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LM3431AQ - 3-Channel Constant Current LED Driver

Download the LM3431AQ datasheet PDF. This datasheet also covers the LM3431 variant, as both devices belong to the same 3-channel constant current led driver family and are provided as variant models within a single manufacturer datasheet.

Description

The LM3431 is a 3-channel linear current controller combined with a boost switching controller ideal for driving LED backlight panels in space critical applications.

The LM3431 drives 3 external NPN transistors or MOSFETs to deliver high accuracy constant current to 3 LED strings.

Features

  • LED cathode feedback to minimize regulator headroom and optimize efficiency. A DIM input pin controls LED brightness from analog or digital control signals. Dimming frequencies up to 25 kHz are possible with a contrast ratio of 100:1. Contrast ratios greater than 1000:1 are possible at lower dimming frequencies. The LM3431 eliminates audible noise problems by maintaining constant output voltage regulation during LED dimming. Additional features include LED short and open protection, fault delay/.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (LM3431_NationalSemiconductor.pdf) that lists specifications for multiple related part numbers.

📁 Similar Datasheet

Part Number Description Manufacturer
LM3431 3-Channel Constant Current LED Driver Texas Instruments
LM3430 Boost Controller Texas Instruments
LM3432 6-Channel Current Regulator Texas Instruments
LM3432B 6-Channel Current Regulator Texas Instruments
LM3433 Common Anode Capable High Brightness LED Driver Texas Instruments

Other Datasheets by National Semiconductor (Texas Instruments)

Part Number Description
LM3431A 3-Channel Constant Current LED Driver
LM3431 3-Channel Constant Current LED Driver
LM3431Q 3-Channel Constant Current LED Driver
LM343 High Voltage Operational Amplifier
LM3430 high voltage low-side N-channel MOSFET controller

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

View original datasheet text
LM3431/LM3431A/LM3431Q/LM3431AQ 3-Channel Constant Current LED Driver with Integrated Boost Controller LM3431/LM3431A/LM3431Q/ LM3431AQ www.DataSheet4U.com March 10, 2009 3-Channel Constant Current LED Driver with Integrated Boost Controller General Description The LM3431 is a 3-channel linear current controller combined with a boost switching controller ideal for driving LED backlight panels in space critical applications. The LM3431 drives 3 external NPN transistors or MOSFETs to deliver high accuracy constant current to 3 LED strings. Output current is adjustable to drive strings in excess of 200 mA. The LM3431 can be expanded to drive as many as 6 LED strings. The boost controller drives an external NFET switch for stepup regulation from input voltages between 5V and 36V.
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