OZ9936 datasheet(2/11 Pages) ETC1

2 / 11 page

OZ9936

04/06/05

OZ9936-DS-1.1

Page 1

©2003-5 by O2Micro

CONFIDENTIAL

ENA_SST_CMP

GNDA

DRV2

DIM

VDDA

DRV1

ISEN

LCD Monitor CCFL Inverter Controller

FEATURES

•

Built-in

intelligence

ignite

positive

impedance CCFLs

•

Low cost LCD monitor inverter solution

•

Constant operating frequency

•

Built-in intelligence for ignition and normal

operation of CCFLs

•

Built-in open-lamp protection and over-

voltage protection

•

Optimized soft-start function

•

Supports both analog and external PWM

dimming control

•

Shutdown

delay

for

input

brownout

condition

•

Higher reliability and longer CCFL life

•

Supports multiple CCFLs

•

Minimum external components

ORDERING INFORMATION

Part Number

Temp Range

Package

OZ9936G

oC to 70oC

8-pin SOIC

OZ9936GN

oC to 70oC

8-pin SOIC,

Leadfree

OZ9936IG

-40

oC to 85oC

8-pin SOIC

OZ9936IGN

-40

oC to 85oC

8-pin SOIC,

Leadfree

OZ9936D

oC to 70oC

8-pin PDIP

OZ9936DN

oC to 70oC

8-pin PDIP,

Leadfree

GENERAL DESCRIPTION

The patent pending OZ9936 is a cost-effective

CCFL (Cold Cathode Fluorescent Lamp) Power

Management controller designed for driving

CCFLs

Liquid

Crystal

Display

(LCD)

applications.

The OZ9936 provides two drive signals for most

power conversion topologies, such as push-pull,

half-bridge, full-bridge or Class-D inverters while

maintaining high-efficiency operation. The highly

integrated controller provides current and voltage

regulation,

soft-start

operation,

over-voltage

protection and an external enabling function while

maintaining a high-degree of design flexibility.

The application requires a minimum number of

off-the-shelf components.

OZ9936 operates at a constant operating

frequency

that

eliminates

any

undesired

interference between the controller and LCD

panel. OZ9936 drives all types of CCFLs and is

able to ignite positive impedance CCFLs.

OZ9936 provides a shutdown delay feature for

input brownout condition.

The control logic provides a regulated ignition

voltage and appropriate protection for over-

voltage or over-current conditions.

The OZ9936 offers a high level of integration,

while maintaining flexibility and high-efficiency

operation that reduces component heating. This

results in higher reliability and longer CCFL life.

The

proprietary

(patent

pending)

design

technique provides a simpler, lower-cost system

solution.

The CCFL backlight controller is designed for

low-cost LCD monitor applications. OZ9936

provides an analog dimming control where the

CCFL brightness is controlled by adjusting the

current amplitude. In addition, the IC provides a

PWM dimming function with an external PWM

signal. The controller converts unregulated DC

voltages into a nearly sinusoidal lamp voltage

and current waveforms.

PIN DIAGRAM

TYPICAL OPERATING

CIRCUIT

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