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Control Systems

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Design and Implementation of Fully-Integrated Inductive DC-DC Converters in Standard CMOS

Part of the book series: Analog Circuits and Signal Processing ((ACSP))

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Abstract

The control system is responsible for the second important task of the DC-DC converter: Regulating the output voltage to the desired level. For the purpose of monolithic DC-DC converters a new set of challenges emerge, both in terms of the control strategy and the basic design of the control system. This is due to the requirement of high switching frequencies and short switching times, needed to guarantee the optimal performance of the monolithic DC-DC converter. Therefore, novel control strategies are proposed in this chapter. These discussions include the principle of the control strategies and the circuits used in the practical chip implementations discussed in this book. In this chapter the two conventional control strategies PWM and PFM are discussed and compared to each other in Sect. 5.1. The Constant On/Off-Time (COOT) control strategy, together with implementation examples for single-phase, single-output and multi-output converters, is explained in Sect. 5.2. The Semi-Constant On/Off-Time (SCOOT) control strategy, together with implementation examples for multi-phase and multiple-output converters, is explained in Sect. 5.3. The Feed-Forward Semi-Constant On/Off-Time (F2-SCOOT) control strategy, together with an implementation example, is discussed in Sect. 5.4. The aspect of start-up, in combination with some start-up circuit implementations, is discussed in Sect. 5.5. Finally, the chapter is concluded in Sect. 5.6.

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Notes

  1. 1.

    The PFM control technique for DC-DC converters is also referred to as ripple-based control, hysteric control, bang-bang control and one-shot control.

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Authors and Affiliations

  1. ESAT-MICAS, Dept. Elektrotechniek, K.U. Leuven, Room 91.22, Kasteelpark, Arenberg 10, Leuven, B-3001, Belgium

    Dr. Mike Wens

  2. ESAT-MICAS, Dept. Elektrotechniek, K.U. Leuven, Kardinaal Mercierlaan 94, Heverlee, B-3001, Belgium

    Prof. Dr. Michiel Steyaert

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Correspondence to Mike Wens .

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Wens, M., Steyaert, M. (2011). Control Systems. In: Design and Implementation of Fully-Integrated Inductive DC-DC Converters in Standard CMOS. Analog Circuits and Signal Processing. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-1436-6_5

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  • DOI: https://doi.org/10.1007/978-94-007-1436-6_5

  • Publisher Name: Springer, Dordrecht

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