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參數(shù)資料
| 型號(hào)： | ML4876 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | LCD Backlight Lamp Driver(LCD背光燈驅(qū)動(dòng)器) |
| 中文描述： | 液晶背光燈驅(qū)動(dòng)器（液晶背光燈驅(qū)動(dòng)器） |
| 文件頁(yè)數(shù)： | 1/9頁(yè) |
| 文件大?。?/td> | 171K |
| 代理商： | ML4876 |
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
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
Low switching losses
I
Resonant threshold detection
I
Buck regulator uses synchronous rectification
LINEAR
REGULATOR
MASTER
BIAS
&
UVLO
VDD
VDD
GND
+
–
16V
B ON
B OFF
B SYNC OUT
DR3
DR1
DR1
ONE
SHOT
S
R
Q
Q
NEG
EDGE
DELAY
Q
Q
R
S
Q
Q
R
S
+
–
0.1V
FEA–
–
+
–
+
OSCILLATOR
CLK
RESONANT
THRESHOLD
DETECTOR
–
+
–
+
–
+
0.2V
0.5V
T
Q
Q
DR2
DR2
L RTD
L GATE 1
L GATE 2
LEA–
LEA OUT
C
T
FEA OUT
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 Com-20C to 70C
for Portable Handheld Equipment
* THIS PART IS END OF LIFE AS OF JULY 1, 2000
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ML4877 | LCD Desktop Backlight Lamp Driver(LCD桌面背光燈驅(qū)動(dòng)器) |
| ML4880 | Portable PC/PCMCIA Power Controller(便攜式PC/PCMCIA電源控制器) |
| ML4890 | High Efficiency, Low Ripple Boost Regulator(輸出可調(diào)、小波紋升壓穩(wěn)壓器) |
| ML4894 | Synchronous Buck Controller For DC/DC conversion(用于DC/DC變換的同步補(bǔ)償控制器（5.9V～15V到5V變換）) |
| ML4895 | Synchronous Buck Controller For DC/DC conversion(用于DC/DC變換的同步補(bǔ)償控制器（5.9V～15V到2.5V～4V變換）) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4876CR | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML4876CR/301ER20 UP WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML4876CRX | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML4876ER | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:LCD Backlight Lamp Driver with Contrast |
| ML4876ER-NL4C0092 | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Fairchild Semiconductor Corporation 功能描述: |
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