A current-mode buck converter with bandwidth reconfigurable for enhanced efficiency and improved load transient response

Wang, Pai-Yi; Wu, Li-Te; Kuo, Tai‐Haur

doi:10.1109/asscc.2014.7008862

Cited by 2 publications

(4 citation statements)

References 9 publications

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“…In this work, the pulse width is designed as Ts/20 for simplicity, where Ts represents one switching period. Consequently, in addition to obtaining fast load-transient response, the advantages of clocktriggered PWM control are also captured, such as high programmability for sophisticated frequency control of various demands simultaneously, including high efficiency, small current ripple, and performing a predictable spectrum compared with hysteresis control [1].…”

Section: System and Circuit Designmentioning

confidence: 99%

“…Current-mode control is frequently used in dc-dc buck converters [1]- [6] due to advantages such as better line transient response and inherent cycle-by-cycle current protection, as compared to voltage-mode control [1]. Type-II compensators are usually applied to current-mode buck converters for obtaining high loop gain to reduce the steady-state error and maintaining loop stability.…”

Section: Introductionmentioning

confidence: 99%

“…In [1], the compensated poles and zero were reconfigured according to the switching frequency (fs) to solve the loop-bandwidth limitation stemming from the lowest fs in a variable-frequency system. However, the load-transient speed is still restricted by the loop bandwidth in such linear control.…”

Section: Introductionmentioning

confidence: 99%

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An undershoot/overshoot-suppressed current-mode buck converter with voltage-setting control for type-II compensator

Wang

Huang

Fang

et al. 2015

2015 IEEE Asian Solid-State Circuits Conference (A-Sscc)

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Current-mode control is frequently used in dc-dc buck converters. Many current-mode buck converters apply type-II compensators for obtaining high loop gain to reduce the steadystate error and maintaining the loop stability with restricted bandwidth. However, when large load-current transients occur, significant transient undershoot/overshoot is generated due to the restricted loop bandwidth. In response, a type-II compensator with the proposed voltage-setting control (VSC) is presented in this paper. By simply setting the voltage of the compensation capacitor and the input voltage of the compensator, the proposed VSC, which is activated by a transient detector, greatly suppresses the transient undershoot and overshoot. Implemented , this work occupies 0.91mm 2 including pads, and features a peak efficiency of 96.3%. With the proposed method, the maximum undershoot and overshoot are respectively suppressed from 150mV to 58mV and 92mV to 62mV for ± 1A load current steps.

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Section: System and Circuit Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An undershoot/overshoot-suppressed current-mode buck converter with voltage-setting control for type-II compensator

Wang

Huang

Fang

et al. 2015

2015 IEEE Asian Solid-State Circuits Conference (A-Sscc)

Self Cite

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“…The buck converter with voltage mode control has a simpler structure but has more complex compensation circuits and slower transient response, and it is unable to monitor current [13]. The constant on-time (COT) controlled buck converters have recently been proposed due to their simple compensation structure and fast load transient response [14]. However, subharmonic oscillations may occur in some cases [15,16].…”

Section: Introductionmentioning

confidence: 99%

A Fast Transient Adaptive On-Time Controlled BUCK Converter with Dual Modulation

Sun,

Chen,

Wang

et al. 2023

Micromachines

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This paper proposed a fully integrated adaptive on-time (AOT) controlled buck converter with fast load transient. An adaptive on-time generator is presented to stabilize the output frequency. To enhance the light load efficiency, the converter could transfer from the pulse width modulation (PWM) to pulse skip modulation (PSM) as the load current decreases. The buck converter can switch between these two modulation modes adaptively with the assistance of a zero current detection circuit. Implemented in the TSMC 0.18 µm BCD (BiCMOS/DMOS) process, the proposed buck converter works with an input voltage ranging from 5.5 to 15 V, an output voltage ranging from 0.5 to 5 V, and an output load ranging up to 5 A. The experimental results show that based on the dual modulation adaptive on-time controlled mode, the transient recovery time from light to heavy load and from heavy load to light load is 13 µs and 15 µs, respectively. An overshot voltage of 57 mV and an undershot voltage of 53 mV are also achieved.

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A current-mode buck converter with bandwidth reconfigurable for enhanced efficiency and improved load transient response

Cited by 2 publications

References 9 publications

An undershoot/overshoot-suppressed current-mode buck converter with voltage-setting control for type-II compensator

An undershoot/overshoot-suppressed current-mode buck converter with voltage-setting control for type-II compensator

A Fast Transient Adaptive On-Time Controlled BUCK Converter with Dual Modulation

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