Product Brief
Two Phase Dual-coil High Voltage Smart Fan Motor Driver with FG/RD
Description
The AH9281/82 is a one-chip solution for driving
two-coil brushless DC motors and fans.
Based on the advanced CDMOS process, the IC
contains a Hall-effect sensor, dynamic offset
correction and powerful output drivers with
1200mA peak output current capability.
Specially designed for driving large fans, the
device is optimized for low start-up voltage.
Frequency Generator or Rotation Detection is
available. The open drain output makes easier the
connectivity with any external interface such as
hardware monitoring or Super I/O IC.
The AH9281/82 is available in TO-95 and
SOT-89-5 packages.
AH9281/82
Parametric Table
Supply Voltage (V)
Output Saturation Voltage
(V
CC
=12V, I
OUT
=350mA)
(V)
2.5 to 24
0.6
0.1
4
0.8
5
20
-20
40
FG/RD Output Low Voltage
(V
CC
=12V, I
FG
=5mA)
(V)
Supply Current (mA)
Output ON Time (S)
Output OFF Time (S)
Operating Point (Gauss)
Releasing Point (Gauss)
Hysteresis (Gauss)
Features
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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
Integrated Tachometer (AH9281) or Alarm
(AH9282) Signal Output
ESD Rating: 6000V (Human Body Model)
400V (Machine Model)
Benefits
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Minimum External Components
Low Startup Voltage
Locked Protection and Auto-restart
With FG or RD Output
Wide Operation Voltage Range
Excellent Temperature Performance
High Sensitivity for Switching Symmetry
High ESD and Power Efficient
Additional Available Materials
Applications
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5V/12V/24V DC Brushless Motor/Fan
PC, Server, Laptop Cooling Fan
Power Supply Cooling Fan
Large or Small Fans
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Samples
Preliminary Datasheet
Reliability Report
ESD Report
Mar. 2010
1
BCD Semiconductor Manufacturing Limited
BCDSEMI [ BCD SEMICONDUCTOR MANUFACTURING LIMITED ]
