LND060 offline led driver (up to 277vac) no inductors, filters, pf>0.9, thd<25% advance d ata sheet general description ? lowest cost offline led driver (up to 277vac) ? no inductors, transformers or hv capacitors requir ed ? fewer leds required than other direct drive solutions ? up to 18w led driver solution ? high power factor >0.9 ? thd <25% ? no electrolytic capacitors ? no flicker, uniform brightness ? dimming: ? standard triac dimmer compatible ? re-organizes leds ? converts to 1khz pwm dimming to eliminate flicker at low dimming levels ? led recombination to optimize led utilization, pf and thd ? current programmability for individual segments ? over current protection ? over temperature protection with automatic restart ? power package ? up to tj=150 o c operation ? esd protected features the LND060 is designed to drive one or more strings of leds directly from an offline ac source. using a li near dimensions proprietary (patents pending) switch array, led strings can be segmented with a combinat ion of series and parallel led combinations and re- combinations. the result is an extremely high effi ciency solution with low total harmonic distortion (thd<25 %) and high power factor (>0.9). as the LND060 connects directly to the ac line and re- configures the leds to match the input voltage, it does not require magnetics, capacitors or filtering comp onents as standard led driver solutions do. this direct c oupling is also very efficient. the use of a proprietary switch array allows a larg e number of segments and re-arrangement in serial and parallel combinations. this overcomes the flicker, fanout, led utilization, low thd & poor power factor of fir st generation offline direct drive schemes. the LND060 is compatible with standard phase contro l triac dimmers. one percent (1%) dimming is accomplished using linear?s proprietary patent pend ing switch array, an on board charge pump, and an rms-t o- linear converter. when dimming the LND060 converts the phase control signal to 1khz pwm waveform to reduce flicker. applications ? solid state lighting ? led fluorescent tube replacement ? replacement lamps for 120v and 230vac ? general led lighting ? led street lamps applications diagram ? linear dimensions semiconductor inc. ? 22620 ricardo rd, cupertino ca 95014 usa ? tel 312.321.1810 ? fax 312.321.1830 ? www.lineardimensions.com ? example applications
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