LX1991 EVAL KIT Microsemi Analog Mixed Signal Group, LX1991 EVAL KIT Datasheet

LX1991 EVAL KIT

Manufacturer Part Number

LX1991 EVAL KIT

Description

KIT EVALUATION FOR LED DRIVER

Manufacturer

Microsemi Analog Mixed Signal Group

Datasheets

1.LX1991ILQ.pdf (9 pages)

2.LX1991-03EVAL.pdf (6 pages)

Specifications of LX1991 EVAL KIT

Current - Output / Channel

30mA

Outputs And Type

6, Non-Isolated

Voltage - Output

40V

Features

Dimmable

Voltage - Input

4.5 ~ 5.5V

Utilized Ic / Part

LX1991

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Other names

57706
LX1991-EVAL
LX1991EVALKIT
LX1991EVALKIT
LXE1991-01 EVAL KIT
LXE1991-01EVALKIT
LXE1991-01EVALKIT

Current page: 1 of 9
Download datasheet (276Kb)

Rev. 1.1, 10/27/2005

current sink driver is ideal for controlling

brightness

dimmable LED displays. High accuracy,

dual mode dimming, and controlled current

switching time provides consistent color

hue, at brightness ratios of up to 1000:1,

and keeps electro magnetic emissions in

check.

combined with 43 volt breakdown cap-

ability

automotive in-dash displays.

current mirror circuitry sets all channels to

the same current with a single programming

input. Sinking current value can be pro-

grammed up to 30 mA per channel with a

single resistor or potentiometer from I

pically within ±1 percent of channel mean

at the rated output current.

can be achieved by controlling either

current amplitude or duty cycle, and both

methods can be employed at the same time.

IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com

SET

LED Display Driver: This six channel

Precision current control:

Dual Mode Dimming: Display dimming

Its wide compliance voltage range

. Channel to channel matching is ty-

PWM

SIGNAL

make

SLEW CONTROL

OFF

and

the

1.5K

-40 to 85

hue

LX1991

(°C)

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

LX1991

CSLOPE

DIG_DIM

ENA

ISET+

ISET-

Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1991ILQ-TR)

LX1991

high

VDD

GND

SINK1

SINK2

SINK3

SINK4

SINK5

SINK6

ideal

D E S C R I P T I O N

Precision

quality

SET

54 White LED’s

for

@20mA

~3.7V

4.5

+36V

input accepts a TTL or CMOS logic signal

that controls duty cycle of the output

currents.

feature independent regulation with respect

to output voltage, so one does not affect the

others. Any one or more outputs can be left

unloaded

regulation of the other channels. Multiple

channels can also be connected together to

sink more current in a single load.

currents are precisely controlled by placing

a capacitor on the SLOPE_C pin. Special

control circuitry maintains symmetrical rise

and fall times, preserving the LX1991’s

ability to provide accurate output current

response to very narrow input pulses on the

DIG_DIM pin.

supplied in a 4x4 MLPQ package capable

of 1.5 watts dissipation. Logic Enable: A

separate input puts the LX1991 to sleep at

less than 1 uA I

P A C K A G E O R D E R I N F O

P R O D U C T H I G H L I G H T

Independent Channels: The six channels

EMI Control: Rise and fall time of sink

Power

1000:1 Dimming Range: The DIG_DIM

Integrated Products

Microsemi

Handling:

without

5.5V

Six Output Programmable LED Current Sink

affecting

The

RoHS Compliant / Pb-free Transition DC: 0436

LX1991

RODUCTION

current

Plastic 4x4 MLPQ

16-PIN

LX1991ILQ

Bill of Materials

ATA

K E Y F E A T U R E S

Six precision independent

current sink channels

Simultaneous Analog and

Digital Dimming Modes

current rise & fall times

1% band gap reference

40 volt rated output stages

3V / 5V logic input compatible

1.5 watt power dissipation

On-chip thermal shutdown

16 Pin 4 x 4 MLPQ Package

Consistent LED color hue

results from high current

accuracy

1000:1 dimming ratio with

digital dimming

Lowered emissions with

current slope programming

Reduced component count

for compact designs

Drive up to 108 colored

LED’s per IC (6 x 18 @ 2.1

volts)

Drive up to 60 white or blue

LED’s per IC (6 x 10 @ 3.8

volts)

Precision programming of

White LEDs

Total Count

HEET

B E N E F I T S

LX1991

Resistor

Cap

LX1991

Page 1

Related parts for LX1991 EVAL KIT

LX1991 EVAL KIT Summary of contents

Page 1

LED Display Driver: This six channel current sink driver is ideal for controlling brightness and hue of high quality dimmable LED displays. High accuracy, dual mode dimming, and ...

Page 2

Supply Voltage (VDD ) ............................................................................... -0. Analog Output Voltage (SINK to SINK 1 Analog Inputs ...

Page 3

Parameter Supply Voltage ( ENABLE Input Voltage ...

TM Unless otherwise specified, the following specifications apply over the operating ambient temperature –40°C <TA < 85°C except where otherwise noted and with the following test conditions Parameter POWER Power Supply Input Voltage Quiescent current Quiescent current 1 ...

Page 5

TM THEORY OF OPERATION / APPLICATION NOTE F D UNCTIONAL ESCRIPTION The LX1991 is designed to drive LED’s used in display illumination and signaling applications such as cellular telephones, PDA’s automotive dashboard illumination etc. With a single 5V supply, the ...

Page 6

TM The range of the R resistor can vary between 1K and 40K SET Ohms. The resistor in series with the rheostat will set the maximum current and should be a least 1KΩ in value fixed sink current ...

Page 7

30.5 30.4 30.3 VDD=5.5V 30.2 30.1 30 29.9 29.8 29.7 29.6 29.5 -45 -25 -5 ...

Page 8

TM LQ 16-Pin MLPQ Plastic (4x4mm EP 16-Pin PCB Land Guidelines and Thermal Pad Design 1 - 1.2mm 0.05mm minimum 0.15mm minimum gap 2.50mm Maximum 0.30mm Dia. Top View Copyright © 2001 Rev. 1.1, 10/27/2005 ...

Page 9

TM PRODUCTION DATA – Information contained in this document is proprietary to Microsemi and is current as of publication date. This document may not be modified in any way without the express written consent of Microsemi. Product processing does not ...

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