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Optoelectronics/Displays??

Optimise load dynamic performance in LED lighting app

Posted: 10 Oct 2014 ?? ?Print Version ?Bookmark and Share

Keywords:current control? CCM? APFC converters? UC3854?

Average current control with continuous conduction mode (CCM) operation is the most typical control scheme that is widely used for high power APFC converters, such as UC3854 based converter. It features several advantages over Peak current control such as the elimination of the external compensation ramp, improved immunity to noise in the sensed current signal and lower input current THD. However, the traditional CCM control scheme using the multiplier insider the chip complicates the outsider circuit design. In recent years, the new CCM with 1-D control model featuring 8-pin Solution was the most preferred by engineers, such as TI UCC28019A controller.

The UCC28019A actually takes advantage of the pulsed and non-linear nature of switching converters and achieves instantaneous control of the average value of the rectified voltage or current. This control scheme was designed to provide fast dynamic load response and good input perturbation rejection compared to the other PFC controllers.

View the PDF document for more information.

Originally published by Texas Instruments Inc. at www.ti.com as "The Solution to Optimise the Load Dynamic Performance in UCC28019A LED Lighting Application".





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