AH5798

SINGLE PHASE HALL EFFECT LATCH SMART

FAN MOTOR CONTROLLER

AH5798

Document number: DS32001 Rev. 2 - 2

2 of 11

www.diodes.com

June 2010

© Diodes Incorporated

Typical Application Circuit

V

dd

FG

O1

O2

FG

SYSTEM

POWER

V

SS

SYSTEM

POWER

10Kohm

AH5798

Dz

C1

D1

* Reverse connection of power supply may damage the device. To prevent reverse power damage, a protection (reverse blocking)

Diode D1 is needed between power supply and Vdd terminal. If a reverse power protection diode D1 is used, there

is no current return path to power supply, so it is necessary to follow measures such as below.

- Connect Dz (Zener diode) between Vdd and Vss terminal, to prevent voltage exceeding the absolute maximum rating of the device.

- Connect a capacitor C1 between Vdd and Vss terminal, to complete the current return path to power supply.

The AH5798 has an open-drain tachometer FG output that follows the magnetic change frequency. Typically, a pull-up resistor of 10k

Ω is

recommended from FG pin to the supply voltage.

Pin Descriptions

Pin Name

Description

Vdd

Power Supply Pin

Vss

Ground Pin

O1

Output Driving & Sinking Pin 1

O2

Output Driving & Sinking Pin 2

NC

No Connection

FG

Frequency Generator (Note 1)

Notes:

1. The FG is the same as the magnetic change frequency.