iWatt’s High PFC Digital LED Driver IC Delivers Flicker-Free Dimming for Commercial and Industrial LED Lighting
Feb 9, 2011 iWatt, Inc., a developer of energy-efficient digital power supply control integrated circuits (ICs), 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 120V/230VAC offline commercial and industrial LED lighting applications. The iW3614 (3W to 15W) is 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 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, such as the low 100Hz/120Hz line frequency ripple and resulting flicker at the output.
Comprehensive safety features include: LED open/short circuit protection, input over-voltage protection, and over-temperature thermal shutdown. An LED current de-rating at high temperatures also protects LEDs. The IC enables system designers to exceed all safety, EMI and regulatory standards, including the EN55015B, IEC61000-3-2 and Energy Star.
The chip comes in a low-cost, thermally-enhanced SO-8 package with an exposed pad which allows lower die junction-to-PCB thermal resistance for increased reliability. Samples are available, and the iW3614 is priced at $1.13 in 1,000-piece quantities.
Author: BIO T&T
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