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Non-isolated AC/DC LED driver design with TPS92314A

Posted: 11 Nov 2014     Print Version  Bookmark and Share

Keywords:TPS92310/11/12/14  load regulation  critical conduction mode  LED driver  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 as "Low Cost, Single Inductor Non-Isolated AC/DC LED Driver Design using TPS92314A".

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