Datasheet > LT1768

LT1768

更新时间： 2023-12-20 18:46:29

品牌	Logo	应用领域
亚德诺 - ADI		控制器
页数	文件大小	规格书
20页	298K
描述
用于实现宽调光范围和最大灯寿命的高功率 CCFL 控制器

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LT1768 数据手册

LT1768

High Power CCFL Controller

for Wide Dimming Range and

Maximum Lamp Lifetime

DESCRIPTIO

FEATURES

■

Ultrawide Multimode Dimming^TMRange

The LT^®1768 is designed to control single or multiple cold

cathode fluorescent lamp (CCFL) displays. A unique Mul-

timodeDimmingscheme*combinesbothlinearandPWM

control functions to maximize lamp life, efficiency, and

dimming range. Accurate maximum and minimum lamp

currents can be easily set. The LT1768 can detect and

protect against lamp failures and overvoltage start-up

conditions. It is designed to provide maximum flexibility

with a minimum number of external components.

■

Multiple Lamp Capability

■

Programmable PWM Dimming Range and

Frequency

■

Precision Maximum and Minimum Lamp

Currents Maximize Lamp Lifetime

■

No Lamp Flicker Under All Supply and Load

Conditions

■

Open Lamp Detection and Protection

■

350kHz Switching Frequency

The LT1768 is a current mode PWM controller with a 1.5A

MOSFET driver for high power applications. It contains a

350kHz oscillator, 5V reference, and a current sense

comparator with a 100mV threshold. It operates from an

8Vto24Vinputvoltage.TheLT1768alsohasundervoltage

lockout, thermal limit, and a shutdown pin that reduces

supply current to 65µA. It is available in a small 16-lead

SSOP package.

■

1.5A MOSFET Gate Driver

■

100mV Current Sense Threshold

■

5V Reference Voltage Output

The 16-Lead SSOP Package

■

APPLICATIO S

■

Desktop Flat Panel Displays

■

Multiple Lamp Displays

, LTC and LT are registered trademarks of Linear Technology Corporation.

Multimode Dimming is a trademark of Linear Technology Corporation.

*Patent Pending

■

Notebook LCD Displays

Point of Sale Terminal Displays

■

TYPICAL APPLICATIO

33pF

LAMP

C4-WIMA MKP2

L1-COILTRONICS UP4-680

T1-2 CTX110607 IN PARALLEL

Q1-ZDT1048

LAMP

33pF

*R5 CAN BE METAL PCB TRACE

8V – 24V

Lamp Output and Dimming

Ratio vs Lamp Current

33µF

0.33µF

10000

1000

100

PGND

DI02

GATE

250Ω

1/4W

DIMMING RATIO (NITS/NITS)

LAMP OUTPUT (NITS)

DI01

REF

0.1µF

SENSE

FAULT

SHDN

LT1768

68µH

0.033µF

AGND

MIN

16.2k

MBRS130T3

40.2k

MAX

LAMP MANUFACTURERS

SPECIFIED CURRENT RANGE

0.1µF

Si3456DY

PROG

PWM

0.1

PROG

0V TO 5V OR

1kHz PWM

100

60.4k

LAMP CURRENT (mA)

10µF

49.9k

R5*

0.025

1768 TA01b

2200pF

1768 TA01

Figure 1. 14W CCFL Supply Produces a 100:1 Dimming Ratio While

Maintaining Minimum and Maximum Lamp Current Specifications

12 3 4 5 6 7...20

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