LX1990-02 EVAL Microsemi Analog Mixed Signal Group, LX1990-02 EVAL Datasheet

EVAL BOARD FOR LED DRIVER

LX1990-02 EVAL

Manufacturer Part Number
LX1990-02 EVAL
Description
EVAL BOARD FOR LED DRIVER
Manufacturer
Microsemi Analog Mixed Signal Group
Datasheets

Specifications of LX1990-02 EVAL

Current - Output / Channel
30mA
Outputs And Type
2, Non-Isolated
Voltage - Output
10V
Features
Programmable output current
Voltage - Input
2.7 ~ 5.5V
Utilized Ic / Part
LX1990
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
LX1990-02 EVALR
LX1990-02 EVALR
LX1990-02EVAL
LXE1990 EVAL
LXE1990 EVAL
LXE1990-02 EVAL
LXE1990-02 EVAL
Copyright © 2001
Rev. 1.0d, 2005-03-14
sink optimized for driving light emitting
diodes. This low cost bipolar IC enables
precise current regulation in LED
display
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.
mirror architecture that transfers a
reference current produced at the I
pin to each of two open-collector current
sinking outputs.
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
The LX1990 is a dual output current
The LX1990 is based on a current-
TM
lighting
The output stages
applications,
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1990ILM-TR)
D E S C R I P T I O N
-40 to 85
5V
T
yet
SET
O N/OFF
A
(°C)
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.
resistor with a PWM signal.
brightness range can be achieved by
choosing 270 Hz as the PWM frequency (to
avoid optical beating with 50/60 Hz room
lights)
milliseconds to 7.4 microseconds.
via the Enable pin.
LX1990 consumes less than 1µA 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.
R
SET
Light output from LED’s is proportional
This is achieved by driving the I
The LX1990 features a shutdown mode
P R O D U C T H I G H L I G H T
PACKAGE ORDER INFO
and
Integrated Products
®
LM
Microsemi
ENA
ISET
pulse
RoHS Compliant / Pb-free Transition DC: 0452
LX1990
G ND
VDD
Plastic MLP
6-Pin
width
In this mode the
I
I
Dual Programmable LED Current Sink
O U T B
O UT A
LX1990ILM
V
from
LO AD
A 500:1
3.7
SET
• Programmable Sink Current
• Replaces Discrete Transistor
• 300mV Maximum Current Sink
• 2.7 to 5.5V Power Supply Input
• I
• Enable Input With <1µA Sleep
• Amplitude and PWM Dimming
• Current rise and fall time may
• Cell Phone Display Illumination
• PDA White LED Display
• Automotive Display Illumination
• Digital Still Camera
• Camcorders
• Consumer Electronics Front
0.1 to 30mA x 2 Channels
Circuitry With A Single Package
Dropout Voltage at 20mA
0.1 to 10V
Current
be controlled to reduce EMI
Lighting
Panels
OUT
A P P L I C A T I O N S
K E Y F E A T U R E S
Compliance Voltage from
DC
LX1990
Page 1

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LX1990-02 EVAL Summary of contents

Page 1

... IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com 5V - Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1990ILM-TR) Copyright © 2001 Rev. 1.0d, 2005-03-14 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Dual Programmable LED Current Sink ® ...

Page 2

... Copyright © 2001 Rev. 1.0d, 2005-03-14 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Dual Programmable LED Current Sink ® θ A 41°C/W MBIENT JA x θ ESCRIPTION Microsemi Integrated Products LX1990 ISET OUTA VDD 2 GND ENA ACKAGE (Top View) 1990 xxxx LMI ...

Page 3

... LX1990 LX1990 Units Min Typ Max 2.7 5 1.25 0 300 0.1 10 0.1 30 ≤ ≤ T 85°C and the A ≤ 10V. Typical values are 25°C A LX1990 Min Typ Max 1.4 2 3.0 4 0.08 1 0.8 1.55 2 1 300 1.225 1.25 1.275 18.5 20 21.5 * 100 ...

Page 4

... Copyright © 2001 Rev. 1.0d, 2005-03-14 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Dual Programmable LED Current Sink ® 1:1 Current Mirror 1.25V REF - ISET Figure 1 – Simplified Block Diagram Microsemi Integrated Products LX1990 I I OUTA OUTB 100X 100X GND Page 4 ...

Page 5

... UNCTIONAL ESCRIPTION The LX1990 is designed to drive LED’s used in display illumination and signaling applications such as cellular telephones and PDA’s. With a 5V supply, the two independently regulated constant current outputs can drive 2 white LED’s (V < 4.5V) in parallel green or F amber LED’s (V < ...

Page 6

... ENA 2V / AOUT DIV BOUT IOUT 10mA / DIV 4.7 5.7 Microsemi Integrated Products LX1990 ENA=0.4V OUT 5. (V) OUT V vs. Current DROPOUT 30mA 25mA 20mA 15mA 10mA 5mA 0.2 0.3 0.4 0.5 0.6 0.7 0.8 Dropout (V) Enable to Output Response 10µ ...

Page 7

... Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Dual Programmable LED Current Sink ® 3.3V ON/OFF 4K O pen Collector or Open Drain Drive .1µF GRN UTB GRN I O UTA ON/OFF Microsemi Integrated Products LX1990 VDD I O UTB I ENA O UTA ISET GND .1µF + Volts LOAD I VDD O UTB I ENA O UTA ...

Page 8

... ISET GND 8.2nF 1K C SLOPE 5K PWM 2N2222A 10K 100K 1V / DIV 10µA / DIV 20µs / DIV Figure 9 – PWM – Low EMI Wide Range Microsemi Integrated Products LX1990 3V VDD I OUTB ENA I OUTA ISET GND R MIN R MAX Figure 7 – Manual Control ON / OFF I VDD OUTB ENA ...

Page 9

... TM 3.3V ON/OFF PW M 10K 100K Figure 11 – Using the LX1990 With High Voltage Supplies Copyright © 2001 Rev. 1.0d, 2005-03-14 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Dual Programmable LED Current Sink ® Optional circuit for 10 W hite higher efficiency ...

Page 10

... Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Dual Programmable LED Current Sink ® Internally Connected Note: together, but isolated from all other terminals Microsemi Integrated Products LX1990 M I ILLIMETERS NCHES Dim MIN MAX MIN A 2.90 3.10 0.114 B 2.90 3.10 0.114 C ...

Page 11

... Microsemi reserves the right to change the configuration and performance of the product and to discontinue product at any time. Copyright © 2001 Rev. 1.0d, 2005-03-14 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Dual Programmable LED Current Sink ® Microsemi Integrated Products LX1990 Page 11 ...

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