Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 35, Issue 4, Pages 3729-3739Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2019.2936524
Keywords
Voltage control; Q-factor; Transient response; Buck converters; Integrated circuit modeling; Capacitors; Transfer functions; Constant on-time (COT); describing function (DF); power management integrated circuit (PMIC); small-signal modeling
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Funding
- Richtek Corporation in Taiwan
- National Taiwan University [NTU-CC-108L890701]
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The ripple-based constant on-time (COT) control with ripple compensation has been widely adopted in buck converters in the recent years because of its simplicity, fast transient response, and high light-load efficiency. However, this control has the potential issues of instability and excessive load transient response with wide inputoutput voltage range conditions in the power management integrated circuit (PMIC) applications. In this article, an accurate adaptive COT control scheme is proposed to solve these problems. The control scheme achieves accurate output voltage, and nearly constant quality factor and well transient response over a wide-range operation with simple circuit. The small-signal model is also derived based on the describing function (DF) technique for design optimization. Finally, the simulations and experimental verifications were conducted to verify the proposed concepts.
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