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參數(shù)資料
| 型號： | LX1744 |
| 廠商： | Microsemi Corporation |
| 元件分類： | LED驅(qū)動器 |
| 英文描述： | Dual Output Boost ? LED Driver / LCD Bias |
| 中文描述： | 雙輸出升壓？ LED驅(qū)動器/ LCD偏置 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大小： | 571K |
| 代理商： | LX1744 |
LX1744
P
RODUCTION
D
ATASHEET
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 10
W
M
.
C
Dual Output Boost – LED Driver / LCD Bias
I N T E G R A T E D P R O D U C T S
Copyright
2000
Rev. 1.1b, 2005-03-01
A P P L I C A T I O N N O T E
N
EGATIVE
LCD
B
IAS
G
ENERATION
For applications that require it, a negative bias can be
easily generated using an inductorless charge pump
consisting of only four additional discrete components
(Figure 8).
LX1744
V
BAT
= 1.6V to 6.0V
SW
V
OUT
R
1
R
2
FB
- V
OUT
D
3
D
4
Figure 8 –
Negative Bias Generation
This negative output is a mirror of the positive output
voltage. However, it is unregulated.
If a regulated negative bias is desired then this is also
possible with some additional components. A low current
shunt regulator (LX6431 or LX432) and a bipolor pass
element can form a simple negative voltage LDO (Figure
9).
LX1744
V
BAT
= 1.6V to 6.0V
SWx
V
OUT
R
1
R
2
FBx
D
3
D
4
V
NEG_LCD
LX6431,
LX432
R
3
R
4
R
5
Figure 9 –
Regulated Negative Bias
R
3
is sized to meet the minimum shunt current required for
regulation while R
4
and R
5
are calculated. If R
5
is selected
to be 100k
then R
4
is calculated using the following
equation:
=
REF
LCD
_
NEG
V
V
+
5
4
R
R
1
eq. 13
where V
REF
is a -2.5V in the case of the LX6431.
F
EED
-F
ORWARD
C
APACITANCE
Improved efficiency and ripple performance can be
achieved by placing a feed-forward capacitor across the
feedback resistor connected to the LCD Bias output
(Figure 2). A recommended value of 1nF should be used.
PCB
L
AYOUT
Minimizing trace lengths from the IC to the inductor,
diode, input and output capacitors, and feedback
connection (i.e. pin 3) are typical considerations.
Moreover, the designer should maximize the DC input and
output trace widths to accommodate peak current levels
associated with this circuit.
A
P
P
L
I
C
A
T
I
O
N
S
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| LX1744 EVAL KIT | 制造商:Microsemi Corporation 功能描述:LED BACKLIGHT CONTROLLERS AND DRIVERS - Bulk |
| LX1744CLQ | 功能描述:IC LED DRVR WT/CLR BCKLGT 16MLPQ RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 恒定電流:- 恒定電壓:- 拓?fù)?升壓（升壓），切換式電容器（充電泵） 輸出數(shù):1 內(nèi)部驅(qū)動器:是 類型 - 主要:背光 類型 - 次要:白色 LED 頻率:625kHz ~ 875kHz 電源電壓:2.7 V ~ 5.3 V 輸出電壓:5V 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-µMAX 包裝:帶卷 (TR) 工作溫度:-40°C ~ 85°C |
| LX1744CPW | 功能描述:IC LED DRVR WT/CLR BCKLT 14TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 恒定電流:- 恒定電壓:- 拓?fù)?升壓（升壓），切換式電容器（充電泵） 輸出數(shù):1 內(nèi)部驅(qū)動器:是 類型 - 主要:背光 類型 - 次要:白色 LED 頻率:625kHz ~ 875kHz 電源電壓:2.7 V ~ 5.3 V 輸出電壓:5V 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-µMAX 包裝:帶卷 (TR) 工作溫度:-40°C ~ 85°C |
| LX1745 | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:Triple Output Boost ? LED Driver / LCD Bias |
| LX1745 EVAL KIT | 制造商:Microsemi Corporation 功能描述:LED BACKLIGHT CONTROLLERS AND DRIVERS - Bulk |
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