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A 25 MHz Fast Transient Adaptive-On/Off-Time Controlled Three-Level Buck Converter.
- Source :
-
IEEE Transactions on Circuits & Systems. Part I: Regular Papers . Jun2022, Vol. 69 Issue 6, p2601-2613. 13p. - Publication Year :
- 2022
-
Abstract
- This work presents a 25 MHz adaptive on/off-time-controlled three-level buck converter with a fast reference tracking speed and high light load efficiency. The self-balancing scheme of the flying capacitor voltage is revised and extended for a broad conversion ratio range from 0.17 to 0.833. To reduce the error of the self-balancing scheme when applied to a high frequency three-level buck converter with an on-chip flying capacitor, a real-time calibration loop on the flying capacitor voltage is introduced, effectively reducing the balancing error from 340 mV to 20 mV. A turning-point output voltage prediction for the three-level buck converter is presented to achieve near-optimal reference tracking with a fast tracking speed and negligible output voltage undershoot or overshoot. The up- and down-tracking takes 81 ns and 72 ns, respectively, for a 1-V step with an inductor of 47 nH and an output capacitor of 47 nF. The three-level converter achieves a precise discontinuous conduction mode (DCM) operation with an adaptive switching frequency at light load by means of a feedback loop-based method. An approximately 28.2% increment in efficiency is achieved with a load of 10 mA. The three-level buck converter has a peak efficiency of 92.8% and an over 85% efficiency in most of the operation regions. [ABSTRACT FROM AUTHOR]
- Subjects :
- *SPEED of light
*CAPACITORS
*VOLTAGE
*VOLTAGE control
Subjects
Details
- Language :
- English
- ISSN :
- 15498328
- Volume :
- 69
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Circuits & Systems. Part I: Regular Papers
- Publication Type :
- Periodical
- Accession number :
- 157191469
- Full Text :
- https://doi.org/10.1109/TCSI.2022.3151634