NXP Semiconductors recently announced three developments in its portfolio of mains-connected LED driver solutions: the success of its SSL2101 LED driver IC in matching LED lifetimes in an accelerated lifetime test; the introduction of the SSL 2102 integrated dimmable mains LED driver IC for SSL retrofit lamps and modules; and the launch of its online design tool for SSL applications, which makes it easy for engineers to test the behaviour of LED lighting applications based on four NXP products.
Lifetime testing for LED driver ICs
NXP has been conducting what it says is the industry’s longest-running test of LED driver ICs, running continuously since December 2008, with zero failures. As of today, the test has reached 7000 hours and continues to run, demonstrating that NXP mains LED controller and driver ICs are capable of matching LED lifetimes. The test goes well beyond traditional lifetime testing procedures in the semiconductor industry, which are typically based on 1000 hours’ testing time.
NXP’s ongoing lifetime test is focused on the SSL2101, a dimmable mains LED driver IC. NXP tested a random lot of SSL2101 IC drivers from standard production in high-stress conditions, all of which remain fully functional after running for over 7000 hours with an IC junction temperature of 150°C. Multiple tests and setups were used to detect all possible failure modes in several use cases: continuous-on, on/off switching cycle and various combinations. The extrapolated lifetime of the SSL2101 in real lighting applications, based on a lifetime acceleration model, is estimated as follows:
* Over 60 000 hours lifetime at 105°C.
* Over 35 000 hours lifetime at 115°C.
* Over 20 000 hours at 125°C.
* Over 7 000 hours at 150°C.
Newest LED integrated driver IC supports up to 25 W
The SSL2102 is the latest addition to NXP’s lighting portfolio, offering deep dimming down to 1% of full light intensity, as well as compatibility with a wide range of dimmers. The small, highly integrated and efficient driver is designed for SSL retrofit LED lighting, and is suited to small form-factor applications with closed casings.
The SSL2102 is suitable for high-efficiency and high power factor SSL applications, including SSL retrofit lamps from 8 W to 15 W; LED modules such as LED spots and down-lights from 15 W to 25 W; and LED strings for retail display up to a maximum of 25 W.
Online design tool for SSL applications
NXP’s new online design tool for SSL applications makes it easy for engineers to evaluate and test the behaviour of LED lighting applications based on four NXP products, including the new SSL2102 and SSL2101 for dimmable applications, as well as the SSL1522 and SSL1523 for non-dimmable applications.
The tool enables engineers to quickly select the IC they need and test designs for LED drivers from 2 W up to 25 W. Two different application types can be created: isolated (flyback) and non-isolated (buck) converters. The tool generates schematic, component and transformer parameters, calculates the design’s efficiency and presents an overview of efficiency losses. Applications include SSL retrofit lamps, LED modules and power supplies, LED strings, LED ballasts, contour lighting, channel letter lighting and other LED lighting applications.
For more information contact Stuart Hanford, Arrow Altech Distribution, +27 (0)11 923 9600, [email protected], www.arrow.altech.co.za
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