A new single inductor bipolar multiple output (SIBMO) boost converter using pulse frequency modulation (PFM) control for OLED drivers and optical transducers

Chun Kai Chang, Chung Hsin Su, Yung Hua Kao, Ming Hung Yu, Thilo Sauter, Chang-Po Chao

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

This study proposes a single-inductor bipolar multiple-output (SIBMO) boost converter utilizing pulse frequency (PFM) control for organic light-emitting diode (OLED) drivers and optical transducers. The purpose of the converter designed herein is to provide multiple voltage sources with opposite polarities to meet the requirements of various applications such as OLEDs or optical transducers. The bipolar voltage sources are essential for offering alternating driving voltages to extend the lifetime of OLEDs. The converter boosts the input of 2.8 V to two positive and two negative outputs, i.e., +12 V, +6 V,-12 V, and-6 V. Different from the commonly-used pulse width modulation (PWM), the constant on-time (COT) approach is adopted herein with a dynamic charging algorithm to automatically adjust the operating frequency, thus profiting from less circuit complexity, improvement of cross regulation, and high transfer efficiency in unbalanced load cases. The total maximum output power is 320 mW, as the switching frequency varies from 650 kHz to 0 Hz, and the maximum efficiency reaches 83.1% by simulation. The converter was fabricated by TSMC 0.25μm 1P3M high voltage CMOS technology for verification.

Original languageEnglish
Title of host publicationProceedings of the 16th International Symposium on Quality Electronic Design, ISQED 2015
PublisherIEEE Computer Society
Pages552-555
Number of pages4
ISBN (Electronic)9781479975815
DOIs
StatePublished - 13 Apr 2015
Event16th International Symposium on Quality Electronic Design, ISQED 2015 - Santa Clara, United States
Duration: 2 Mar 20154 Mar 2015

Publication series

NameProceedings - International Symposium on Quality Electronic Design, ISQED
Volume2015-April
ISSN (Print)1948-3287
ISSN (Electronic)1948-3295

Conference

Conference16th International Symposium on Quality Electronic Design, ISQED 2015
CountryUnited States
CitySanta Clara
Period2/03/154/03/15

Keywords

  • Constant on-time (COT)
  • organic light-emitting diode (OLED)
  • pulse frequency modulation (PFM)
  • Single-inductor bipolar multiple-output (SIBMO)

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