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T8 Tube LED Drivers Set Standards In Power Density
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New LED drivers for T8 tubes offer industry-leading power densities of 14.2 W/in³, high system efficiency and a high power factor greater than 0.9.
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Friday, December 14, 2012:
Two new reference designs describing high-efficiency, non-isolated, high-power-factor (PF) LED drivers for T8 tubes have been announced by Power Integrations. The designs feature low component count and exploit simple magnetics and single-sided boards yielding industry-leading power densities of 14.2 W/in³. The circuits use single-stage non-isolated topologies, which result in a profile of only 8mm, that is small enough to be mounted behind the LEDs in the T8 tube.
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The buck-boost (DER-337) or buck (DER-345) configurations deliver a power factor greater than 0.9 and low THD, meeting EN61000-3-2 C limits. The integrated single-stage driver IC controls both PFC and constant-current output resulting in a solution that uses fewer than 30 components. Both drivers deliver 20W (85V at 240mA) at an efficiency as high as 92 per cent (DER-337) and 89 per cent (DER-345).
Andrew Smith, product marketing manager, Power Integrations, said, “The LED tube market is moving to non-isolated drivers, which boost system efficiency and reduce the temperature of the driver board and components. These boards use approximately half the number of components of isolated designs and are typically 3% – 4% more efficient. With a high PF and low THD they perfectly suit commercial and industrial lighting applications anywhere in the world.”
Upasana Dewan, EFYTIMES News Network
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