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LED driver with PFC, phase dimming decoder

Posted: 16 Dec 2010 ?? ?Print Version ?Bookmark and Share

Keywords:National Semiconductors? LM3450? power factor controller? phase dimming decoder?

National Semiconductors' LM3450 is a power factor controller (PFC) with separate phase dimming decoder. The PFC regulates an accurate output 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 dynamic

hold circuit ensures that the phase dimmer angle is decoded properly while minimizing the extra power losses associated with holding current.

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