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LM3450 Scheda tecnica(PDF) 1 Page - National Semiconductor (TI) |
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LM3450 Scheda tecnica(HTML) 1 Page - National Semiconductor (TI) |
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1 / 28 page  LM3450 November 18, 2010 LED Driver with Active Power Factor Correction and Phase Dimming Decoder General Description The LM3450 is a power factor controller (PFC) with separate phase dimming decoder. The PFC regulates an accurate out- put voltage while maintaining excellent power factor at the input. The phase dimming decoder interprets the phase angle and remaps it to a 500Hz PWM output. This combination of features is ideal for implementing a dimmable off-line LED driver for 10-100W loads. The phase dimming decoder has several unique features. A programmable mapping from input to output increases design flexibility, while a dynamic filter and variable sampling rate provide a fast, smooth response to dimmer movement. A dy- namic hold circuit ensures that the phase dimmer angle is decoded properly while minimizing the extra power losses associated with holding current. Features ■ Critical conduction mode PFC ■ Over-voltage protection ■ Feedback short circuit protection ■ 70:1 PWM decoded from phase dimmer ■ Analog dimming ■ Programmable dimming range ■ Digital angle and dimmer detection ■ Dynamic holding current ■ Smooth dimming transitions ■ Low power operation ■ Start-up pre-regulator bias ■ Precision voltage reference Applications ■ Dimmable downlights, troffers, and lowbays ■ Indoor and outdoor area SSL ■ Power supply PFC Typical Application 30127401 © 2010 National Semiconductor Corporation 301274 www.national.com |
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