Diodes AH9281_82 - Manual (Page 13)

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
13
Typical Application (Continued)
5
2 3 1
4
VCC GND FG/RD
DO DOB
V
CC
=5V or 12V
R
PU
4.7k
AH9281/2
GND
Coil 1
Coil 2
C1
2.2 F
FG/RD
D1
R1
47
ZD1 35V
ZD2 35V
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=47
Ω typical.
3. C1=2.2 µF typical, electrolytic capacitors are better. They should be fine tuned based on system design.
4. ZD1 and ZD2 breakdown voltage are 35V.
5. R
PU
=4.7k Ω typical.
.