarters

BCD Semiconductor Manufacturing Limited

BCD Semiconductor Manufactur ing Limited

- Wafer Fab

No. 1600, Zi Xing Road, Shanghai ZiZhu Science-based Industrial Park, 200241, China

Shanghai SIM-BCD Semiconductor Manufacturing Limited

Tel: [phone], Fax: [phone]

800, Yi Shan Road, Shanghai 200233, China
Tel: [phone], Fax: [phone]

REGIONAL SALES OFFICE

Shenzhen Office

REGIONAL SALES OFFICE

Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd., Shenzhen Office

Shenzhen Office

Unit A Room 1203, Skyworth Bldg., Gaoxin Ave.1.S., Nanshan District, Shenzhen,

Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd. Shenzhen Office

China

Advanced Analog Circuits (Shanghai) Corporation Shenzhen Office

Tel: [phone]

Room E, 5F, Noble Center, No.1006, 3rd Fuzhong Road, Futian District, Shenzhen 518026, China

Fax: [phone]

Tel: [phone]
Fax: [phone]

- Wafer Fab

BCD Semiconductor Manufacturing Limited

Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd.

- IC Design Group

800 Yi Shan Road, Shanghai 200233, China

Advanced Analog Circuits (Shanghai) Corporation

Tel: [phone], Fax: [phone]

8F, Zone B, 900, Yi Shan Road, Shanghai 200233, China
Tel: [phone], Fax: [phone]

Taiwan Office
BCD Semiconductor (Taiwan) Company Limited

Taiwan Office

4F, 298-1, Rui Guang Road, Nei-Hu District, Taipei,

BCD Semiconductor (Taiwan) Company Limited

Tai wan

4F, 298-1, Rui Guang Road, Nei-Hu District, Taipei,

Tel: [phone]

Taiwan

Fax: [phone]

Tel: [phone]
Fax: [phone]

USA Office
BCD Semiconductor Corp.

USA Office

30920 Huntwood Ave. Hayward,

BCD Semiconductor Corporation

CA 94544, USA

30920 Huntwood Ave. Hayward,

Tel : [phone]

CA 94544, U.S.A

Fax: [phone]

Tel : [phone]
Fax: [phone]