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LED driver reference design for T8 tube

Posted: 06 Dec 2012 ?? ?Print Version ?Bookmark and Share

Keywords:Power Integrations? LED driver reference design? T8 tube? LNK460KG? LinkSwitch?

Power Integrations has revealed a couple of reference designs describing high-efficiency, non-isolated, high-power-factor LED drivers for T8 tubes.

According to the company, the designs feature low component count and leverage simple magnetics and single-sided boards yielding industry-leading power densities of 14.2 W/in3.

Based on the LNK460KG LED driver from Power Integrations' LinkSwitch-PL family of ICs, the circuits detailed in DER-337 (high-line) and DER-345 (low-line) use single-stage non-isolated topologies that result in a profile of only 8mm, small enough to be mounted behind the LEDs in the T8 tube.

T-8 tube

T8-tube. Reference designs describe high-efficiency, non-isolated, high-power-factor LED drivers.

Img caption T8-tube reference designs describing high-efficiency, non-isolated, high-power-factor (PF) LED drivers.

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 designs are EMI compliant, easily meeting the EN55015 (EMI) class B specification. 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), the company indicated.

Download DER-337 at http://www.powerint.com/sites/default/files/PDFFiles/der337.pdf; DER-345 at http://www.powerint.com/sites/default/files/PDFFiles/der345.pdf.





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