A high-efficiency DC–DC buck converter for sub-2×VDD power supply

Wang, Chua-Chin; Chen, Chih-Lin; Wang, Ching-Lin

doi:10.1016/j.mejo.2011.02.004

Cited by 12 publications

(4 citation statements)

References 5 publications

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“…The power management chips for microprocessors are fast-changing loads, so the power management chip needs to respond to load changes quickly [6,7]. With the increasing demand for intelligence and modularity, the load will change to be faster and more complex, which puts higher demands on the dynamic characteristics of the power management chip [8][9][10]. Feedback control is the main factor to ensure the converter's output is stable under different load conditions.…”

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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Section: Introductionmentioning

confidence: 99%

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

Sun,

Chen,

Wang

et al. 2023

Micromachines

View full text Add to dashboard Cite

show abstract

“…A long well-known problem is that the on-chip PWM-based SMPS DC-DC converter has poor efficiency when the load is light [4]. Although PFM-based DC-DC converter is proved to have a better efficiency in the same scenario, it results in serious high ripple at the output voltage, which is unacceptable in many sophisticated applications, such as CPU/GPU control.…”

Section: Introductionmentioning

confidence: 99%

“…With the same output current, when the resistance is equal to the load resistance, the efficiency is close to 50%. If the efficiency is expected to be greater than 90%, the turn-on resistance Ron must be at least one-tenth of the load resistance Rload [4]. Thus, to get a better efficiency, the first thing to carry out is to reduce the turn-on resistance of the power MOSFETs.…”

Section: Introductionmentioning

confidence: 99%

An On-Chip PWM-Based DC-DC Buck Converter Design with High- Efficiency Light Load Mode Operation

2018

Proceedings of 2018 the 8th International Workshop on Computer Science and Engineering

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This paper demonstrates a DC-DC buck converter with a PWM (pulse width modulation) feedback control loop, which can accommodate the range of power supply voltage from VDD to 2.5xVDD. By utilizing HV (high voltage) MOSFETs provided by HV CMOS technologies, a PWM feedback loop, a Dead-time detector, HV driving transistors and a control circuit are all realized on a single chip. The chip area of the proposed design is less than 1.379x0.813 mm 2 , while the power supply range is as wide as 5-14 V. The proposed design is featured with very high conversion efficiency by shutting off an optimal number of power MOSFETs when detecting the light load to prolong the life time of battery-powered devices. Therefore, it can be integrated in a SOC (system-on-chip) to provide multiple supply voltage sources.

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“…They are widely used in regulated power supplies and also in specialized high power applications such as dc motor drives, battery chargers, plating and welding [1]. State-space averaging has proven in the past to be a very popular analysis technique for deriving various performance characteristics of PWM dc-dc converters [2]. This general method has led to understanding of dynamic performance of PWM converters.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Control of Forward Converter

2011

AMM

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The average model of the forward converter is build with the state-space average method. The open-loop transfer function model is deduced in detail according to the average model of the forward converter, the controller is designed based frequency domain by the type III compensation network. And the stability of the control system has been improved. The modeling and simulation of system was implemented based Matlab. The results of simulation confirm that the controller is capable of reduced steady state error and improve controller's reliability during power supply disturbance and load disturbance．

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A high-efficiency DC–DC buck converter for sub-2×VDD power supply

Cited by 12 publications

References 5 publications

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

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

An On-Chip PWM-Based DC-DC Buck Converter Design with High- Efficiency Light Load Mode Operation

Modeling and Control of Forward Converter

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