A new current-mode control for DC/DC converter
Conference: Intelec '05 - Telecommunications Conference - 27th International Telecommunication Energy Conference
09/18/2005 - 09/22/2005 at Berlin, Germany
Proceedings: Intelec '05 - Telecommunications Conference
Pages: 6Language: englishTyp: PDF
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Authors:
Di Blasi, Giuseppe Maria; Livreri, Patrizia; Capponi, Giuseppe (Università di Palermo, Italy)
Marino, Filippo (STMicroelectronics - Industrial & Power Conversion (I&PC), Catania Site, Italy)
Abstract:
Current-sensing is used widely in smart power chips, especially in DC/DC converter for voltage regulator modules (VRM), implemented with interleaved synchronous rectifier buck converters. The interleaved technique main difficulty is due to its current-sharing control between the several modules. Besides, if the used control technique is current-mode type, it is necessary create a ramp signal proportional to current on the inductor. In this paper, a lossless current-sensing method, solving the major disadvantages of the current-mode control and implementing a current-sharing technique, is proposed. This innovative technique is tested in a two-module interleaved buck converter.