National Semiconductor Introduces LED Driver with Industry’s Best Dimming Performance
Dec 1, 2010 National Semiconductor Corp. has introduced a new LED driver with the industry’s best phase-based dimming performance for high-brightness light-emitting diode (LED) applications. The LM3450 LED driver integrates active power factor correction (PFC) and phase dimming decoding to provide uniform, flicker-free illumination across a wide, programmable dimming range. A member of National’s PowerWise energy-efficient product family, the LM3450 is well-suited for use in high-performance, phase dimmable, 10 Watt to 100 Watt LED fixtures.
Technical Features of National’s LM3450 Controller
The LM3450 LED driver regulates an accurate output while maintaining excellent power factor at the input. The integrated phase dimming decoder interprets the phase angle and remaps it to a 500 Hz PWM output to dim the LEDs. This combination of features is ideal for implementing a phase dimmable off-line LED driver for 10 Watt to 100 Watt loads.
Other benefits include an analog adjust input to allow for differentiation such as thermal foldback, interface to sensors or dimmer range adjustability.
The LM3450 can be implemented in either single stage or two stage configurations. The single stage configuration yields the smallest footprint and allows for the highest efficiency when converting from the AC mains voltage. The two stage configuration provides improved dimming performance and better noise immunity.
Offered in a 16-pin TSSOP package, National’s LM3450 is available now and priced at $1.85 in 1,000-unit quantities.
Author: BIO T&T
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