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AH5798

SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER

Diodes Incorporated. 

Functional Block Diagram

AH5798

SINGLE PHASE HALL EFFECT LATCH SMART

FAN MOTOR CONTROLLER

Vdd

Power

FG

Frequency

Generator

Hall

Sensor

AMP

Vss

O1

Control Soft Switching Full Bridge

Logic

Control

Driver

O2

Lock detect,

Shoutdown and

Automatic re-start

Operating

S

Magentic

N

O2

O1

FG

Normal spinning

Ton Toff

Mechanical lock

motor locked detected

“Re-start spinning”

motor locked cleared

Notes:

2. In “Normal spinning”, the FG changes its state at each rising edge of O1.

3. When the motor locks with South pole at the Hall element, O2 is kept on “L” and O1 is a clock with Ton/Toff ratio. When motor

locks with North pole at the Hall element, O1 is kept on “L”, O2 is a clock with Ton/Toff ratio.

4. When “Re-start spinning” occurs, the motor speed ramps up to the “Normal Spinning” speed from zero. Speed ramp-up profile

depends on motor characteristics.

AH5798

Document number: DS32001 Rev. 2 - 2

3 of 11

www.diodes.com

June 2010

© Diodes Incorporated

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