10 MHz peak current mode dc-dc converter IC with calibrated current observer

Author

Parayandeh, Amir ; Trescases, Olivier ; Prodic, Aleksandar

Author_Institution

ECE Dept., Univ. of Toronto, Toronto, ON, Canada

fYear

2011

fDate

6-11 March 2011

Firstpage

897

Lastpage

903

Abstract

Current program mode controllers have not been widely adopted in low-power high frequency dc-dc converters due to the need for an integrated high gain-bandwidth current sensor circuit. This paper presents a peak current program mode controller IC with integrated power-stage that operates at 10 MHz and does not require any high gain-bandwidth analog circuitry in current or voltage loops. A custom bidirectional hybrid delay-line architecture emulates the inductor current based on input and output voltages. A novel calibration circuit is introduced to remove the mismatches between the actual and observed inductor current slopes. The controller consumes 210 μA when the calibration block is off and 430 μA during calibration and the peak efficiency of the converter is 87%.

Keywords

DC-DC power convertors; current-mode circuits; delay lines; mixed analogue-digital integrated circuits; calibrated current observer; calibration circuit; current program mode controllers; custom bidirectional hybrid delay-line architecture; dc-dc converter IC; frequency 10 MHz; integrated high gain-bandwidth current sensor circuit; Calibration; Converters; Delay; Electronic countermeasures; Inductors; Integrated circuits; Observers;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Power Electronics Conference and Exposition (APEC), 2011 Twenty-Sixth Annual IEEE

Conference_Location

Fort Worth, TX

ISSN

1048-2334

Print_ISBN

978-1-4244-8084-5

Type

conf

DOI

10.1109/APEC.2011.5744701

Filename

5744701