AH2984

TWO PHASE HALL-EFFECT SMART FAN MOTOR

CONTROLLER

AH2984

Document number: DS31698 Rev. 3 - 2

2 of 11

www.diodes.com

May 2010

© Diodes Incorporated

(1) For SIP-4L

Vdd

GND

12V

L1

L2

AH2984

12

3

4

D2

C

D1

Vdd DO DOB GND

12V Brushless DC Fan

(2) For SOT89-5L

AH2984

13

2

Vdd (12V)

L1

L2

D2

5

4

GND

C

D1

NC

DOB

Vdd

DO

GND

GND

12V Brushless DC Fan

Notes: 1. D1 (Zener Diode) and Capacitor C are for power stabilization. Recommended value of C is 1uF/ 50V (E-Cap).

Diode D2 is optional and helps to protect the device and fan coils from reverse power conditions. The AH2984 also includes an

internal reverse blocking diode at Vdd pin.

Pin Descriptions

Pin Name

SIP-4L

SOT89-5L

Description

Vdd

1

1

Input Power

DO

2

3

Output Pin

DOB

3

4

Output Pin

GND

4

2

Ground

NC

-

5

No Connection