The DER-281 reference design features an 85%-efficient, 15-W PAR38 downlight driver that delivers flicker-free dimming without the use of unreliable high-voltage electrolytic bulk capacitors. Based on LNK405EG, a member of the company’s popular LinkSwitch-PH family of LED driver ICs, the design’s novel approach to dimming eliminates the need to sacrifice reliability and efficiency in order to achieve flicker-free performance across a broad range of TRIAC dimmers.
The low current requirement of LED lights, especially when dimmed, can cause TRIACs to switch off unexpectedly or oscillate, creating an annoying flickering effect. Early-generation LED lighting designs addressed this problem either by storing energy in an unreliable electrolytic bulk capacitor, adversely affecting bulb lifetime, or by allowing a continuous flow of current into the bulb, wasting energy and thereby defeating the main benefit of LED lighting. Single-stage LinkSwitch-PH ICs, combined with the innovative active damping and bleeding circuitry employed in DER-281, eliminate these pitfalls, providing flicker-free dimming with high efficiency and long lifetime.(Contact company for pricing and availability)
By Christina Nickolas
Power Integrations , San Jose , CA
Sales 408-414-9200
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