參數(shù)資料
型號(hào)： LX1990
廠商： Microsemi Corporation
英文描述： Dual Programmable LED Current Sink
中文描述： 可編程LED電流雙水槽
文件頁數(shù)： 1/11頁
文件大?。?/td> 272K
代理商： LX1990
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
Copyright
2001
Rev. 1.0c, 2002-05-29
W
M
.
C
LX1990
Dual Programmable
LED Current Sink
I N T E G R A T E D P R O D U C T S
D E S C R I P T I O N
The LX1990 is a dual output current
sink optimized for driving light emitting
diodes. This low cost bipolar IC enables
precise current regulation in LED
display
lighting
requires far fewer parts than discrete
solutions. The LX1990 is supplied in a
micro-miniature 6 lead MLP package
featuring a 3 x 3 mm footprint, a profile
of less than 1mm, and much improved
thermal performance. Its two output sink
currents are accurately matched and
require only one resistor to program.
Program current is only 1% of the
output currents, and quiescent current is
low, providing a very high efficiency
driver for battery-powered displays.
The LX1990 is based on a current-
mirror architecture that transfers a
reference current produced at the I
SET
pin to each of two open-collector current
sinking outputs. The output stages
multiply this reference current by 100 to
sink independently regulated currents up
to 30 mA.
IMPORTANT:
For the most current data, consult
MICROSEMI
’s website:
http://www.microsemi.com
applications,
yet
Light output from LED’s is proportional
to average current through them; they can
easily produce a brightness range of 500:1.
However, color of emitted light is shifted
by current amplitude. Color shift at low
light levels can be reduced by driving the
LED’s with a constant peak current while
dimming with duty cycle control.
This is achieved by driving the I
SET
resistor with a PWM signal. A 500:1
brightness range can be achieved by
choosing 270 Hz as the PWM frequency (to
avoid optical beating with 50/60 Hz room
lights)
and
pulse
milliseconds to 7.4 microseconds.
The LX1990 features a shutdown mode
via the Enable pin. In this mode the
LX1990 consumes less than 1
μ
A and holds
the two open collector output stages off.
This pin may also be used to pulse width
modulate output current. See applications
section for dimming details.
width
from
3.7
K E Y F E A T U R E S
Programmable Sink Current
0.1 to 30mA x 2 Channels
Replaces Discrete Transistor
Circuitry With A Single Package
300mV Maximum Current Sink
Dropout Voltage at 20mA
2.7 to 5.5V Power Supply Input
I
OUT
Compliance Voltage from
0.1 to 10V
DC
Enable Input With <1μA Sleep
Current
Amplitude and PWM Dimming
Current rise and fall time may
be controlled to reduce EMI
A P P L I C A T I O N S
Cell Phone Display Illumination
PDA White LED Display
Lighting
Automotive Display Illumination
Digital Still Camera
Camcorders
Consumer Electronics Front
Panels
P R O D U C T H I G H L I G H T
5V
LX1990
VDD
I
OUTB
GND
I
OUTA
ISET
R
SET
ENA
V
LOAD
ON/OFF
PACK AGE ORDER INFO
T
A
(
°
C)
LM
Plastic MLP
6-Pin
LX1990ILM
-40 to 85
Note: Available in Tape & Reel.
Append the letter “T” to the part number. (i.e. LX1990ILM-T)
L
X
1
9
9
0
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LX1990_05 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:Dual Programmable LED Current Sink
LX1990-02 EVAL 功能描述:EVAL BOARD FOR LED DRIVER RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估板 - LED 驅(qū)動(dòng)器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:PowerWise® 電流 - 輸出 / 通道:20mA 輸出及類型:1，非隔離 輸出電壓:17V 特點(diǎn):可調(diào)光 輸入電壓:2.7 ~ 5.5 V 已供物品:板 已用 IC / 零件:LM3508 相關(guān)產(chǎn)品:LM3508TLX-ND - IC LED DRVR WHT BCKLGT 9USMDLM3508TLDKR-ND - IC LED DRVR WHT BCKLGT 9MICROSMDLM3508TLCT-ND - IC LED DRVR WHT BCKLGT 9MICROSMDLM3508TLTR-ND - IC LED DRVR WHT BCKLGT 9MICROSMD
LX1990-02 EVAL KIT 制造商:Microsemi Corporation 功能描述:LED BACKLIGHT CONTROLLERS AND DRIVERS - Bulk
LX1990-02EVAL 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LED Driver
LX1990-02W EVAL 制造商:Microsemi Corporation 功能描述:LED BACKLIGHT CONTROLLERS AND DRIVERS - Bulk
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