A voltage-mode DC—DC buck converter with fast output voltage-tracking speed and wide output voltage range

2014 ◽  
Vol 35 (5) ◽  
pp. 055005 ◽  
Author(s):  
Miao Yang ◽  
Baixue Zhang ◽  
Yun Cao ◽  
Fengfeng Sun ◽  
Weifeng Sun
Keyword(s):  
Output Voltage ◽  
Buck Converter ◽  
Voltage Range ◽  
Voltage Mode

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

Energies ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 856
Author(s):  
Jing-Yuan Lin ◽  
Yi-Chieh Hsu ◽  
Yo-Da Lin
Keyword(s):  
Spread Spectrum ◽  
Electromagnetic Interference ◽  
Output Voltage ◽  
Buck Converter ◽  
Circuit Board ◽  
System Stability ◽  
Maximum Efficiency ◽  
Load Current ◽  
Voltage Range ◽  
Switching Regulators

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.

A Time-Domain-Controlled Current-Mode Buck Converter With Wide Output Voltage Range

2019 ◽  
Vol 54 (3) ◽  
pp. 865-873 ◽  
Author(s):  
Jin-Gyu Kang ◽  
Jeongpyo Park ◽  
Min-Gyu Jeong ◽  
Changsik Yoo
Keyword(s):  
Time Domain ◽  
Output Voltage ◽  
Current Mode ◽  
Buck Converter ◽  
Voltage Range

EMI Noise Reduction of DC-DC Switching Converters with Automatic Output Ripple Cancellation

2020 ◽  
Vol 38 ◽  
pp. 157-170
Author(s):  
Yasunori Kobori ◽  
Yi Fei Sun ◽  
Minh Tri Tran ◽  
Anna Kuwana ◽  
Haruo Kobayashi
Keyword(s):  
Noise Reduction ◽  
Output Voltage ◽  
Current Mode ◽  
Buck Converter ◽  
Operating Frequency ◽  
Switching Converters ◽  
Stable Level ◽  
Voltage Mode ◽  
Voltage Ripple ◽  
Ripple Cancellation

This paper proposes new EMI reduction technologies and automatic output voltage ripple cancellation method for the PWM buck converter with voltage-mode or current-mode and the ripple-controlled converters. Genenrally, modfying the clock frequeny is effective to reduce the EMI noise, but it may increase the output ripple substantially. We have developed techniques to cancel the increased ripple by modifying the slope of the saw-tooth signal or current of the ripple injection circuit. The EMI spectrum of the operating frequency is reduced by more than 15dB and the modified large ripple is canceled to the stable level.

scholarly journals Analysis and Design for Output Voltage Regulation in Constant-on-Time-Controlled Fly-Buck Converter

Electronics ◽  
2021 ◽  
Vol 10 (16) ◽  
pp. 1886
Author(s):  
Younghoon Cho ◽  
Paul Jang
Keyword(s):  
Output Voltage ◽  
Voltage Regulation ◽  
Design Guidelines ◽  
Buck Converter ◽  
Design Guideline ◽  
Analysis And Design ◽  
Flyback Converter ◽  
Auxiliary Power ◽  
Primary Output ◽  
Output Capacitor

Fly-buck converter is a multi-output converter with the structure of a synchronous buck converter structure on the primary side and a flyback converter structure on the secondary side, and can be utilized in various applications due to its many advantages. In terms of control, the primary side of the fly-buck converter has the same structure as a synchronous buck converter, allowing the constant-on-time (COT) control to be applied to the fly-buck converter. However, due to the inherent energy transfer principle, the primary-side output voltage regulation of COT controlled fly-buck converters may be poor, which can deteriorate the overall converter performance. Therefore, the primary output capacitor must be carefully designed to improve the voltage regulation characteristics. In this paper, a theoretical analysis of the output voltage regulation in COT controlled fly-buck converter is conducted, and based on this, a design guideline for the primary output capacitor considering the output voltage regulation is presented. The validity of the analysis and design guidelines was verified using a 5 W prototype of the COT controlled fly-buck converter for telecommunication auxiliary power supply.

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