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LM3405AXMK 数据表(PDF) 1 Page - Texas Instruments |
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LM3405AXMK 数据表(HTML) 1 Page - Texas Instruments |
1 / 32 page LM3405A VIN VIN EN/DIM BOOST SW FB GND C3 L1 C2 R1 D1 C1 IF ON OFF C4 VOUT D2 D3 LM3405A www.ti.com SNVS508C – OCTOBER 2007 – REVISED MAY 2013 LM3405A 1.6MHz, 1A Constant Current Buck LED Driver with Internal Compensation in Tiny SOT and VSSOP PowerPAD Packages Check for Samples: LM3405A 1 FEATURES DESCRIPTION The LM3405A is a 1A constant current buck LED 2 • VIN Operating Range of 3V to 22V driver designed to provide a simple, high efficiency • Drives up to 5 High-Brightness LEDs in Series solution for driving high power LEDs. With a 0.205V at 1A reference voltage feedback control to minimize power • Thin SOT-6 package and VSSOP-8 PowerPAD dissipation, an external resistor sets the current as needed for driving various types of LEDs. Switching Packages frequency is internally set to 1.6MHz, allowing small • 1.6MHz Switching Frequency surface mount inductors and capacitors to be used. • EN/DIM Input for Enabling and PWM Dimming The LM3405A utilizes current-mode control and of LEDs internal compensation offering ease of use and predictable, high performance regulation over a wide • 300m Ω NMOS Switch range of operating conditions. With a maximum input • 40nA Shutdown Current at VIN = 5V voltage of 22V, it can drive up to 5 High-Brightness • Internally Compensated Current-mode Control LEDs in series at 1A forward current, with the single • Cycle-by-cycle Current Limit LED forward voltage of approximately 3.7V. Additional features include user accessible EN/DIM • Input Voltage UVLO pin for enabling and PWM dimming of LEDs, thermal • Over-current Protection shutdown, cycle-by-cycle current limit and over- • Thermal Shutdown current protection. APPLICATIONS • LED Driver • Constant Current Source • Industrial Lighting • LED Flashlights • LED Lightbulbs TYPICAL APPLICATION CIRCUIT Efficiency vs LED Current (VIN = 12V) 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 © 2007–2013, 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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类似说明 - LM3405AXMK |
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