Datasheet > ML4876ER

ML4876ER

更新时间： 2024-11-08 22:54:47

品牌	Logo	应用领域
MICRO-LINEAR		驱动器光电二极管
页数	文件大小	规格书
9页	177K
描述
LCD Backlight Lamp Driver with Contrast

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中文翻译

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数据手册

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ML4876ER 数据手册

JULY 2000

FEATURING

ML4876*

LCD Backlight Lamp Driver with Contrast

GENERAL DESCRIPTION

FEATURES

The ML4876 is an ideal solution for driving small cold

cathode fluorescent tubes (CCFL) used in liquid crystal

display (LCD) backlight applications. It provides the

dimming ballast control and the contrast control for the

LCD display.

■ Backlight lamp driver with differential drive

■ Up to 30% lower power for same light output

■ Low standby current (< 10µA)

■ Improved efficiency (»95%)

By utilizing differential drive the ML4876 can deliver the

same light output with significantly less input power

compared to existing single ended drive schemes.

Improvements as high as 30% can be realized when using

low power lamps and advanced LCD screen housings. This

increased light output is achieved because the differential

drive configuration is much less sensitive, and therefore

less power is wasted in the capacitive parasitics that exist

in the backlight housing. An additional benefit of this

configuration is an even distribution of light.

■ Allows all N-channel MOSFET drive

■ Low switching losses

■ Resonant threshold detection

■ Buck regulator uses synchronous rectification

The ML4876 is optimized for portable applications where

high efficiency is critical to maximize battery life. The

high efficiency is achieved by a resonant scheme with

zero voltage switching.

* THIS PART IS END OF LIFE AS OF JULY 1, 2000

BLOCK DIAGRAM

GND

B OFF

B SYNC OUT

VDD

B ON

L RTD

VDD

HVDD

L GATE 1

DR3

DR1

LINEAR

REGULATOR

DR2

ON/OFF

ONE

SHOT

NEG

EDGE

DELAY

MASTER

BIAS

UVLO

L GATE 2

VREF

–

LON

0.5V

16V

–

F GATE

RESONANT

THRESHOLD

DETECTOR

–

F ILIM

LEA–

–

0.1V

FEA–

0.2V

CLK

OSCILLATOR

–

FEA+

LEA OUT

FEA OUT

12 3 4 5 6 7...9

中文翻译

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