LYTSwitch-1 LED driver IC, high power factor (PF), low THD

Power Integrations announced the LYTSwitch™-1 family of single-stage, non-isolated, buck topology LED driver ICs.

Featuring a small size, this IC enables the design of LED bulbs and tubes with high constant current accuracy while using a minimal number of components. Furthermore, a novel driver algorithm ensures high power factor (PF) and low total harmonic distortion (THD) while maintaining very high efficiency.

Available in a compact SO-8 package, the LYTSwitch-1 IC delivers efficiencies exceeding 93% with a PF greater than 0.9 and a THD as low as 15%. The device can be used in a low-side buck topology for EMI reduction or in a high-side buck topology for design simplicity. Delivering up to 22 W of power without a heatsink, this universal input (100-308 VAC) IC incorporates a 725 V MOSFET for high reliability. A unique peak current control algorithm allows designers to use small, off-the-shelf inductors. The new device meets all applicable international standards, including:


“The low system complexity and high performance of LYTSwitch-1 ICs make them ideal for commercial and residential lighting applications,” said Hubie Notohamiprodjo, director of product marketing at Power Integrations. “Featuring a low component count and small size, the LED driver IC can be easily applied to space-constrained applications such as tube end caps, small form factor candle bulbs, GU10 bulbs, as well as low-cost A19 and decorative filament lamps,” he said.

Like all Power Integrations products, LYTSwitch-1LED driver ICs have protection features including thermal foldback with end-stop shutdown, short-circuit protection, input and output OVP, overcurrent, and SOA protection.

LYTSwitch-1 IC samples are available now. Device pricing starts at $0.26 in 10,000-unit quantities. Reference design DER-548 can be downloaded from the Power Integrations website (https://www.power.com/lytswitch-1).