ML4876 datasheet(1/9 Pages) MICRO-LINEAR

tên linh kiện	ML4876

Giải thích chi tiết về linh kiện	LCD Backlight Lamp Driver with Contrast

PDF	9 Pages

Scroll/Zoom	100%

nhà sản xuất	MICRO-LINEAR [Micro Linear Corporation]

Trang chủ	http://www.microlinear.com

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JULY 2000

ML4876*

LCD Backlight Lamp Driver with Contrast

1

GENERAL DESCRIPTION

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.

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.

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.

BLOCK DIAGRAM

FEATURES

s

Backlight lamp driver with differential drive

s

Up to 30% lower power for same light output

s

Low standby current (< 10µA)

s

Improved efficiency (

»95%)

s

Allows all N-channel MOSFET drive

s

Low switching losses

s

Resonant threshold detection

s

Buck regulator uses synchronous rectification

LINEAR

REGULATOR

MASTER

BIAS

&

UVLO

VDD

GND

+

–

16V

B ON

B OFF

B SYNC OUT

DR3

DR1

ONE

SHOT

S

RQ

Q

NEG

EDGE

DELAY

Q

QR

S

Q

QR

S

+

–

0.1V

–

+

–

+

OSCILLATOR

CLK

RESONANT

THRESHOLD

DETECTOR

–

+

–

+

–

+

0.2V

0.5V

T

Q

DR2

L RTD

L GATE 1

L GATE 2

LEA–

LEA OUT

CT

FEA OUT

FEA+

FEA–

F ILIM

F GATE

LON

VREF

ON/OFF

HVDD

1

9

8

7

16

14

10

3

2

20

12

4

5

6

15

13

17

18

19

11

FEATURING

Extended Commercial

Temperature

Range

-20˚C to 70˚C

for Portable

Handheld Equipment

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

Số phần tương tự - ML4876

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
Micro Linear Corporatio...	ML4870	211Kb / 8P	High Current Boost Regulator with Load Disconnect
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	ML4870CS-5	211Kb / 8P	High Current Boost Regulator with Load Disconnect
	ML4870ES-3	211Kb / 8P	High Current Boost Regulator with Load Disconnect
	ML4870ES-5	211Kb / 8P	High Current Boost Regulator with Load Disconnect

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Mô tả tương tự - ML4876

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
Maxim Integrated Produc...	MAX753	103Kb / 16P	CCFL Backlight and LCD Contrast Controllers Rev 1; 1/95
Micro Linear Corporatio...	ML4877	289Kb / 11P	LCD Desktop Backlight Lamp Driver
Interpion semiconductor	DIT8545	188Kb / 8P	Ceratrans Driver for LCD Backlight
Advantech Co., Ltd.	DSD-7046	820Kb / 2P	46" LCD with LED backlight
Advantech Co., Ltd.	DSD-7055	869Kb / 2P	55" LCD with LED backlight
Texas Instruments	LM36272	695Kb / 9P	Integrated Backlight Driver With Integrated LCD Bias
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BCD Semiconductor Manuf...	AP3068	393Kb / 15P	WHITE LED DRIVER FOR LCD PANEL BACKLIGHT
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