Diodes AH5794 Manuel d'utilisateur télécharger pdf (Page 6)

AH5794

SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER

AH5794

Document number: DS35809 Rev. 1 - 2

6 of 13

www.diodes.com

March 2012

NEW PRODUCT

Operating Characteristics (Note 6, 7, 8 and 9)

Ton

Toff

“Re-start spinning”

motor locked cleared

motor locked detected

Mechanical lock

Magentic

Normal spinning

Truth Table

O1 O2 FG

L H L

H L H

L L

(Note 9)

Notes: 6. In “Normal spinning, the FG changes its state at each edge of O1.

7. 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.

8. 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.

9. X: H or L depends on magnetic pole North or South

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Diodes AH5794 Manuel d'utilisateur Page 6