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LM3431 数据表(PDF) 1 Page - Texas Instruments |
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LM3431 数据表(HTML) 1 Page - Texas Instruments |
1 / 36 page 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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类似说明 - LM3431 |
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