Low Cost Dimmable LED Ballast Using the Valley Fill Current Shaping Circuit

Focus:

Based on the LNK306PN LinkSwitch-TN chip, a 120-Vac input 70-V 130-mA output constant-current power supply drives LEDs and is dimmable using standard Triacs. Design uses a passive valley-fill PFC circuit to achieve a power factor greater than 0.92 for compliance with Energy Star solid-state lighting (SSL) requirements for commercial applications.

What you’ll learn:

• How to build a 9-W 70-V output, 120-VAC input, nonisolated power supply for driving LEDs
• How to build a dimmable, power factor corrected 9-W power supply for driving LEDs

Notes:

Design Idea DI-171. Design meets Energy Star requirement forsolid-state lighting (SSL) luminaires.

View the Source

Author & Publication:

no author specified, Power Integrations, Vendor website, Mar 01 2008

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