Diodes AH9281_82 - Manual (Page 12)

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
12
Typical Application (Continued)
Figure 17. Typical Application 3 of AH9281/82 (SOT-89-5, Note 4)
Note 4:
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.