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PDF XRP7618 Data sheet ( Hoja de datos )
| Número de pieza | XRP7618 | |
| Descripción | 8-Channel Constant Current Linear LED Driver | |
| Fabricantes | Exar | |
| Logotipo |  |
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July 2011
XRP7618
8-Channel Constant Current Linear LED Driver With
Smart TalkTM
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.
Featuring Exar’s Smart TalkTM technology,
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.
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 TalkTM Power Optimization
Parallel Operations Support
PWM and Analog Dimming
UVLO, Open LED & Over Temperature
www.DataSheet.net/
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
Datasheet pdf - http://www.DataSheet4U.co.kr/
1 page  
XRP7618
8-Channel Constant Current Linear LED Driver With
Smart TalkTM
TYPICAL PERFORMANCE CHARACTERISTICS
All data taken at VCC = 5V, RISET = 8kΩ, TA = 25°C, unless otherwise specified - Schematic and BOM from Application
Information section of this datasheet.
Fig. 4: Current per Channel vs Temperature
20
18
16
14
12
10
8
6
4
2
0
0
1kHz
100Hz
25kHz
20 40 60 80 100
Duty cycle (%)
Fig. 5: PWM Dimming: Current per Channel vs Duty Cycle
59 59
58
57
58
www.DataSheet.net/
57
56
4
4.2 4.4 4.6 4.8
5
Input Voltage (V)
5.2 5.4 5.6
Fig. 6: Current per Channel vs Input Voltage
56
0.5
1.0 1.5 2.0 2.5
Voltage per channel (V)
3.0
Fig. 7: Current per Channel vs Voltage per Channel
Fig. 8: Maximum Output Current vs Voltage per Channel
100
90
80
70
60
50
40
30
20
10
0
10 20
Rset (kΩ)
30
40
Fig. 9: Current per Channel vs RSET resistor
© 2011 Exar Corporation
5/10
Rev. 1.0.0
Datasheet pdf - http://www.DataSheet4U.co.kr/
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet XRP7618.PDF ] | |
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