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XRP7618 Datasheet(PDF) 1 Page - Exar Corporation

Part # XRP7618
Description  8-Channel Constant Current Linear LED Driver With Smart TalkTM
Download  7 Pages
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRP7618 Datasheet(HTML) 1 Page - Exar Corporation

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August 2011
Rev. 2.2.0
Exar Corporation
www.exar.com
48720 Kato Road, Fremont CA 94538, USA
Tel. +1 510 668-7000 – Fax. +1 510 668-7001
GENERAL DESCRIPTION
The XRP7618 is an 8-channel, high voltage,
constant-current sink LED driver capable of
sinking 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 is supported up to 25kHz or
through an analog signal. Featuring Exar’s
Smart TalkTM technology, when combined with
a boost converter, XRP7618 maximizes the
overall
system
efficiency
by
dynamically
reporting the minimum LED voltage necessary
to maintain current regulation mode.
STANDARD CONFIGURATION
The
XRP7618EVB
evaluation
board
is
configured to operate under the following
conditions and parameters:
Input voltage range VCC: .............................. 4.2V – 5.5V
Input voltage range VLED:....................................... <30V
Number of LED strings: .....................................16 (2x8)
LED current per string:
3 selectable pre-set levels ............. 20mA-60mA-100mA
Adj. Level .......................................... 10mA to 100mA
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ALL
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 TalkTM Power Optimization
 Parallel Operations Support
 PWM and Analog Dimming
 UVLO, Open LED & Over Temperature
protection
 20-pin TSSOP (EP) Package
EVALUATION BOARD SCHEMATICS
Fig. 1: XRP7618 Evaluation Board Schematics


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