Data Sheet
Single Phase Low Noise Smart Motor Driver |
AH9479/80/81 |
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General Description
The AH9479/80/81 is a single chip solution for driving single coil brushless DC motors. It combines a motor driver with a high sensitivity Hall sensor, which simplifies the PCB design and makes the fabrication of small-size motors possible.
The AH9480 has an open-drain tachometer output FG that follows the Hall sensor latching output. The AH9481 has an open-drain rotation detection output RD that is active low when the motor is spinning and goes high when blocked.
When there is no motion about 0.4 second, the IC will automatically detect the locked rotor conditions, and enter protection mode, shutting off the motor driver for 4 seconds. Then, the IC will turn on the motor driver for 0.4 second to detect whether there is rotation condition, if fails, the IC will shut off motor driver for four seconds again. This sequence will be repeated until rotation condition is detected, and the IC enters normal operation. This feature can effectively prevent the IC from overheating and damage due to long-time locked rotor condition. “Soft-switch” is used to reduce the vibration and acoustic noise. Thermal-shutdown protection ensures that the motor driver operates under specified temperature ranges.
The AH9479 is packaged in TO-94, and the AH9480/81 is packaged in TO-95 and MSOP-8.
Features
•Full Bridge Driver
•High Sensitivity Integrated Hall Sensor
•Soft-switching for Low Noise
•Low Supply Voltage: 2.5V
•Locked Rotor Protection and Auto-restart
•Thermal Protection
•Output Over-current Protection
•Short Circuit Protection
•Tachometer Output Signal (AH9480)
•Alarm Output Signal (AH9481)
Applications
•5V/12V Low Noise BLDC Cooling Fans
•Low Voltage / Low Power BLDC Motors
•Notebook DC Fans / Blowers
•Automotive Low Noise Climate Control Fans
•Micro-motors
TO-94 |
TO-95 |
MSOP-8 |
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Figure 1. Package Types of AH9479/80/81
Mar. 2012 Rev. 1. 1 |
BCD Semiconductor Manufacturing Limited |
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Data Sheet |
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Single Phase Low Noise Smart Motor Driver |
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AH9479/80/81 |
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Pin Configuration |
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Z4 Package |
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Z5 Package |
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(TO-94) |
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(TO-95) |
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GND |
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GND |
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5 |
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4 |
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OUT2 |
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OUT2 |
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4 |
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3 |
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OUT1 |
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3 |
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OUT1 |
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VCC |
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2 |
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2 |
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FG/RD |
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VCC |
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1 |
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1 |
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(For AH9479) |
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(For AH9480/81) |
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M8 Package |
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(MSOP-8) |
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NC |
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NC |
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1 |
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8 |
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FG/RD |
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VCC |
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2 |
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7 |
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GND |
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OUT2 |
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3 |
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6 |
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OUT1 |
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GND |
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4 |
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5 |
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(For AH9480/81)
Figure 2. Pin Configuration of AH9479/80/81
Pin Description
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Pin Number |
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Function |
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Name |
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TO-94 |
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TO-95 |
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MSOP-8 |
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1 |
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FG/RD |
Frequency generator (rotation detection) open drain |
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output |
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1 |
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7 |
VCC |
Power supply pin |
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2 |
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3 |
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4 |
OUT1 |
Output pin 1 |
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3 |
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4 |
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6 |
OUT2 |
Output pin 2 |
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4 |
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5 |
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3, 5 |
GND |
Ground pin |
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1, 8 |
NC |
No connection |
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Mar. 2012 |
Rev. 1. 1 |
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BCD Semiconductor Manufacturing Limited |
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2 |
Data Sheet
Single Phase Low Noise Smart Motor Driver |
AH9479/80/81 |
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Functional Block Diagram
A (B) {C}
A for TO-94
B for TO-95
C for MSOP-8
Figure 3. Functional Block Diagram of AH9479/80/81
Mar. 2012 Rev. 1. 1 |
BCD Semiconductor Manufacturing Limited |
3
Data Sheet
Single Phase Low Noise Smart Motor Driver |
AH9479/80/81 |
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Ordering Information
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AH94 |
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Circuit Type |
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G1: Green |
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79: AH9479 |
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80: AH9480 |
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TR: Tape & Reel |
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81 :AH9481 |
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Blank: Bulk |
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Package |
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Z4: TO-94 |
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Z5: TO-95 |
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M8 : MSOP-8 |
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Package |
Temperature |
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Output |
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Part Number |
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Marking ID |
Packing Type |
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Range |
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Signal |
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TO-94 |
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AH9479Z4-G1 |
9479Z4-G1 |
Bulk |
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TO-95 |
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FG |
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AH9480Z5-G1 |
9480Z5-G1 |
Bulk |
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-40 to 85°C |
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RD |
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AH9481Z5-G1 |
9481Z5-G1 |
Bulk |
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MSOP-8 |
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FG |
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AH9480M8TR-G1 |
9480M8-G1 |
Tape & Reel |
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RD |
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AH9481M8TR-G1 |
9481M8-G1 |
Tape & Reel |
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BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green.
Mar. 2012 Rev. 1. 1 |
BCD Semiconductor Manufacturing Limited |
4
Data Sheet
Single Phase Low Noise Smart Motor Driver |
AH9479/80/81 |
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Absolute Maximum Ratings (Note 1)
Parameter |
Symbol |
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Supply Voltage |
VCC |
18 |
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V |
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Peak Output Current |
IOUT_P |
500 |
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mA |
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Continuous Output Current |
IOUT_C |
300 |
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mA |
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FG/RD Pull-up Voltage |
VFG/VRD |
18 |
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V |
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FG/RD Output Current |
IFG/IRD |
10 |
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mA |
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TO-94 |
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550 |
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Power Dissipation |
PD |
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mW |
TO-95 |
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600 |
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MSOP-8 |
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585 |
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Operating Ambient Temperature |
TA |
-40 to 85 |
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ºC |
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Storage Temperature |
TSTG |
-55 to 150 |
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ºC |
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TO-94 |
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227 |
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Thermal Resistance |
θJA |
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ºC/W |
TO-95 |
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208 |
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MSOP-8 |
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214 |
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ESD (Human Body Model) |
ESD |
6000 |
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V |
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ESD (Machine Model) |
ESD |
200 |
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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 |
2.5 |
16 |
V |
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Operating Ambient Temperature |
TA |
-40 |
85 |
ºC |
Mar. 2012 Rev. 1. 1 |
BCD Semiconductor Manufacturing Limited |
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