Power Integrations Releases New LED Driver Reference Design DER-281
Power Integrations has released a new reference design (DER-281) detailing the design of a 15 W PAR38 downlight driver with up to 85% efficiency, which can be achieved without the use of unreliable high-voltage bulk electrolytic capacitors. No flicker dimming. This innovative dimming design uses the LNK405EG, one of the LinkSwitch-PH family of LED driver ICs, to be compatible with most thyristor dimmers for flicker-free dimming without sacrificing reliability and efficiency.
In the past, typical thyristor dimmers were designed for incandescent lamps, and the incandescent lamps consume an order of magnitude more power than LED lamps when the equivalent light output is achieved. The low current requirements of LED lamps (especially during dimming) can cause the thyristors to turn off or oscillate unexpectedly, creating an unpleasant flickering effect.
The early generation of LED lighting design solved this problem by storing energy in an unreliable large-capacity electrolytic capacitor, but this would have a negative impact on the life of the bulb; or let the current flow continuously into the bulb, but this would result in wasted energy, thus Attenuate the main advantages of LED lighting. The combination of the single-stage LinkSwitch-PH IC with the innovative active attenuation and bleeder circuitry used in the DER-281 eliminates these drawbacks.
According to Power Integrations, the advanced single-stage method used in the DER-281 meets the requirements of all aspects of LED designers. It is highly efficient, accurate, and meets all PFC and harmonic content standards. In addition, it has a long life and is compatible with existing home dimmers.
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