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AH5798 Datasheet(PDF) 3 Page - Diodes Incorporated |
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AH5798 Datasheet(HTML) 3 Page - Diodes Incorporated |
3 / 11 page AH5798 SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER AH5798 Document number: DS32001 Rev. 2 - 2 3 of 11 www.diodes.com June 2010 © Diodes Incorporated Functional Block Diagram Frequency Generator Lock detect, Shoutdown and Automatic re-start Soft Switching Control Hall Sensor AMP Vdd FG O1 O2 Power Vss Control Logic Full Bridge Driver Operating FG O1 O2 Ton Toff “Re-start spinning” motor locked cleared motor locked detected Mechanical lock Magentic S N Normal spinning 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. |
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