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Analysis of start-up performance for UCC28700

Posted: 22 Oct 2014     Print Version  Bookmark and Share

Keywords:UCC28700  power supply controller  current regulation  capacitor  low-power adapter 

The UCC28700 device is a primary controlled fly-back power supply controller, which provides both constant voltage and constant current regulation. The device has high resolution for voltage and current regulation, and it has very low no-load power consumption and good start-up performance. As a result, the UCC28700 device is highly suited for low-power adapter and auxiliary power supply application. Compared with other competitors, the UCC28700 device has better performance and needs a smaller VDD capacitor. A customer may experience a situation in which the UCC28700 device cannot start a constant current full load, but can start at resistance full load. The real reason is that the value of the VDD capacitor is not sufficient and primary peak current is designed too small. This paper analyses the design of primary peak current and VDD capacitor. An experiment result validates the theoretical analysis.

View the PDF document for more information.

Originally published by Texas Instruments Inc. at www.ti.com as "Analysis of Start-Up Performance for UCC28700".





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