LED driver ICs set efficiency standard in bulbs, tubes and ballasts
Single-stage, non-isolated, buck topology LED driver ICs in the LYTSwitch-1 family have a compact footprint, says Power Integrations, and enable the design of LED bulbs and tubes with high constant-current accuracy while using a minimum number of components.
A driver algorithm ensures high power factor (PF) and low total harmonic distortion (THD) while maintaining efficiency, says the company. Housed in a compact SO-8 package, the ICs are greater than 93% efficient with a PF of over 0.9 and THD as low as 15%. Devices can be used in a low-side buck topology for reduced EMI or in a high-side buck topology to simplify design. Delivering up to 22W without a heatsink, and a universal input of 100 to 308V AC, the ICs incorporate a 725V MOSFET for reliability. Thanks to a peak current control algorithm, small, off-the-shelf inductors can be used.
The ICs meet international standards including: DOE 6 (external power supply), CEC Title 20 and 24, ENERGY STAR® SSL, EN61000-3-2 (C) plus China and India standards.
The low component count and compact size make these LED driver ICs easy to fit into space-challenged applications such as tube end caps, small form factor candles and GU10 bulbs, as well as low cost A19 and decorative-filament lamps.
Protection features include thermal foldback with end-stop shutdown, short circuit protection, input and output over-voltage, overcurrent and safe operating area protection.
Samples are available now.