Fast Transient DC-DC Converter with On-Chip Compensated Error Amplifier

Huang, Hong-Wei; Ho, Hsin-Hsin; Chien, Chieh-Ching; Chen, Ke-Horng; Ma, Gin-Kou; Kuo, Sy‐Yen

doi:10.1109/esscir.2006.307596

Cited by 23 publications

(11 citation statements)

References 14 publications

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“…However, the circuit complexity, output ripple, and noise issue are not effectively treated at the same time [6]- [9]. For high-switching operation, it is important to carefully consider the specifications at the same time since the performance of the power converter will be deteriorated and the load current range will be limited [10], [11]. Furthermore, in the current-mode control, high-switching frequency decreases system accuracy due to limited response time of the inductor current sensor [12]- [14].…”

Section: Introductionmentioning

confidence: 99%

Dual Modulation Technique for High Efficiency in High-Switching Buck Converters Over a Wide Load Range

Tsai

Huang

Lai

et al. 2011

IEEE Trans. Circuits Syst. I

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A dual modulation technique to improve power conversion efficiency with minimal increase in output voltage ripple is presented. The worsening switching noise caused by parasitic resistance and inductance due to high-switching operation can also be alleviated by the proposed ac ripple detector. Furthermore, the dual modulation method can speed up the load transient response since the switching frequency can increase to 5 MHz during the transient period. At very light loads, the switching frequency is always kept higher than the acoustic frequency to avoid noisy sound. Experiment results show that the converter operates at 5 MHz using a small inductor of 1 H. The load transient response time is shorter than 3 s when load current changes from 150 to 450 mA or vice versa. Power efficiency is kept higher than 85% over a wide load current range. Specifically, light efficiency can be raised to about 45% above that of the conventional design.Index Terms-DC-DC buck converter, dual modulation technique, hopping frequency modulator (HFM), loading potential detector (LPD) .

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Section: Introductionmentioning

confidence: 99%

Dual Modulation Technique for High Efficiency in High-Switching Buck Converters Over a Wide Load Range

Tsai

Huang

Lai

et al. 2011

IEEE Trans. Circuits Syst. I

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“…The voltage feedback loop -constituted of R FB1 , R FB2 in Figure 17 -must be compensated to provide stability margin, and to minimise the output voltage overshoot and undershoot response to line and load transients (Huang et al 2006). In the novel proposed PWM control circuit, a Type III error amplifier compensation network is used.…”

Section: Error Amplifiermentioning

confidence: 99%

A novel PWM control for a bi-directional full-bridge DC–DC converter with smooth conversion mode transitions

Lorentz

Schwarzmann

März

et al. 2011

International Journal of Electronics

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A novel CMOS integrated pulse-width modulation (PWM) control circuit allowing smooth transitions between conversion modes in full-bridge based bi-directional DC-DC converters operating at high switching frequencies is presented. The novel PWM control circuit is able to drive full-bridge based DC-DC converters performing step-down (i.e. buck) and step-up (i.e. boost) voltage conversion in both directions, thus allowing charging and discharging of the batteries in mobile systems. It provides smooth transitions between buck, buck-boost and boost modes. Additionally, the novel PWM control loop circuit uses a symmetrical triangular carrier, which overcomes the necessity of using an output phasing circuit previously required in PWM controllers based on sawtooth oscillators. The novel PWM control also enables to build bi-directional DC-DC converters operating at high switching frequencies (i.e. up to 10 MHz and above). Finally, the proposed PWM control circuit also allows the use of an average lossless inductor-current sensor for sensing the average load current even at very high switching frequencies. In this article, the proposed PWM control circuit is modelled and the integrated CMOS schematic is given. The corresponding theory is analysed and presented in detail. The circuit simulations realised in the Cadence Spectre software with a commercially available 0.18 mm mixed-signal CMOS technology from UMC are shown. The PWM control circuit was implemented in a monolithic integrated bi-directional CMOS DC-DC converter ASIC prototype. The fabricated prototype was tested experimentally and has shown performances in accordance with the theory.

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“…This reduces the gate capacity, and therefore the gatecharge losses, when the DC-DC converter supplies the load with only a fraction of the nominal output current (e.g., when the mobile system is in standby mode). This concept was first proposed as a discrete dual-gate MOSFET [3], and recently integrated in complex CMOS DC-DC converters [4,5]. Other methods for improving the light load conversion efficiency in DC-DC converters operating at constant switching frequencies have been investigated in literature (e.g., dynamic voltage scaling of the gate-drive voltage), but DWC has not shown its limits yet for improving the light-load power conversion efficiency [6].…”

Section: Introductionmentioning

confidence: 99%

Light-load efficiency increase in high-frequency integrated DC–DC converters by parallel dynamic width controlling

Lorentz

Berberich

März

et al. 2009

Analog Integr Circ Sig Process

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A significant improvement of the light load conversion efficiency in integrated CMOS DC-DC converters using pulse-width modulation (PWM) at constant switching frequencies above 1 MHz can be obtained by implementing dynamic width controlling (DWC) of the power transistors. The parallel implementation of DWC uses equally sized power cells, each containing the power transistor and its gate driver stages. The power cells are connected together in a parallel arrangement to limit the propagation delays and to avoid the transmission gates used in serial implementations. Due to this, higher switching frequencies can be realized. Advanced simulations were performed with Cadence Spectre combined with Mathematica to investigate the conversion efficiency improvement potential offered by DWC. With DWC, an absolute increase of the light load conversion efficiency as high as 29% can be achieved for switching frequencies in the range 1-10 MHz. Further, a conversion efficiency higher than 80% can be provided over roughly two decades of load current for a DC-DC converter operating at a switching frequency of 10 MHz. Experimental results obtained from a synchronous buck converter designed in a 0.18 µm CMOS technology and switched at 2 MHz in continuous conduction mode (CCM) have demonstrated an improvement of the light-load conversion efficiency of about 25%

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Fast Transient DC-DC Converter with On-Chip Compensated Error Amplifier

Cited by 23 publications

References 14 publications

Dual Modulation Technique for High Efficiency in High-Switching Buck Converters Over a Wide Load Range

Dual Modulation Technique for High Efficiency in High-Switching Buck Converters Over a Wide Load Range

A novel PWM control for a bi-directional full-bridge DC–DC converter with smooth conversion mode transitions

Light-load efficiency increase in high-frequency integrated DC–DC converters by parallel dynamic width controlling

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