Three-Way LED Bulb Driver Controller includes Power Factor Correction

O2Micro International Limited extended the its general lighting product portfolio with the introduction of the patent pending OZ2083 3-Way LED bulb driver controller with power factor correction. The OZ2083 is a buck converter controller utilizing quasi-resonant technology. The device provides two detection inputs based on proprietary technology to support 3-way, 2-circuit sockets used within 3-way desk, table, and floor lamps to produce three levels of LED brightness in a low-medium-high configuration. Using the OZ2083, manufacturers can develop drop-in LED bulb replacements for today's 3-way incandescent bulbs.

Three-way desk, table and floor lamps are ubiquitous in the United States, providing consumers with the convenience of high, medium and low brightness in a single bulb. However, today's 3-way lamps are based on energy inefficient incandescent bulbs. Furthermore, the filaments in 3-way incandescent bulbs burn out at different rates, creating reliability problems and a poor consumer experience.

LED-based, 3-way bulbs provide significant efficiency improvements versus their incandescent counterparts. In addition, they provide much longer operating life, eliminating the reliability problems that plague 3-way incandescent bulbs. According to O2Micro, until now, there has been no easy and cost effective way to design the complex driver circuitry required for a 3-way LED bulb. The OZ2083 claims to solve this problem.

The OZ2083 is a highly-optimized controller for non-isolated buck converter off-line applications. The device features the highest level of integration, reducing the system level driver bill of material (BOM) cost and component count. An external MOSFET provides the flexibility to support a range of application requirements.

The OZ2083 supports universal 85- to 265-Vac operation, enabling one LED bulb to address the global marketplace. High efficiency greater than 88% reduces energy consumption and thermal management complexity. Integrated over-temperature, over-voltage, cycle-by-cycle current limiting, LED open circuit and LED short circuit protection and maximum gate drive output clamp provide safe and reliable operation. Excellent LED current regulation ensures consistent lumen output, regardless of varying line input conditions. The OZ2083 is available in a cost effective 8-pin SOP package and is in high volume production now.