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LM3407 数据表(PDF) 8 Page - Texas Instruments |
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LM3407 数据表(HTML) 8 Page - Texas Instruments |
8 / 22 page VIN LX + - 198mV + - Clock Generator PWM Comparator DIM GND ISNS + - 3.6V UVLO FS SWITCH CONTROL + - EA gm Reset 6 Set Slope Compensation Waveform shaping and Average Current Sense VCC regulator VCC EN 3.6V VIN 3.6V DIM VCC SD 400 k: SD DIM 5 PA Q1 LM3407 SNVS553B – JANUARY 2008 – REVISED MAY 2013 www.ti.com SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM FUNCTIONAL DESCRIPTION OVERVIEW The LM3407 is a constant current output floating buck switching converter with wide input voltage range and low feedback current sense reference voltage. These characteristics make the LM3407 an efficient solution to provide constant current to high power LEDs. The device is ideal for automotive, industrial and general lighting applications where high power LEDs are used as the lighting source. The LM3407 has an integrated power N- MOSFET that makes the application solution compact and simple to implement. An external 1% thick-film resistor allows the converter output voltage to adjust as needed to deliver constant current within 10% accuracy to a serially connected LED string of varying number and type. Converter switching frequency is adjustable from 300 kHz to 1 MHz. The LM3407 features a dimming input to enable LED brightness control by Pulse Width Modulation (PWM). Additionally, a separate enable pin allows for low power shutdown. An exposed pad MSOP-8 PowerPAD package provides excellent heat dissipation and thermal performance. Input UVLO and output open- circuit protection ensure a robust LED driver solution. FLOATING BUCK SWITCHING CONVERTER The LM3407 is designed for floating buck configuration. Different from conventional buck converters, a low side power N-MOSFET is used. The floating buck configuration simplifies the driver stage design and reduces the die size of the power MOSFET. Additionally, the connections of the power diode, inductor and output capacitor are switched to ground with a ground referenced power switch, Q1. The extraction of inductor current information can be easily realized by a simple current sensing resistor. These benefits combine to provide a high efficiency, low cost, and reliable solution for LED lighting applications. 8 Submit Documentation Feedback Copyright © 2008–2013, Texas Instruments Incorporated Product Folder Links: LM3407 |
类似零件编号 - LM3407 |
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类似说明 - LM3407 |
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