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OZ9939

LCDM Inverter Controller

O2Micro International 

OZ9939

LCDM Inverter Controller

FEATURES

• Negative PWM dimming polarity

• Constant operating frequency

• Drives positive/negative-impedance lamps

during ignition

• High drive current for external MOSFETs

• 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

ORDERING INFORMATION

Part

Number

OZ9939G

OZ9939GN

OZ9939IG

OZ9939IGN

OZ9939D

OZ9939DN

Temp Range

-20oC to 85oC

-20oC to 85oC

-40oC to 85oC

-40oC to 85oC

-20oC to 85oC

-20oC to 85oC

Package

16-pin SOIC

16-pin SOIC

Lead-Free

16-pin SOIC

16-pin SOIC

Lead-Free

16-pin DIP

16-pin DIP

Lead-Free

GENERAL DESCRIPTION

The OZ9939 is a high performance, cost-effective

CCFL (Cold Cathode Fluorescent Lamp)

controller designed for driving large-size Liquid

Crystal Display (LCD) applications requiring 2 to

6 CCFLs.

The controller converts unregulated DC voltages

into a nearly sinusoidal lamp voltage and current

waveforms.

The OZ9939 provides two drive signals for most

power conversion topologies while maintaining

high-efficiency operation. The PWM controller

provides a soft-start operation, current and

voltage regulation, over-voltage and over-current

protection, high drive capability and multiple

dimming functions (internal PWM or external

PWM or analog dimming functions).

The control logic provides a regulated ignition

voltage and appropriate protection features for

over-voltage or over-current conditions.

The OZ9939 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. The proprietary design technique

provides a simple, low-cost system solution.

PIN DIAGRAM

SIMPLIFIED APPLICATION

CIRCUIT

10/27/2005

OZ9939-DS-1.1

Copyright © 2005 by O2Micro

All Rights Reserved

Patent#6,559,606, #6,856,519 & #6,809,93811

Page 1

CONFIDENTIAL

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