Datenblatt-Suchmaschine für elektronische Bauteile |
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LM3405 Datenblatt(PDF) 1 Page - Texas Instruments |
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LM3405 Datenblatt(HTML) 1 Page - Texas Instruments |
1 / 29 page LM3405 VIN VIN EN/DIM BOOST SW FB GND C3 L1 C2 R1 D1 D2 C1 IF ON OFF C4 VOUT LM3405 www.ti.com SNVS429B – OCTOBER 2006 – REVISED MAY 2013 LM3405 1.6MHz, 1A Constant Current Buck Regulator for Powering LEDs Check for Samples: LM3405 1 FEATURES DESCRIPTION Integrated with a 1A power switch, the LM3405 is a 2 • VIN Operating Range of 3V to 15V current-mode control switching buck regulator • Thin SOT-6 Package designed to provide a simple, high efficiency solution • 1.6MHz Switching Frequency for driving high power LEDs. With a 0.205V reference voltage feedback control to minimize power • 300m Ω NMOS Switch dissipation, an external resistor sets the current as • 40nA Shutdown Current at VIN = 5V needed for driving various types of LEDs. Switching • EN/DIM Input for Enabling and PWM Dimming frequency is internally set to 1.6MHz, allowing small of LEDs surface mount inductors and capacitors to be used. The LM3405 utilizes current-mode control and • Internally Compensated Current-mode Control internal compensation offering ease of use and • Cycle-by-cycle Current Limit predictable, high performance regulation over a wide • Input Voltage UVLO range of operating conditions. Additional features include user accessible EN/DIM pin for enabling and • Over-current Protection PWM dimming of LEDs, thermal shutdown, cycle-by- • Thermal Shutdown cycle current limit and over-current protection. APPLICATIONS • LED Driver • Constant Current Source • Industrial Lighting • LED Flashlights TYPICAL APPLICATION CIRCUIT Efficiency vs LED Current (VIN = 5V) 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 © 2006–2013, 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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