OZ9992 назначение, описание, схема включения

Микросхема OZ9992, Производитель- O2micro®

FEATURES OZ9992
• Quasi-resonant AC/DC converter controller for high brightness LEDs
• Three-level analog dimming control brightness levels using a Wall Switch (Patent
Pending)
• Low start-up current and operating current maximizing conversion effi ciency
• Peak current mode control simplifi es circuit design
• Under-voltage lockout with hysteresis
• Minimum off-time control for light-load operation maximizing effi ciency
• Constant output power for universal AC input
• Provides complete protection functions:
— Maximum gate drive output at 18.0V
— Over-voltage protection for IC bias voltage
— Cycle-by-cycle current limit at current sense
— LED short circuit protection
— Over-voltage and thermal protection

GENERAL DESCRIPTION OZ9992
OZ9992 is a controller for offl ine AC/DC fl yback converter applications utilizing
quasi-resonant power conversion technology. One application using OZ9992 is for
driving the high power LEDs. It uses a compensated peak current mode control to
regulate the average current through the LEDs.
OZ9992 requires very low start-up current, which maximizes the effi ciency of the
converter and provides a proprietary (patent pending) dimming technology by
turning-on/off the wall switch.

Схема включения OZ9992

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OZ99XX O2Micro
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