Digital LED Driver IC Delivers Flicker-Free Dimming for Commercial, Industrial Apps
Wed, 02/09/2011 - 9:57am
iWatt, Inc. expanded its family of digital LED driver ICs with a two-stage, power-factor-corrected (PFC), primary-side-regulated, leading- and trailing-edge-dimmable, AC/DC Digital PWM Controller targeting 120 V/230 VAC offline commercial and industrial LED lighting applications. Designed for isolated or non-isolated LED drivers used in incandescent replacement lamps including both space-constrained (GU10, MR16) and larger (A, PAR) types, the iW3614 (3 W to 15 W) incorporates features to assure power efficiency, durability and flicker-free compatibility with existing wall dimmers worldwide. The iW3614 features a two-stage PFC scheme on a single chip. A front-stage boost converter enables PF > 0.90 (typically 0.94), while the following PWM driver stage minimizes ripple current at the output. This scheme eliminates the disadvantages of a single-stage design. Reducing the output ripple current also enables smaller output capacitors.