Preliminary Datasheet
Two Phase Dual-coil High Voltage Smart Fan Motor Driver
General Description
The AH9280 is a most advanced smart fan controller
and Hall IC driver
manufactured by special CMOS
process.
It is designed for 5V, 12V and 24V cooling
fan. To allow survival in a harsh environment and
lower the total system cost, the AH9280 has been
designed with many powerful functions while almost
eliminating all discrete components, such as,
capacitor, resistor, transistor, diode and PC board.
The AH9280 can operate normally in an ambient
temperature up to 125°C due to its Hall IC circuitry
and power MOSFET output that allow low power
dissipation.
When there is no motion for one second, the IC will
automatically detect the locked rotor conditions, and
enter protection mode, shutting off the motor driver
for five seconds. Then, the IC will turn on the motor
driver for one second to detect whether there is
rotation condition, if fails, the IC will shut off motor
driver for five seconds again. This sequence will be
repeated until rotation condition is detected, and the
IC enters normal operation. This feature can
effectively prevent the AH9280 from overheating and
damage due to long-time locked rotor condition.
Specially designed for driving large fans, the AH9280
is optimized for low start-up voltage.
The AH9280 is available in TO-94 package.
AH9280
Features
•
•
•
•
•
•
•
•
High-sensitivity Integrated Hall Sensor
Low Start-up Voltage
5V, 12V and 24V Operation
Peak Output Current up to 1200mA
Power-efficient CMOS and Power MOSFETs
Built-in Output Protection Clamping Diode
Locked Rotor Shutdown and Auto-restart
ESD Rating: 6000V (Human Body Model)
400V (Machine Model)
Applications
•
•
•
•
5V/12V/24V DC Brushless Motor/Fan
PC, Server, Laptop Cooling Fan
Power Supply Cooling Fan
Large/Small Sized Fan
TO-94
Figure 1. Package Type of AH9280
Mar. 2010
Rev. 1. 0
1
BCD Semiconductor Manufacturing Limited
Preliminary Datasheet
Two Phase Dual-coil High Voltage Smart Fan Motor Driver
Absolute Maximum Ratings (Note 1, T
A
=25°C)
Parameter
Supply Voltage
Peak Output Current
Continuous Output Current
Supply Current (Fault)
Power Dissipation
Thermal Resistance (Junction to Ambient)
Storage Temperature
ESD (Human Body Model)
ESD (Machine Model)
AH9280
Symbol
V
CC
I
OUT_P
I
OUT_C
I
CC
P
D
θ
JA
T
STG
ESD
ESD
Value
28
1200
600
6
600
208
-55 to 150
6000
400
Unit
V
mA
mA
mA
mW
°C/W
°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
Supply Voltage
Ambient Temperature
Symbol
V
CC
T
A
Min
2.5
-40
Max
24 (Note 2)
125
Unit
V
°C
Note 2: It is recommended to add a 680Ω resistor at VCC if the supply voltage is 24V.
Mar. 2010
Rev. 1. 0
4
BCD Semiconductor Manufacturing Limited
Preliminary Datasheet
Two Phase Dual-coil High Voltage Smart Fan Motor Driver
Electrical Characteristics
V
CC
=12V, T
A
=25°C, unless otherwise specified.
AH9280
Parameter
Supply Voltage
Supply Current
Output Current
Output Leakage Current
Saturation Voltage
Output On Time
Output Off Time
Output Zener Break-down Voltage
Symbol
V
CC
I
CC
I
OUT
I
LEAKAGE
V
SAT
T
ON
T
OFF
V
Z
Conditions
Operating
Average
Min
2.5
Typ
12
4
0.1
Max
24
(Note 2)
6
500
10
1000
Unit
V
mA
mA
µA
mV
s
s
V
I
OUT
=350mA
600
0.8
5
35
Magnetic Characteristics
V
CC
=12V, T
A
=25°C, unless otherwise specified.
Parameter
Operating Point
Releasing Point
Hysteresis
Symbol
B
OP
B
RP
B
HYS
Min
-50
Typ
20
-20
40
Max
50
Unit
Gauss
Gauss
Gauss
V
DO
(V)
High
Off-state
B
HYS
Turn Off
V
SAT
N
B
RP
0
Turn On
Low
On-state
B
OP
S
Figure 4. Magnetic Flux Density (Gauss)
Mar. 2010
Rev. 1. 0
5
BCD Semiconductor Manufacturing Limited
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