A Comparator-Less Buck Converter with Fast Transient Response Using a Reactive Ramp Generator
This paper introduces a voltage-mode DC-DC buck converter designed to address the challenges of high-frequency operation. The proposed comparator-less Reactive Ramp Generator (RRG) topology mitigates the issues associated with comparator delays, achieving a fast load transient response. By eliminati...
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| Format: | Article |
| Language: | English |
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MDPI AG
2025-01-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/18/2/307 |
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| author | Young-Kyu Kim Chung-Hee Jang Dong-Hyun Shin Kwang-Hyun Baek |
| author_facet | Young-Kyu Kim Chung-Hee Jang Dong-Hyun Shin Kwang-Hyun Baek |
| author_sort | Young-Kyu Kim |
| collection | DOAJ |
| description | This paper introduces a voltage-mode DC-DC buck converter designed to address the challenges of high-frequency operation. The proposed comparator-less Reactive Ramp Generator (RRG) topology mitigates the issues associated with comparator delays, achieving a fast load transient response. By eliminating all comparators from the buck converter’s control circuit, we prevent potential delay-induced malfunctions, thereby enhancing overall operational reliability. The rapid response of the RRG, enabled by a short feedback loop, allows for swift output voltage regulation during load transients. Replacing comparators in the PWM controller with inverters effectively removes delay issues without adding complexity. Since the proposed design retains the conventional voltage-mode transfer function, standard type-3 compensation is readily applicable. Operating with a 3.3 V input, the buck converter provides an output range from 0.65 V to 3.0 V, achieving a settling time of 0.802 µs for load changes from 200 mA to 1 A, and 1.27 µs for load changes from 1 A to 200 mA. The proposed architecture achieves a peak efficiency of 92.78% at 2.4 V and 600 mA. |
| format | Article |
| id | doaj-art-7296ed05e649475f8b0b355499a8fdf1 |
| institution | Kabale University |
| issn | 1996-1073 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj-art-7296ed05e649475f8b0b355499a8fdf12025-01-24T13:30:58ZengMDPI AGEnergies1996-10732025-01-0118230710.3390/en18020307A Comparator-Less Buck Converter with Fast Transient Response Using a Reactive Ramp GeneratorYoung-Kyu Kim0Chung-Hee Jang1Dong-Hyun Shin2Kwang-Hyun Baek3Department of Intelligent Semiconductor Engineering, Chung-Ang University, Seoul 06974, Republic of KoreaDepartment of Intelligent Semiconductor Engineering, Chung-Ang University, Seoul 06974, Republic of KoreaDepartment of Intelligent Semiconductor Engineering, Chung-Ang University, Seoul 06974, Republic of KoreaDepartment of Intelligent Semiconductor Engineering, Chung-Ang University, Seoul 06974, Republic of KoreaThis paper introduces a voltage-mode DC-DC buck converter designed to address the challenges of high-frequency operation. The proposed comparator-less Reactive Ramp Generator (RRG) topology mitigates the issues associated with comparator delays, achieving a fast load transient response. By eliminating all comparators from the buck converter’s control circuit, we prevent potential delay-induced malfunctions, thereby enhancing overall operational reliability. The rapid response of the RRG, enabled by a short feedback loop, allows for swift output voltage regulation during load transients. Replacing comparators in the PWM controller with inverters effectively removes delay issues without adding complexity. Since the proposed design retains the conventional voltage-mode transfer function, standard type-3 compensation is readily applicable. Operating with a 3.3 V input, the buck converter provides an output range from 0.65 V to 3.0 V, achieving a settling time of 0.802 µs for load changes from 200 mA to 1 A, and 1.27 µs for load changes from 1 A to 200 mA. The proposed architecture achieves a peak efficiency of 92.78% at 2.4 V and 600 mA.https://www.mdpi.com/1996-1073/18/2/307buck convertercomparator delaydc-dc converterhigh frequencyinverterpulse-width modulation (PWM) |
| spellingShingle | Young-Kyu Kim Chung-Hee Jang Dong-Hyun Shin Kwang-Hyun Baek A Comparator-Less Buck Converter with Fast Transient Response Using a Reactive Ramp Generator Energies buck converter comparator delay dc-dc converter high frequency inverter pulse-width modulation (PWM) |
| title | A Comparator-Less Buck Converter with Fast Transient Response Using a Reactive Ramp Generator |
| title_full | A Comparator-Less Buck Converter with Fast Transient Response Using a Reactive Ramp Generator |
| title_fullStr | A Comparator-Less Buck Converter with Fast Transient Response Using a Reactive Ramp Generator |
| title_full_unstemmed | A Comparator-Less Buck Converter with Fast Transient Response Using a Reactive Ramp Generator |
| title_short | A Comparator-Less Buck Converter with Fast Transient Response Using a Reactive Ramp Generator |
| title_sort | comparator less buck converter with fast transient response using a reactive ramp generator |
| topic | buck converter comparator delay dc-dc converter high frequency inverter pulse-width modulation (PWM) |
| url | https://www.mdpi.com/1996-1073/18/2/307 |
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