75 W Output, High Efficiency, Single Stage Flyback Power Supply With PFC for LED Ballasts

by no author specified, Power Integrations, Vendor website, Apr 01 2008

Focus:
A design based on the TOPSwitch-GX chip implements a 208-Vac to 277-Vac input, 24-V 3.125-A dc output CV/CC power supply for driving LEDs. This single-stage, flyback design operates in discontinuous conduction mode and with no input capacitance during steady-state operation so that it achieves a high power factor (>0.97 worst case). This design meets industrial requirements for a minimum power factor of 0.9.

What you’ll learn:

• How to build a power-factor-corrected, 240-Vac input, 24-V 3.125-A output CV/CC power supply for driving LEDs

Notes:
Design Idea DI-136. For more details, see Design Example Report DER-136, available online at http://www.powerint.com/sites/default/files/PDFFiles/der136.pdf.

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