Bleeder-less, highly efficient IC family serves bulbs, tubes and fixtures

Power Integrations has announced its LYTSwitch-7 single-stage, non-isolated, TRIAC-dimmable, buck topology LED driver IC family. Capable of delivering up to 22 watts without a heatsink in a very small SO-8 footprint, these high-efficiency devices are suitable for bulbs, tubes and fixtures. The designs do not require bleeders; employing simple, passive damping for TRIAC management and an off-the-shelf, single-winding inductor, reducing component count to just 20, as compared to approximately 35 parts for typical dimmable LED driver boards.

The ICs deliver a phase-cut (TRIAC) dimming solution with a wide dimming range and monotonic dimming response. The LED drivers enable efficiency of greater than 86% - around 2% higher than conventional dimmable products – with high PF, accurate regulation and comprehensive protection. They suit low or high-line input as well as wide-range universal-input designs for US commercial lighting applications, which operate from 90VAC to 305VAC with TRIAC dimming enabled in low-line installations.

Hubertus Notohamiprodjo, director of product marketing at Power Integrations says: “Our new LYTSwitch-7 LED driver ICs provide a highly robust solution while requiring a BOM count that is approximately 40% less than conventional circuits. The internal 725 V MOSFET delivers better withstand performance during line surges, while the bleeder-less design has high TRIAC compatibility but does not produce wasted heat, resulting in a more efficient and reliable driver.”

Key applications include low-cost A19 lamps, small-form-factor lamps such as candle-style and GU10 bulbs, commercial and industrial applications, ceiling lamps and downlight fixtures.