OZ964_ 데이터 시트보기 (PDF) - O2Micro International

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OZ964_

Intelligent Lighting Family Product Guide

O2Micro International 

OZ9935

FEATURES

• VSYNC synchronization for LPWM dimming frequency

• Independent PWM and analog dimming control

• Supports positive impedance (dark effect) lamps during ignition

• Constant operating frequency

• Built-in intelligence for ignition and normal operation of CCFLs

• User-defined ignition time and shutdown delay time

• Built-in open-lamp and over-voltage protection

• Optimized soft start function

GENERAL DESCRIPTION

The OZ9935 is a high performance Cold Cathode Fluorescent Lamp (CCFL) control-

ler designed to drive large-size Liquid Crystal Display Monitor (LCDM) applications.

OZ9935 provides two drive signals for most power conversion topologies, while

maintaining high-efficiency operation. The controller provides a soft start operation,

current and voltage regulation, over-voltage and over-current protection, indepen-

dent pins for Pulse Width Modulation (PWM) and analog dimming control coupled

with high drive capability.

During Low frequency PWM (LPWM) dimming, the LPWM frequency is synchronized

with an external VSYNC signal by a factor of 4 times. The control logic provides a

regulated ignition voltage and offers a high level of integration, while maintaining

flexibility and high-efficiency operation that reduces external component heating,

resulting in higher reliability and longer CCFL life.

APPLICATIONS

• LCD Monitor

APPLICATION DIAGRAM

U.S. Patent #’s 6,259,615; 6,396,722; 6,559,606; 6,804,129; 6,809,938; 6,856,519; 6,900,993; 7,120,035; and more

patents pending.

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