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LM3431-Q1 Datenblatt(PDF) 1 Page - Texas Instruments

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Teilenummer LM3431-Q1
Bauteilbeschribung  3-Channel Constant Current LED Driver with Integrated Boost Controller
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Hersteller  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
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LM3431
www.ti.com
SNVS547F – NOVEMBER 2007 – REVISED MARCH 2009
LM3431/LM3431A/LM3431Q/LM3431AQ 3-Channel Constant Current LED Driver with
Integrated Boost Controller
Check for Samples: LM3431
1
FEATURES
DESCRIPTION
The LM3431 is a 3-channel linear current controller
2
LM3431Q/LM3431AQ are Automotive Grade
combined with a boost switching controller ideal for
Products that are AEC-Q100 Grade 1 Qualified
driving
LED
backlight
panels
in
space
critical
(–40°C to 125°C operating junction
applications. The LM3431 drives 3 external NPN
temperature)
transistors or MOSFETs to deliver high accuracy
3-Channel Programmable LED Current
constant current to 3 LED strings. Output current is
adjustable to drive strings in excess of 200 mA. The
High Accuracy Linear Current Regulation
LM3431 can be expanded to drive as many as 6 LED
Analog and Digital PWM Dimming Control
strings.
Up to 25kHz Dimming Frequency
The boost controller drives an external NFET switch
>100:1 Contrast Ratio
for step-up regulation from input voltages between 5V
Integrated Boost Controller
and
36V.
The
LM3431
features
LED
cathode
feedback
to
minimize
regulator
headroom
and
5V-36V Input Voltage Range
optimize efficiency.
Adjustable Switching Frequency up to 1MHz
A DIM input pin controls LED brightness from analog
LED Short and Open Protection
or digital control signals. Dimming frequencies up to
Selectable Fault Shutdown or Automatic
25 kHz are possible with a contrast ratio of 100:1.
Restart
Contrast ratios greater than 1000:1 are possible at
Programmable Fault Delay
lower dimming frequencies.
Programmable Cycle by Cycle Current Limit
The LM3431 eliminates audible noise problems by
Output Over Voltage Protection
maintaining constant output voltage regulation during
LED dimming. Additional features include LED short
No Audible Noise
and open protection, fault delay/error flag, cycle by
Enable Pin
cycle current limit, and thermal shutdown for both the
LED Over-Temperature Shutdown Input
IC and LED array. The enhanced LM3431A features
reduced offset voltage for higher accuracy LED
Thermal Shutdown
current.
TSSOP-28 Exposed Pad Package
APPLICATIONS
Automotive Infotainment Displays
Small to Medium Format Displays
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2007–2009, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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