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January 11, 2013
14.2 W/in3 Power Density in T8-Tube LED-Driver Reference Design Offered by PI
Reference designs DER-337 (high-line) and DER-345 (low line) from Power Integrations, Inc. describe high-efficiency, non-isolated, LED drivers for T8 tubes that use approximately half the number of components of isolated designs (fewer than 30), and are typically 3-4 % more efficient. And, with Power Factors exceeding 0.95 and low THD, they are targeted for commercial and industrial lighting applications anywhere in the world.
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Featuring small size, high efficiency and long-lifetime, these reference designs are especially well-suited for retrofit tube applications. In addition, the designs support the trend toward non-isolated drivers in the LED tube market. The use of non-isolated drivers boosts system efficiency and reduces the temperature of the driver board and components.
Based on the LNK460KG LED driver from Power Integrations' LinkSwitch-PL family of ICs, the circuits detailed in DER-337 and DER-345 feature single-stage non-isolated topologies, which result in a profile of only 8 mm - small enough to be mounted behind the LEDs in the T8 tube. These designs leverage simple magnetics and single-sided boards, yielding industry-leading power densities of 14.2 W/in³.
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