Non-isolated AC/DC LED driver design with TPS92314A

The control principle of the TPS92310/11/12/14 is to provide constant current line and load regulation for primary-side sensing flyback configurations operating in critical conduction mode (CRM), removing the opto-coupler used for secondary-side feedback.

The new application circuit uses a single inductor rather than a bulky transformer, saving board space and BOM cost while still meeting the standard performance specifications of an LED driver.

This application report describes how to design a non-isolated AC/DC buck LED driver with an integrated PFC control using the TPS92314A from Texas Instruments. This application report includes schematics, switch node waveforms and test results to help the user better understand how to retain a very tight line and load regulation when applying the IC as a buck regulator with the help of external add-on circuitry that modifies the control equation of the TPS92314A. In this way, tighter line and load regulation specifications required by certain applications can be met.

View the PDF document for more information.

Originally published by Texas Instruments Inc. at www.ti.com as "Low Cost, Single Inductor Non-Isolated AC/DC LED Driver Design using TPS92314A".