Current-mode adaptively hysteretic control for buck converters with fast transient response and improved output regulation

Wu, Kuan-I; Hung, Shuo-Hong; Shieh, S. Leang; Hwang, Bor-Tsang; Hung, Shih-Ya; Chen, Charlie Chung‐Ping

doi:10.1109/iscas.2014.6865294

Cited by 9 publications

(3 citation statements)

References 7 publications

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“…Fixed operating frequency control mechanisms must utilize an error amplifier and additional compensation components to stabilize the output voltage of the DC-DC buck converter. Another type of control scheme is variable operating frequency control, including hysteresis control [6][7][8] and constant on-time control [9][10][11]. First, the hysteresis control is controlled by the ripple of output voltage of the DC-DC buck converter.…”

Section: Introductionmentioning

confidence: 99%

A Low EMI DC-DC Buck Converter with a Triangular Spread-Spectrum Mechanism

2020

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In this paper, a triangular spread-spectrum mechanism is proposed to suppress the electromagnetic interference (EMI) of a DC-DC buck converter. The proposed triangular spread-spectrum mechanism, which is implemented in the chip, can avoid modifying the printed circuit board of switching regulators. In addition, a lower ripple of output voltage of switching regulators and a better system stability can be realized by the inductive DC resistance (DCR) current sensing circuit. The chip is fabricated by using TSMC 0.18-μm 1P6M CMOS technology. The chip area including PADs is 1.2 × 1.15 mm2. The input voltage range is 2.7~3.3 V and the output voltage is 1.8 V. The maximum load current is 700 mA. The off-chip inductor and capacitor are 3.3 μH and 10 μF, respectively. The experimental results demonstrate that the maximum spur of the proposed DC-DC buck converter with the triangular spread-spectrum mechanism improves to 14dBm. Moreover, the transient recovery time of step-up and step-down loads are both 5 μs. The measured maximum efficiency is 94% when the load current is 200 mA.

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Section: Introductionmentioning

confidence: 99%

A Low EMI DC-DC Buck Converter with a Triangular Spread-Spectrum Mechanism

2020

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“…To obtain the effective power conversion, these converters must satisfy several key specifications, such as wide load current range, low voltage and current ripples, fast transient response, high power efficiency, stable operation, and simplicity. For such conversion, hysteresis DC-DC buck converters have been studied as a core technology [1][2][3][4][5][6][7][8]. However, the conventional hysteresis DC-DC buck converter has low power efficiency at light loads due to its high voltage and current ripples.…”

Section: Introductionmentioning

confidence: 99%

A novel adaptive hysteresis DC-DC buck converter for portable devices

Park¹,

Lee²,

Yu³

2019

Turk J Elec Eng & Comp Sci

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This paper presents a new technique that adjusts the hysteresis window depending on the variations in load current caused by a voltage-mode circuit to reduce the voltage and current ripples. Moreover, a compact current-sensing circuit is used to provide an accurate sensing signal for achieving fast hysteresis window adjustment. In addition, a zero-current detection circuit is also proposed to eliminate the reverse current at light loads. As a result, this technique reduces the voltage ripple below 8.08 mV pp and the current ripple below 93.98 mA pp for a load current of 500 mA.Circuit simulation is performed using 0.18 µ m CMOS process parameters.

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“…The hysteretic control technique is the second technique conventionally used. It uses two comparators to restrict the output voltage in a window [7][8][9][10]. Converters which use this control technique have the fastest tracking ability and their steady-state errors can be very small if it is designed well.…”

Section: Introductionmentioning

confidence: 99%

Zero‐steady‐state‐error compensation method in application of peak current mode buck converter with fast transient response

Yao

et al. 2015

IET Power Electronics

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A novel zero-steady-state-error (ZSSE) compensation technique based on an accurate small signal model of peak current mode buck converter is proposed for optimising the microprocessors with low power consumption needing highdefinition voltage scaling. This technique eliminates the steady-state error of output voltage without negatively affecting the transient response. The main parasitic parameters of the buck converter are taken into consideration to design an excellent ZSSE compensation module; the relationships between the parameters of the compensation circuit and parameters of the other parts of the converter have been derived in this study. This technique has been implemented on a prototype. The validity of this method is shown and confirmed by test results.

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Current-mode adaptively hysteretic control for buck converters with fast transient response and improved output regulation

Cited by 9 publications

References 7 publications

A Low EMI DC-DC Buck Converter with a Triangular Spread-Spectrum Mechanism

A Low EMI DC-DC Buck Converter with a Triangular Spread-Spectrum Mechanism

A novel adaptive hysteresis DC-DC buck converter for portable devices

Zero‐steady‐state‐error compensation method in application of peak current mode buck converter with fast transient response

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