OZ964_ 데이터 시트보기 (PDF) - O2Micro International

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OZ964_

Intelligent Lighting Family Product Guide

O2Micro International 

OZ9938

FEATURES

• Positive PWM dimming polarity

• Constant operating frequency

• Supports positive impedance (dark effect) lamps during ignition

• User-defined ignition time and shutdown delay time

• Multiple mode dimming control

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

• Built-in open-lamp protection and over-voltage protection for backlight system

• Optimized soft start function

GENERAL DESCRIPTION

OZ9938 is a high performance Cold Cathode Fluorescent Lamp (CCFL) controller

designed to drive large-size Liquid Crystal Display (LCD) applications.

The OZ9938 provides two drive signals for most power conversion topologies while

maintaining high efficiency operation. The Pulse Width Modulation (PWM) controller

provides soft start operation, current and voltage regulation, over-voltage and over-

current protection, high drive capability and multiple dimming functions (internal or

external PWM or analog dimming functions).

The control logic provides a regulated ignition voltage and appropriate protection

features for over-voltage and over-current conditions.

APPLICATIONS

• LCD Monitor

• Notebook Computer

• Digital Photo Frame

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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