A Synchronous Multioutput Step-Up/Down DC–DC Converter With Return Current Control

Author

Seol, Kyoung-Sik ; Woo, Young-Jin ; Cho, Gyu-Hyeong ; Gho, Gyu-Ha ; Lee, Jae-Woo

Author_Institution

Dept. of Electr. Eng. & Comput. Sci., Korea Adv. Inst. of Sci. & Technol. (KAIST), Daejeon

Volume

56

Issue

3

fYear

2009

fDate

3/1/2009 12:00:00 AM

Firstpage

210

Lastpage

214

Abstract

This brief presents a new return-current control method for a multioutput step-up/down dc-dc converter. Compared with prior multioutput dc-dc converters, the presently described converter can generate outputs higher or lower than the input voltage with simple control-loop compensation while guaranteeing stability in a wide load range. Using a 0.5-mum bipolar CMOS (BiCMOS) process, a converter having five outputs has been implemented for an LG active-matrix organic light-emitting diode (AM-OLED) display panel. The implemented converter operates at 1-MHz switching frequency with 4.7- muH inductor and 10-muF capacitor. Experimental results show that the proposed control method can generate tightly regulated stepped-up or -down outputs stably under a wide load variation. The conversion efficiency is higher than 80% at a typical AM-OLED panel grey level.

Keywords

CMOS integrated circuits; DC-DC power convertors; display instrumentation; electric current control; organic light emitting diodes; switching convertors; active-matrix organic light-emitting diode; bipolar CMOS process; display panel; multioutput dc-dc converters; return current control; simple control-loop compensation; switching frequency; synchronous multioutput step-down DC-DC converter; synchronous multioutput step-up DC-DC converter; Active matrix technology; BiCMOS integrated circuits; CMOS process; Current control; DC-DC power converters; Flat panel displays; Organic light emitting diodes; Stability; Switching converters; Voltage control; Active-matrix organic light-emitting diode (AM-OLED); compensation; current programmed mode (CPM); dc–dc converter; single-inductor–multiple-output (SIMO);

fLanguage

English

Journal_Title

Circuits and Systems II: Express Briefs, IEEE Transactions on

Publisher

ieee

ISSN

1549-7747

Type

jour

DOI

10.1109/TCSII.2009.2015372

Filename

4801679