Pseudo-Constant Switching Frequency in On-Time Controlled Buck Converter with Predicting Correction Techniques

Wei Chung Chen, Hsin Chieh Chen, Meng Wei Chien, Ying Wei Chou, Ke-Horng Chen, Ying Hsi Lin, Tsung Yen Tsai, Shian Ru Lin, Chao Cheng Lee

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

The predicting correction technique (PCT) is proposed to achieve an adaptive on-time control for ripple-based buck converters. The switching frequency f SW variation is suppressed when the PCT technique considers complete parasitic resistances of the components and devices. Even without extra clock-controlled circuits and current sensing circuits, the buck converter operates with a nearly constant f SW over a wide load range. Parasitic resistances almost cause no influence and restriction on f SW . Only input voltage is used to predict the adaptive on-time. Measurement results show only 0.32% in Δf SW /f SW and 5.7 kHz/A in Δf SW /ΔI LOAD in case of 1.4 A load current change and f SW is 2.5 MHz. Consequently, a pseudo-constant f SW with well-defined noise spectrum strongly benefits the solution of electromagnetic interference (EMI) for system-on-a-chip (SoC) applications.

Original languageEnglish
Article number7160756
Pages (from-to)3650-3662
Number of pages13
JournalIEEE Transactions on Power Electronics
Volume31
Issue number5
DOIs
StatePublished - 1 May 2016

Keywords

  • Adaptive on-time control
  • DC-DC converter
  • direct current resistance
  • on resistance
  • on time control
  • predicting correction technique (PCT)
  • switching frequency

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