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參數(shù)資料
| 型號(hào)： | ML4877 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | LCD Desktop Backlight Lamp Driver(LCD桌面背光燈驅(qū)動(dòng)器) |
| 中文描述： | 液晶背光燈驅(qū)動(dòng)器桌面（液晶桌面背光燈驅(qū)動(dòng)器） |
| 文件頁數(shù)： | 1/11頁 |
| 文件大小： | 288K |
| 代理商： | ML4877 |
JULY 2000
ML4877
*
LCD Desktop Backlight Lamp Driver
1
GENERAL DESCRIPTION
The ML4877 is an ideal solution for driving multiple cold
cathode fluorescent tubes (CCFL) used in liquid crystal
display (LCD) backlight applications. It provides dimming
ballast control for the LCD display.
By utilizing differential drive the ML4877 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 IC includes an adjustable lamp out detect circuit that
latches the IC off when a lamp fault is detected. Also, the
unique architecture of the ML4877 allows the
development of a backlight system that will inherently
meet the UL requirements for safety.
The ML4877 is optimized for large LCD applications
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
I
Ideal for 30W inverter designs, 1 to 8 lamp design
I
PWM dimming capability
I
Backlight lamp driver with differential drive
I
Up to 30% lower power for same light output
I
Low standby current (<10μA)
I
Improved efficiency (
95%)
I
Allows all N-channel MOSFET drive
I
Adjustable lamp out detect with latch
I
Resonant threshold detection and synchronous
rectification
I
Positive input for dimming control
LINEAR
REGULATOR
MASTER
BIAS
&
UVLO
12
5
13
VDD
VDD
AZR
2
15
+
–
VDD
10
B ON
19
B OFF
20
11
DR3
DR1
DR1
Q
Q
R
S
OSCILLATOR
CLK
9
C
T
–
+
–
+
3
7
T
Q
Q
14
16
DR2
DR2
L RTD
L GATE 1
L GATE 2
LEA–
SS CAP
ON/OFF
VREF
HVDD
17
PGND
18
GND
1
4
R
T
8
LEA OUT
0.5V
6
L ILIM
B SYNC OUT
–
+
RESONANT
THRESHOLD
DETECTOR
NEG
EDGE
DELAY
S
R
Q
Q
ONE
SHOT
LEA+
SS
SS
* THIS PART IS END OF LIFE AS OF JLLY 1, 2000
NEW!
30W CCFL Inverter Design
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4877CR | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:LCD Desktop Backlight Lamp Driver |
| ML4877ER | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:LCD Desktop Backlight Lamp Driver |
| ML4880 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Portable PC/PCMCIA Power Controller |
| ML4880CS | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Portable PC/PCMCIA Power Controller |
| ML4880ES | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Portable PC/PCMCIA Power Controller |
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