Power Integrations' new LED driver reference design DER-286 describes a 30 W LED tube-replacement ballast power supply capable of achieving efficiency levels of over 90% across a wide input-voltage range. The design meets worldwide requirements for power factor (PF) and total harmonic distortion (THD).
The DER-286 LED driver reference design is based on the LNK419EG, a member of Power Integrations’ LinkSwitch-PH family of ICs. LinkSwitch-PH devices combine a controller and 725 V MOSFET to dramatically reduce the complexity and component count of the design, making it ideal for the increasingly cost-sensitive market for LED-based fluorescent-tube replacements. The LinkSwitch-PH device performs both PFC and constant-current functions in an advanced single-stage topology, eliminating the need for large, temperature-sensitive electrolytic bulk capacitors, which in turn reduces the size and increases the lifetime of the power supply.
A single inventory item that can support installations operating from the U.S. residential supply of 90 VAC to 120 VAC and also the high nominal voltage 277 VAC services of industrial applications is easy to achieve using LED tubes and ballasts based on the LinkSwitch-PHdevice. EISA regulations due to be implemented in 2012 advance the minimum luminous efficacy of fluorescent tubes, severely challenging the large T12 type and serving notice on T8 and T5 tubes with inefficient older ballasts. LED luminaires based on the LinkSwitch-PH ICs, such as DER-286, are an efficient, cost-effective and reliable replacement technology, according to the company.
DER-286 is available here .