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XRP7618

Description
8-Channel Constant Current Linear LED Driver With Smart TalkTM
File Size617KB,10 Pages
ManufacturerExar
Download Datasheet View All

XRP7618 Overview

8-Channel Constant Current Linear LED Driver With Smart TalkTM

X RP 7 6 1 8
8-Channel Constant Current Linear LED Driver With
Smart Talk
TM
July 2011
Rev. 1.0.0
GENERAL DESCRIPTION
The XRP7618 is an 8-channel, high voltage,
constant-current sink LED driver capable of
driving up to 100mA current per channel. With
outputs rated at 30V, the XRP7618 can control
strings of multiple LEDs with better than
±1.5% channel to channel current matching.
LED channel current is programmed via an
external resistor within a 10mA to 100mA
range. Dimming control is supported through a
standard PWM scheme up to 25kHz or through
an analog signal.
technology,
Featuring Exar’s Smart Talk
when combined with a boost converter, the
XRP7618 maximizes the overall system
efficiency by dynamically reporting the
minimum LED voltage necessary to maintain
current regulation mode. Multiple channels can
be combined to increase current driving
capability per channel and multiple XRP7618s
can be placed in parallel to drive over 8 strings
of LEDs.
An under voltage lock out, open LED and over
temperature protections insure safe operations
under abnormal operating conditions.
The XRP7618 is available in RoHS compliant,
“green”/halogen free space saving 20-pin
TSSOP (EP) package.
TM
APPLICATIONS
LCD Backlighting
Desktop, Notebook and TV Displays
Industrial and Medical Displays
Signage Backlighting
FEATURES
8 Constant-Current Channels
Adjustable up to 100mA per Channel
Channel Paralleling for higher Current
±1.5% Current Matching Accuracy
Up to 30V LED Channel Voltage Range
5V Biasing Voltage and Control
Smart Talk
TM
Power Optimization
Parallel Operations Support
PWM and Analog Dimming
UVLO, Open LED & Over Temperature
protection
RoHS Compliant Halogen Free,
20-pin TSSOP (EP) Package
TYPICAL APPLICATION DIAGRAM
Fig. 1: XRP7618 Typical Application Diagram
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. +1 510 668-7000 – Fax. +1 510 668-7001
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