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access icon free Critical ESR of output capacitor for stability of fixed off-time controlled buck converter

  • Author(s): B.C. Bao 1 ; X. Zhang 1 ; J.P. Xu 2 ; J.P. Wang 2
    • View affiliations
    • Affiliations: 1: School of Information Science and Engineering, Changzhou University, Changzhou 213164, Jiangsu, People's Republic of China;
      2: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, People's Republic of China
  • Source: Volume 49, Issue 4, 14 February 2013, p. 287 – 288
    DOI:  10.1049/el.2012.2607 , Print ISSN 0013-5194, Online ISSN 1350-911X
© The Institution of Engineering and Technology
Received 26/07/2012, Published

Fixed off-time control, contrasting with constant on-time control, has been widely used for power supply controllers in industry owing to its fast transient response. However the equivalent series resistance (ESR) of the output capacitor has a great effect on the control performance. In this reported work, the critical ESR of the output capacitor for the stability of the fixed off-time controlled buck converter is derived by quantitative analysis and verified by circuit simulations, which indicates that the converter is in normal operation when the ESR is larger than the critical ESR, otherwise the converter works abnormally.

Inspec keywords: electric resistance; capacitors; power convertors; circuit simulation

Other keywords: circuit simulation; equivalent series resistance; critical ESR; fixed off-time controlled buck converter; quantitative analysis; output capacitor

Subjects: Capacitors; Power electronics, supply and supervisory circuits

References

    1. 1)
      • 3. Li, J., Lee, F.C.: ‘Modeling of V2 current-model control’, IEEE Trans. Circuits Syst. I, Reg. Pprs, 2010, 57, (9), pp. 2552–2563 (doi: 10.1109/TCSI.2010.2043018).
    2. 2)
      • 1. Panov, Y., Jovanović, M.M.: ‘Adaptive off-time control for variable-frequency, soft-switched flyback converter at light loads’, IEEE Trans. Power Electron., 2002, 17, (4), pp. 596–603 (doi: 10.1109/TPEL.2002.800958).
    3. 3)
      • 2. Wang, J.P., Xu, J.P., Bao, B.C.: ‘Pulse bursting phenomenon in constant on-time controlled buck converter’, IEEE Trans. Ind. Electron., 2011, 58, (12), pp. 5406–5410 (doi: 10.1109/TIE.2011.2123861).
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