ta9687

4/14/2008

ta9687-DS-1.0 - TPV

Page

1

Copyright

© 2007-2008 by O2Micro

All Rights Reserved

CONFIDENTIAL

Patent # 6,259,615; 6,396,722; 6,804,129; 6,897,698; 7,151,394; 7,026,860; 6,559,606; 6,856,519;

7,120,035; 6,900,993; 6,809,938 and others pending

VSEN

1

SSTCMP

2

CT

3

RT1

4

GNDA

5

PDR2

6

ISEN

14

PWM

13

TIMER

12

VDDA

11

PDR1

10

NDR1

9

NDR2

8

GNDP

7

OVPT

15

ENA

16

LCDM Inverter Controller

FEATURES

•

Constant operating frequency

•

Drives positive/negative-impedance lamps

during ignition

•

High drive current for external MOSFETs

•

User-defined ignition time and shutdown

delay time

•

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

Temp Range

Package

ta9687GN

-20

oC to +85oC

Note(3), page 3

16-pin SOP

Lead-Free

GENERAL DESCRIPTION

ta9687 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 ta9687 supports full-bridge 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, high drive

capability.

The control logic provides a regulated ignition

voltage and appropriate protection features for

over-voltage or over-current conditions.

The ta9687 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

VSEN

1

SSTCMP

2

CT

3

RT1

4

GNDA

5

PDR2

6

ISEN

14

PWM

13

TIMER

12

VDDA

11

PDR1

10

NDR1

9

NDR2

8

GNDP

7

OVPT

15

ENA

16

C25

1u

T22

VIN

GND

PWM

VDDA

ENA

Q5