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LM3492-Q1 データシート(PDF) 1 Page - Texas Instruments |
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LM3492-Q1 データシート(HTML) 1 Page - Texas Instruments |
1 / 24 page LM3492, LM3492Q www.ti.com SNVS656C – SEPTEMBER 2010 – REVISED MAY 2013 Two-Channel Individual Dimmable LED Driver with Boost Converter and Fast Current Regulator Check for Samples: LM3492, LM3492Q 1 FEATURES 2 • Boost Converter: – COMM I/O pin for diagnostic and commands – LM3492Q is an Automotive Grade Product that is AEC Q100 Grade 1 Qualified – Thermal shutdown protection – Very Wide Input Voltage Ranged from 4.5V- – Thermally enhanced 20-Pin HTSSOP 65V package – Programmable Soft-start APPLICATIONS – No Loop Compensation Required • Ultra-high contrast ratio 6.5”-10” LCD display – Stable with Ceramic and Other low ESR backlight up to 28 LEDs Capacitors with no Audible Noise • Automotive or marine GPS display – Nearly Constant Switching Frequency Programmable from 200 kHz to 1 MHz DESCRIPTION • Current Regulators: The LM3492 integrates a boost converter and a two- – Programmable LED Current from 50 mA to channel current regulator to implement a high efficient 200 mA and cost effective LED driver for driving two – 1000:1 Contrast Ratio at a Dimming individually dimmable LED strings with a maximum power of 15W and an output voltage of up to 65V. Frequency of more than 3 kHz, Minimum The boost converter employs a proprietary Projected- LED Current Pulse width is 300 ns On-Time control method to give a fast transient – Two Individual Dimmable LED strings up to response with no compensation required, and a 65V, total 15W (typically 28 LEDs at 150 nearly constant switching frequency programmable mA) from 200 kHz to 1 MHz. The application circuit is – Dynamic Headroom Control maximizes stable with ceramic capacitors and produces no audible noise on dimming. The programmable peak efficiency current limit and soft-start features reduce current – Over-Power protection surges at startup, and an integrated 190 m Ω, 3.9A N- – ±3% current accuracy Channel MOSFET switch minimizes the solution size. • Supervisory Functions: – Precision enable TYPICAL APPLICATION 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 © 2010–2013, 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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