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參數(shù)資料
| 型號： | LX1745 |
| 廠商： | Microsemi Corporation |
| 元件分類： | LED驅動器 |
| 英文描述： | Triple Output Boost ? LED Driver / LCD Bias |
| 中文描述： | 三路輸出升壓？ LED驅動器/ LCD偏置 |
| 文件頁數(shù)： | 1/16頁 |
| 文件大?。?/td> | 439K |
| 代理商： | LX1745 |
LX1745
P
RODUCTION
D
ATASHEET
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
W
M
.
C
Triple 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. 1.1a, 2004-02-06
DESCRIPTION
guaranteed at a V
IN
equal to 1.6V with
sustained operation as low as 1.1V.
The maximum LED drive current is
easily programmed using one external
current sense resistor in series with the
LEDs. In this configuration, LED current
provides a feedback signal to the FB pin,
maintaining constant current regardless of
varying
LED
Depending on the MOSFET selected, the
LX1745 is capable of achieving an LED
drive in excess of 1.0W.
The LX1745 provides simple dynamic
adjustment of the LED drive current (0% to
100% full range dimming) and the LCD
Bias output voltages (up to
±
15% typ)
through separate IC interfaces. Each
interface has an internal RC filter allowing
designers to make these adjustments via a
direct PWM input signal or an analog
reference signal. Further, any PWM
amplitude is easily accommodated using a
single external resistor.
The LX1745 is available in the low-
profile 20-Pin TSSOP.
The LX1745 is a compact high
efficiency step-up boost regulator for
driving white or color LEDs in LCD
lighting applications while supplying the
necessary LCD bias voltages with an
additional two integrated boost converters.
Designed for maximum efficiency and
featuring
a
psuedo-hysteretic
topology (that decreases output voltage
ripple), the LX1745 minimizes system cost
and condenses layout area making it ideal
for PDA, smart-phone, and digital camera
applications.
While the LCD Bias generation is
implemented using an internal N-Channel
MOSFET for LCD Bias generation, the
LED driver utilizes an external N-Channel
MOSFET in order to maintain maximum
efficiency along with flexible power
requirements..
The LX1745’s control circuitry is
optimized for portable systems with a
shutdown current of less than 1μA. The
input voltage range of 1.6V to 6.0 allows
for a wide selection of system battery
voltages
and
IMPORTANT:
For the most current data, consult
MICROSEMI
’s website:
http://www.microsemi.com
PFM
start-up
is
forward
voltage
(V
F
).
KEY FEATURES
> 90% Maximum Efficiency
Low Quiescent Supply Current
Externally Programmable Peak
Inductor Current Limit For
Maximum Efficiency
Logic Controlled Shutdown
< 1μA Shutdown Current
Dynamic Output LED Current
and Two LCD Bias Voltage
Adjustments Via Analog
Reference Or Direct PWM
Input
20-Pin TSSOP Package
APPLICATIONS
Pagers
Smart Phones
PDAs
Handheld Computers
General LCD Bias Applications
LED Driver
PRODUCT HIGHLIGHT
C
1
4.7μ
F
L
1
47
μ
H
1206 Case Size
LX1745
LFB
CS
DRV
IN
SRC
R
SET
15
V
BAT
= 1.6V to 6.0V
I
LED
= 20mA to 0mA
OVP
SW1
V
LCD1
= V
IN
to 25V
FB1
- V
LCD
BRT
LSHDN
ON OFF
SW2
FB2
V
LCD2
= V
IN
to 25V
REF
ADJ1
SHDN1
ON OFF
GND
ADJ2
SHDN2
ON OFF
LX1745 Evaluation Board
PACKAGE ORDER INFO
T
A
(
°
C)
PW
Plastic TSSOP
20-Pin
LX1745-CPW
-40 to 85
Note: Available in Tape & Reel.
Append the letter “T” to the part number.
(i.e. LX1745-CPWT)
L
X
1
7
4
5
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相關代理商/技術參數(shù) |
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|---|---|
| LX1745 EVAL KIT | 制造商:Microsemi Corporation 功能描述:LED BACKLIGHT CONTROLLERS AND DRIVERS - Bulk |
| LX1745_06 | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:Triple Output Boost a?? LED Driver / LCD Bias |
| LX1745CPW | 功能描述:IC LED DRVR WT/CLR BCKLT 20TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅動器 系列:- 標準包裝:1 系列:- 恒定電流:- 恒定電壓:- 拓撲:PWM，切換式電容器（充電泵） 輸出數(shù):1 內部驅動器:是 類型 - 主要:背光 類型 - 次要:白色 LED 頻率:642kHz 電源電壓:2.7 V ~ 5.5 V 輸出電壓:5V 安裝類型:表面貼裝 封裝/外殼:10-VFDFN 裸露焊盤 供應商設備封裝:10-VSON 包裝:剪切帶 (CT) 工作溫度:-30°C ~ 85°C 產品目錄頁面:1371 (CN2011-ZH PDF) 其它名稱:BD1603NUV-E2CT |
| LX1745-CPW | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:Triple Output Boost ? LED Driver / LCD Bias |
| LX1752 | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:Dual Interleaving PWM Controller |
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