Datasheet > 电源电路 > 开关式稳压器或控制器> LT1942

LT1942

更新时间： 2024-10-02 22:51:47

品牌	Logo	应用领域
凌特 - Linear		驱动器转换器
页数	文件大小	规格书
16页	249K
描述
Quad DCDC Converter for Triple Outputs TFT Supply Plus LED Driver

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中文翻译

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数据手册

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LT1942 数据手册

LT1942

Quad DC/DC Converter

for Triple Output TFT Supply

Plus LED Driver

FEATURES

DESCRIPTIO

The LT^®1942 is a highly integrated quad switching regu-

lator designed to provide all necessary power supply

functions for TFT displays, including the white LED

backlight driver. The TFT supply incorporates two boost

and one inverting DC/DC converters. The TFT supply

output voltages are independently set, unlike charge

pump solutions which have many limitations. Power

sequencing for the TFT supply is built into the part and is

user programmable.

■

Triple Output TFT Supply with Built-In

Power Sequencing

■

Integrated White LED Backlight Driver

■

Integrated Schottky Diodes

■

Active Ballast Circuitry Ensures Precise Current

Matching in White LEDs

■

Low Noise 1MHz Fixed Frequency Operation

■

2.6V to 16V Input Voltage Range

Soft-Start Limits Inrush Current

■

TFT Supply Output Voltages Independently Set

The LED driver is a boost DC/DC converter that can be

independently controlled. The LED driver has built-in

dimming control for precise control of LED current. An 8:1

dimming range is achieved by adjusting the CTRL4

voltage.The user can elect to drive a single string or two

strings of LEDs. An LED ballast circuit is included to

preciselymatchtheLEDcurrentsiftwostringsofLEDsare

used. Soft-start is built into the LED driver as well as the

primary TFT supply.

(Not Charge Pump Derived)

■

Power Good and Output Disconnect for TFT Supply

■

Built-In LED Dimming Capability

■

Open LED Protection for LED Driver

■

24-Lead QFN Package (4mm × 4mm)

APPLICATIO S

■

Poly-Silicon TFT Displays

Amorphous Silicon TFT Displays

■

The LT1942 is available in a low profile (0.75mm) 24-lead

QFN (4mm × 4mm) package.

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

All other trademarks are the property of their respective owners.

TFT Bias and White LED Backlight Power Supply

CMDSH-3

22µH

Si2301BDS

3V TO 4.2V

22µH

40mA

0.22µF

301k

100k

4.7pF

698k

100k

FB3

SW3

SW1

FB1

0.22µF

4.7µF

20mA

4.7µF

10V

PGND14

PGOOD

SW4

2mA

PGND23

10k

OUT3

LT1942

33µH

0.22µF

NFB2

665k

LED1

LED2

47µH

–10V

2mA

OFF

0.1µF

SW2

SHDN

CTRL4 AGND SS1

FB4

SS4 CT

SGND/

SHUTDOWN

1942 TA01

4.99Ω

0.1µF

LED CONTROL

1942fa

12 3 4 5 6 7...16

中文翻译

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与LT1942相关器件

型号	品牌	获取价格	描述	数据表
LT1942EUF	Linear	获取价格	Quad DCDC Converter for Triple Outputs TFT Supply Plus LED Driver
LT1942EUF#PBF	Linear	获取价格	LT1942 - Quad DC/DC Converter for Triple Output TFT Supply Plus LED Driver; Package: QFN;
LT1942EUF#TR	Linear	获取价格	暂无描述
LT1942EUF#TRPBF	Linear	获取价格	暂无描述
LT1943	Linear	获取价格	High Current Quad Output Regulator for TFT LCD Panels
LT1943	ADI	获取价格	用于 TFT LCD 屏的高电流、四路输出稳压器
LT1943_1	Linear	获取价格	High Current Quad Output Regulator for TFT LCD Panels
LT1943EFE	Linear	获取价格	High Current Quad Output Regulator for TFT LCD Panels
LT1943EFE#PBF	Linear	获取价格	LT1943 - High Current Quad Output Regulator for TFT LCD Panels; Package: TSSOP; Pins: 28;
LT1943EFE#TR	Linear	获取价格	暂无描述

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