The Design of LED Tube Replacement Ballast Power Supply

Published:2012/2/9 0:27:00 Author:Li xiao na From:SeekIC

Founded in the year of 1988, Power Integrations is the leading suppliers of high voltage analog integrated circuits for energy-efficient power conversion. It is headquartered in San Jose, California. The company’s innovative technology allows compact, energy-efficient power to supply in a wide range of electronic applications, such as LED lighting, cell phone chargers, computers, LCD TVs, DVD players, set-top boxes, home appliances, telecom networking equipment, and so on.

A reference design has been introduced by this firm, which describes a 30 W LED tube replacement ballast power supply. This power supply is able to gain efficiency levels of over 90% across a wide input-voltage range while meeting worldwide requirements for power factor (PF) and total harmonic distortion (THD). LNK419EG is the base of DER-286 LED driver reference design, which is belonging to the Power Integrations’ LinkSwitch-PH family of ICs. A controller and 725V mosfet are connected by the LinkSwitch-PH devices for LED-based fluorescent-tube replacements.

Both PFC and constant-current functions are available with the LinkSwitch-PH device, so the large, temperature-sensitive electrolytic bulk capacitors will not be needed. Consequently, this device reduces the size the increases the lifetime of the power supply. The customers like to choose the convenience of single inventory item that can support installations operating from the US residential supply of 90V to 120Vac and also the high nominal voltage 277Vac services of industrial applications. The LED tubes and ballasts based on the LinkSwitch-PH device can easily meet the demands.

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