Data sheet, Typical application (continued) – Diodes AH9281_82 User Manual
Page 13
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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.
.
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