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LX1686CPW

更新时间： 2024-11-10 22:46:51

品牌	Logo	应用领域
美高森美 - MICROSEMI		控制器
页数	文件大小	规格书
5页	140K
描述
Digital Dimming CCFL Controller IC

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中文翻译

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数据手册

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LX1686CPW 数据手册

RangeMAX^TM

LX1686

DI G I TA L DI M M I N G CCFL CO N T R O L L E R IC

T H E I N F I N I T E P O W E R O F I N N O V A T I O N

P R E L I M I N A R Y D A T A S H E E T

DESCRIPTION

KEY FEATURES

■ RangeMAX^TMWide Range Dimming (>100:1)

■ Synchronizable To Display Video Frequency

■ High Voltage Feedback Loop Directly

Controls Maximum Open Lamp And

Minimum Strike Voltages

■ Transformer Protected From Over-Heating

During Lamp Striking

■ Micro-Amp Sleep Mode

■ User-Programmable Fixed Frequency

Operation

■ Under-Voltage Lockout Feature With Power-

Up Reset

■ Built-In Soft-Start Feature

■ Operates With 3.3V or 5V Power Supplies

■ 100mA Output Drive Capability

The LX1686 Backlight Controller IC

provides all the control functions needed

to implement Linfinity’s direct drive in-

verters used to operate cold cathode fluo-

rescent lamps (CCFL’s). This IC can be

used to control single or multiple-lamp

configurations. CCFL’s are used for back

or edge lighting of liquid crystal flat panel

displays (LCD’s) and typically find appli-

cation in notebook computers, web

browsers, automotive and industrial in-

strumentation, and entertainment sys-

tems.

The LX1686 includes a PWM con-

trolled lamp current burst circuit that

can provide a >100:1 dimming range from

a simple zero to 2.5V potentiometer in-

put. The PWM dimming burst rate is

easily synchronized to the LCD panel’s

frame rate to prevent interference from

optical beat frequencies.

Safety and reliability features in-

clude a new dual feedback contol loop

that permits regulation of maximum lamp

strike voltage as well as lamp current.

Regulating maximum lamp voltage per-

mits the designer to provide for ample

worst case lamp strike voltage while at

the same time conservatively limit maxi-

mum open circuit voltage.

An innovative new strike voltage

generation techniqueenables the mod-

ule designer to optimize high voltage

transformer design for maximum oper-

ating efficiency with no power dissipat-

ing overhead to guarantee strike capa-

bility.

Direct drive topology is a non-reso-

nant, oscillator-controlled PWM regu-

lation method. The LX1686 allows a

wide choice of fixed operating frequen-

cies to match lamp current frequency to

the lamp’s most efficient operating point,

and to minimize high frequency interfer-

ence.

APPLICATIONS

■ Notebooks

■ Instrumentation Displays

■ Desktop Computer Monitors

■ Low Ambient Light Displays (used in

Aircraft, Automobiles, and Hand-held

Equipment)

BENEFITS

■ Extemely High Efficiency From 3.3V or 5V

Power Supplies

■ Lower Cost Than Conventional Buck / Royer

Inverter Topologies

■ Improved Lamp Strike Capability

■ Improved Over-Voltage Control

NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.

PRODUCT HIGHLIGHT

RANGEMAX VS. ANALOG DIMMING

Light emitted by a CCFL is proportional to the current

flowing through it. There are two ways to control the

current: by adjusting the amplitude of a continuous AC

current; or, as with RangeMAX technology, by varying

the amount of time a burst of full current is present.

RangeMAX technology frees the backlight inverter

module designer to operate in a lower brightness and

lower power consumption mode than is possible with

conventional amplitude control methods.

Standard Analog

Dimming Inverter

LinFinity's

RangeMAX

105

Light Output (Nits)

PACKAGE ORDER INFO

Plastic TSSOP

24-pin

T_A(°C)

0 to 85

LX1686CPW

Note: All surface-mount packages are available in Tape & Reel.

Append the letter "T" to part number. (i.e. LX1686CPWT)

L I N F I N I T Y M I C R O E L E C T R O N I C S I N C .

11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570

Rev. 0.4 1/00

12 3 4 5

中文翻译

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与LX1686CPW相关器件

型号	品牌	获取价格	描述	数据表
LX1686CPWT	MICROSEMI	获取价格	Fluorescent Light Controller, Voltage-mode, 256kHz Switching Freq-Max, BICMOS, PDSO24, PLA
LX1686CPW-TR	MICROSEMI	获取价格	Fluorescent Light Controller, 256kHz Switching Freq-Max, PDSO24, LEAD FREE, PLASTIC, TSSOP
LX1686E	MICROSEMI	获取价格	Digital Dimming CCFL Controller IC
LX1686ECPW	MICROSEMI	获取价格	Digital Dimming CCFL Controller IC
LX1686ECPW-TR	MICROSEMI	获取价格	Fluorescent Light Controller, 256kHz Switching Freq-Max, PDSO24, ROHS COMPLIANT, PLASTIC,
LX1686EIPW	MICROSEMI	获取价格	Digital Dimming CCFL Controller IC
LX1686EIPW-TR	MICROSEMI	获取价格	Fluorescent Light Controller, 256kHz Switching Freq-Max, PDSO24, ROHS COMPLIANT, PLASTIC,
LX1686IPW	ETC	获取价格	CCFL Backlight Controller IC
LX1686IPWT	MICROSEMI	获取价格	Fluorescent Light Controller, 256kHz Switching Freq-Max, BICMOS, PDSO24, PLASTIC, TSSOP-24
LX1686PW	MICROSEMI	获取价格	Fluorescent Light Controller, Voltage-mode, 242kHz Switching Freq-Max, BICMOS, PDSO24, PLA

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