AH5792

SINGLE PHASE HALL EFFECT LATCH SMART

FAN MOTOR CONTROLLER

AH5792

Document number: DS314641 Rev. 6 - 2

3 of 10

www.diodes.com

July 2010

© Diodes Incorporated

Functional Block Diagram

Frequency

Generator

Lock

Detector

Full Bridge

Driver

Hall

Sensor

AMP

V

dd

FG

O1

O2

Power

V

SS

Logic

Block

FG

Out 2

Out 1

Ton

Toff

“Re-start spinning”

motor locked cleared

motor locked detected

Mechanical lock

Magentic

S

N

Normal spinning

Notes:

3. In “Normal spinning, the FG shall change its state at each rising edge of OUT2. In “Mechanical lock”, the FG state is kept as the

same as the moment of motor locked detected.

4. When magnetic is locked as “S” pole, then out1 is kept on “L”, out2 is a clock with Ton/Toff ratio. When magnetic is locked at

“N” pole, then out 2 is kept on “L”, out 1 is a clock with Ton/Toff ratio.

5. When “Re-start spinning” occurs, the motor shall ramp up to the “Normal Spinning” speed from zero. It depends on the motor

characteristics.