LED-driver reference design for T8-tube replacement touts desirable density

摘要

Power Integrations announced two new reference designs describing high-efficiency, non-isolated, high power-factor (PF) LED drivers for T8 tubes. The designs feature low component count and leverage simple magnetics and single-sided boards yielding power densities of 14.2 W/in3. Based on the LNK460KG LED driver from the company's LinkSwitch-PL family of ICs, the circuits detailed in DER-337 (high-line) and DER-345 (low-line) use single-stage, non-isolated topologies which result in a profile of 8 mm - small enough to be mounted behind the LEDs in the T8 tube.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.