Diodes AH9281_82 - Manual (Page 10)

Data Sheet
Two Phase Dual-coil High Voltage Smart Fan Motor Driver with FG/RD AH9281/82
Oct. 2011 Rev. 1. 4 BCD Semiconductor Manufacturing Limited
10
Typical Application
AH9281/2
VCC DO DOB GND
V
CC
=5V or 12V
FG/RD
C1
2.2 F
R
PU
4.7K
FG/RD
C2
2.2 F
C3
2.2 F
D1
Coil 1 Coil 2 R1
47
R2
4.7
R3
4.7
Figure 15. Typical Application 1 of AH9281/82 (TO-95, Note 2)
Note 2:
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=47
Ω typical.
3. C1=C2=C3=2.2 µF typical, electrolytic capacitors are better. They should be fine tuned based on system
design.
4. R2=R3=4.7
Ω typical. They can be cancelled according to system requirement.
5. R
PU
=4.7k Ω typical.