LONDON – NXP Semiconductors NV (Eindhoven, The Netherlands) has announced the launch of two driver ICs in its GreenChip family for retrofit LED lamps.
The SSL21151 and SSL21153 are designed for non-dimmable 5- and 10-W LED lamps respectively, providing current control in flyback and buck-boost configurations.
The LED drivers, use primary-side sensing to regulate current, and offer LED open/short protection, an internal 700-V MOSFET, and a circuit enabling start-up directly from the rectified mains voltage.
The parts are designed for low cost but include less than 1 percent output ripple and a power factor of 0.6 which can be improved to 0.9 with the use of additional "valley-fill" circuit.
The complete LED light bulb requires 25 components and the driver ICs come in a SO7 package.
"To make LED lamps a viable replacement for incandescent light bulbs on a large scale, many manufacturers are exploring ways to bring the average selling price below the $10 mark. At the same time, the luminous efficacy of LEDs is improving steadily, requiring less power to emit more lumens,” said Ryan Zahn, general manager, lighting solutions product line at NXP Semiconductors, in a statement. "By offering a compact, low-cost solution for driving LED lamps up to 10 watts, we are broadening our portfolio of options for lighting manufacturers focused on delivering both energy savings and value to a broad customer base worldwide," he added.
Qualification samples of the GreenChip SSL21151 and SSL21153 driver ICs for high-performance non-dimmable LED applications are now available for ordering, with volume production scheduled to begin in July 2012.
From the NXP spec sheet on these: "The built-in controller uses NXP’s SOI-based ABCD smart power technology to deliver high efficiency. To support direct start-up from the rectified mains voltage, the drivers also include a high-voltage JFET, plus a 700 V power MOSFET, made in NXP’s robust SOI/EZHV process."
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