OZ9994 назначение, описание, схема включения

Микросхема OZ9994, Производитель- O2micro®

FEATURES OZ9994
• Quasi-resonant AC/DC converter controller for high brightness LEDs
• Isolated and Non-Isolated Applications
• Three-level PWM brightness control 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
• Provides complete protection functions
— Maximum gate drive output at 18V
— Over-voltage protection for IC bias voltage
— Cycle-by-cycle current limit at current sense
— LED short circuit protection
— Output over-voltage and internal thermal protection

GENERAL DESCRIPTION OZ9994
OZ9994 is a controller for offl ine AC/DC fl yback converter applications utilizing
quasi-resonant power conversion technology. One application using OZ9994 is for
driving the high power LEDs. The controller uses a compensated peak current mode
control to regulate the average current of the LEDs.
OZ9994 requires very low start-up current which maximizes the effi ciency of the
converter. It provides a proprietary (patent pending) dimming technology by turning
on/off the wall switch.

Схема включения OZ9994

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OZ99XX O2Micro
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