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

FG/RD

C1

2.2 F

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.