Data Sheet
Two Phase Dual-coil High Voltage Smart Fan Motor Driver with FG/RD AH9281/82
Typical Application (Continued)
Coil 1
Coil 2
ZD1 35V
ZD2 35V
5
4
DOB
DO
AH9281/2
VCC
FG/RD
GND
1
2
3
GND
R1
47
RPU
4.7k
VCC=5V or 12V
D1
FG/RD
C1
2.2 F
Figure 18. Typical Application 4 of AH9281/82 (SOT-89-5, Note 5)
Note 5:
1. D1 is an ordinary diode used to filter the noise from VCC and protect IC if VCC and GND are plugged
reversed.
2. R1=47Ω typical.
3. C1=2.2µF typical, electrolytic capacitors are better. They should be fine tuned based on system design.
4. ZD1 and ZD2 breakdown voltage are 35V.
5. RPU=4.7kΩ typical.
.
Oct. 2011 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
13