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LM3445 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM3445 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 26 page  LM3445 September 22, 2010 Triac Dimmable Offline LED Driver General Description The LM3445 is an adaptive constant off-time AC/DC buck (step-down) constant current controller designed to be com- patible with triac dimmers. The LM3445 provides a constant current for illuminating high power LEDs and includes a triac dim decoder. The dim decoder allows wide range LED dim- ming using standard triac dimmers. The high frequency ca- pable architecture allows the use of small external passive components. The LM3445 includes a bleeder circuit to ensure proper triac operation by allowing current flow while the line voltage is low to enable proper firing of the triac. A passive PFC circuit ensures good power factor by drawing current di- rectly from the line for most of the cycle, and provides a constant positive voltage to the buck regulator. Additional features include thermal shutdown, current limit and V CC un- der-voltage lockout. Features ■ Triac dim decoder circuit for LED dimming ■ Application voltage range 80V AC – 277VAC ■ Capable of controlling LED currents greater than 1A ■ Adjustable switching frequency ■ Low quiescent current ■ Adaptive programmable off-time allows for constant ripple current ■ Thermal shutdown ■ No 120Hz flicker ■ Low profile 10 pin MSOP Package or 14 pin SOIC ■ Patent pending drive architecture Applications ■ Retro Fit Triac Dimming ■ Solid State Lighting ■ Industrial and Commercial Lighting ■ Residential Lighting Typical LM3445 LED Driver Application Circuit 30060301 30060305 © 2010 National Semiconductor Corporation 300603 www.national.com |
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