Preliminary Datasheet
TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279
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 MOSFET power transistor 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.
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, 12V and 24V 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
TO-94
Figure 1. Package Type of AH9279
Apr. 2009
Rev. 1. 0 1
BCD Semiconductor Manufacturing Limited
Preliminary Datasheet
TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279
Pin Configuration
Z4 Package (TO-94)
4 3 2 1
GND DOB DO VDD
Figure 2. Pin Configuration of AH9279 (Front View)
Pin Description
Pin Name
VDD DO DOB GND
Pin Number
1 2 3 4 Power supply pin Output pin 1 Output pin 2 Ground pin
Function
Apr. 2009
Rev. 1. 0 2
BCD Semiconductor Manufacturing Limited
Preliminary Datasheet
TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279
Functional Block Diagram
VDD
1
Regulator
Lock Shutdown and Automatic Recovery
2
DO
Hall Plate
Amp
Control Logic
3
DOB
4
GND
Figure 3. Functional Block Diagram of AH9279
Ordering Information
AH9279
-
Circuit Type Package Z4: TO-94
Package
TO-94
G1: Green
Temperature Range
-20 to 125°C
Part Number
AH9279Z4-G1
Marking ID
9279Z4-G1
Packing Type
Bulk
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green.
Apr. 2009
Rev. 1. 0 3
BCD Semiconductor Manufacturing Limited
Preliminary Datasheet
TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279
Absolute Maximum Ratings (TA=25°C, Note 1)
Parameter
Supply Voltage Supply current (Fault) Output current Power dissipation Thermal Resistance (Junction to Ambient)
Symbol
VCC ICC IOUT PD
θJA
Value
28 5 500 550 227 -55 to 150 4000 400
Unit
V mA mA mW
°C/W °C V V
Storage Temperature ESD (Human Body Model) ESD (Machine Model)
TSTG ESD ESD
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
Supply Voltage Ambient Temperature
Symbol
VCC TA
Min
3.5 -20
Max
24 125
Unit
V °C
Apr. 2009
Rev. 1. 0 4
BCD Semiconductor Manufacturing Limited
Preliminary Datasheet
TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279
Electrical Characteristics
VCC =12V, TA =25°C, unless otherwise specified. Parameter
Supply Voltage Supply Current
Output Current Output Leakage Current Saturation Voltage Output ON Time Output OFF Time Thermal Resistance (Junction to Case)
Symbol
VCC ICC IOUT ILEAKAGE VSAT
tON tOFF θJC
Conditions
Operating Average
Min
3.5
Typ
Max
24 (Note 2)
Unit
V mA mA µA mV S S
3.5
5 500
VOUT=24V
IOUT =350mA
0.1 600 0.8 5 49
10 1000
°C/W
Note 2: It is recommended to add a 680Ω resistor at VDD if the supply voltage is 24V.
Magnetic Characteristics
VCC =12V, TA =25°C, unless otherwise specified. Parameter
Operating Point Releasing Point Hysteresis
Symbol
BOP BRP BHYS
Min
-50
Typ
25 -25 50
Max
50
Unit
Gauss Gauss Gauss
Apr. 2009
Rev. 1. 0 5
BCD Semiconductor Manufacturing Limited
Preliminary Datasheet
TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279
Test Circuit
VDD
S
1
AH9279
2 3 4 RL1 GND C3 DO RL2
Marking Side
DOB
N
R1 C1
R2 C2
Figure 4. Basic Test Circuit of AH9279
DO( V) VCC
12
D OB(V)
12
V CC
10
10
8
8
6
6
4
4
2
2
VSAT
0 -40 -20 0 20 40
V SAT
-40 -20
0 0 20 40
Magnetic Flux Density B(GS)
Magnetic Flux Density B(GS)
Figure 5. VDO vs. Magnetic Flux Density
Figure 6. VDOB vs. Magnetic Flux Density
Apr. 2009
Rev. 1. 0 6
BCD Semiconductor Manufacturing Limited
Preliminary Datasheet
TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279
Typical Performance Characteristics
5.0 4.5
6.0 5.5 5.0
Supply Current (mA)
Supply Current (mA)
4.0 3.5 3.0 2.5 2.0 1.5 1.0
4.5 4.0 3.5 3.0 2.5 2.0 1.5
TA=25 C
4 6 8 10 12 14 16 18 20
O
1.0 0.5 0.0 -20 0 20 40 60
o
TA=25 C VCC=12V
80 100 120
o
Supply Voltage (V)
Ambient Temperature ( C)
Figure 7. Supply Current vs. Supply Voltage
Figure 8. Supply Current vs. Ambient Temperature
100
900 800
BOP/BRP/BHYS (Gauss)
50
Saturation Voltage (mV)
700 600 500 400 300 200
0
BOP
-50
BRP BHYS
4 6 8 10 12 14 16
TA=25 C
O
VCC=12V IOUT=350mA
-20 0 20 40 60
O
18
20
80
100
120
Supply Voltage (V)
Ambient Temperature ( C)
Figure 9. BOP/BRP/BHYS vs. Supply Voltage
Figure 10. Saturation Voltage vs. Ambient Temperature
Apr. 2009
Rev. 1. 0 7
BCD Semiconductor Manufacturing Limited
Preliminary Datasheet
TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279
Typical Performance Characteristics (Continued)
1200 600
Power Dissipation (mW)
1000
500
Saturation Voltage (mV)
800
400
600
300
400
TA=25 C VCC=12V
O
200
200
100
0
100
200
300
400
500
0 -25
0
25
50
75
100
O
125
150
Output Current (mA)
Ambient Temperature ( C)
Figure 11. Saturation Voltage vs. Output Current
Figure 12. Power Dissipation vs. Ambient Temperature
40 30
BOP/BRP/BHYS (Gauss)
20 10 0 -10 -20 -30 -40 -20 0 20 40 60 80
O
BOP BRP BHYS
100
120
Ambient Temperature ( C)
Figure 13. BOP/BRP/BHYS vs Ambient Temperature
Apr. 2009
Rev. 1. 0 8
BCD Semiconductor Manufacturing Limited
Preliminary Datasheet
TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279
Typical Application
12V VDD D1
AH9279
1 2 3 4 L2 GND L1
C3
DO
DOB
C2
C1
C1=C2=C3=2.2µF typical The value of the capacitor need to be fine tuned based on coils design.
Figure 14. Typical Application of AH9279 (12V Brushless DC Fan)
24V
VDD
D1
AH9279
R1 1 2 3 4 L2 GND L1
C3
DO
DOB
C2
C1
R1=680Ω C1=C2=C3=2.2µF/50V
Figure 15. Typical Application of AH9279 (24V Brushless DC Fan)
Apr. 2009
Rev. 1. 0 9
BCD Semiconductor Manufacturing Limited
Preliminary Datasheet
TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279
Mechanical Dimensions TO-94
45° TYP
Unit: mm(inch)
0.500(0.020) 0.700(0.028) 1.520(0.059) 1.720(0.067) 0.700(0.028) 0.900(0.035) 2.000(0.079) 2.300(0.091) 1.100(0.043) 1.400(0.055)
3.780( 0.149) 4.080( 0.161)
4.980(0.196) 5.280(0.208)
0.360(0.014) 0.510(0.020)
0.380(0.015) 0.550(0.022)
3.450(0.136) 3.750(0.148)
0.360(0.014) 0.500(0.020)
14.900(0.587) 15.300(0.602)
3.710(0.146) 3.910(0.154)
1.270(0.050) TYP
Apr. 2009
Rev. 1. 0 10
BCD Semiconductor Manufacturing Limited
BCD Semiconductor Manufacturing Limited
http://www.bcdsemi.com
IMPORTANT NOTICE BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifications 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 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.
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