Datenblatt-Suchmaschine für elektronische Bauteile |
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LM3445M Datenblatt(PDF) 1 Page - Texas Instruments |
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LM3445M Datenblatt(HTML) 1 Page - Texas Instruments |
1 / 39 page ICOLL V+ BR1 VAC TRIAC DIMMER + + 1 2 3 4 5 6 7 8 9 10 - VLED GND VCC FLTR2 ASNS FLTR1 ISNS GATE BLDR COFF DIM LM3445MM VLED- D3 C7 C9 C10 D4 D8 D9 R2 D1 Q1 C5 R5 C12 D2 D10 Q2 L2 Q3 R3 R4 C11 C4 C3 R1 U1 VBUCK LINE VOLTAGE (VAC) 95.0 90.0 85.0 80.0 75.0 80 90 100 110 120 130 140 14 Series connected LEDs 10 Series connected LEDs LM3445 www.ti.com SNVS570L – JANUARY 2009 – REVISED MAY 2013 Triac Dimmable Offline LED Driver Check for Samples: LM3445 1 FEATURES DESCRIPTION The LM3445 is an adaptive constant off-time AC/DC 2 • Triac Dim Decoder Circuit for LED Dimming buck (step-down) constant current controller designed • Application Voltage Range 80VAC – 277VAC to be compatible with triac dimmers. The LM3445 • Capable of Controlling LED Currents Greater provides a constant current for illuminating high Than 1A power LEDs and includes a triac dim decoder. The dim decoder allows wide range LED dimming using • Adjustable Switching Frequency standard triac dimmers. The high frequency capable • Low Quiescent Current architecture allows the use of small external passive • Adaptive Programmable Off-Time Allows for components. The LM3445 includes a bleeder circuit Constant Ripple Current to ensure proper triac operation by allowing current flow while the line voltage is low to enable proper • Thermal Shutdown firing of the triac. A passive PFC circuit ensures good • No 120Hz Flicker power factor by drawing current directly from the line • Low Profile 10-Pin VSSOP Package or 14-Pin for most of the cycle, and provides a constant positive SOIC voltage to the buck regulator. Additional features include thermal shutdown, current limit and VCC • Patent Pending Drive Architecture under-voltage lockout. APPLICATIONS • Retro Fit Triac Dimming • Solid State Lighting • Industrial and Commercial Lighting • Residential Lighting Typical LM3445 LED Driver Application Circuit 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 © 2009–2013, 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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