Abstract
High-bandwidth buck voltage regulator with peak current-mode control is a commonly-used scheme, especially for CPU power applications. However, the conventional single-frequency and three-frequency models are inaccurate in modeling the loop gain stability when the control bandwidth is close or higher than one-third of the converter switching frequency. A more accurate four-frequency small-signal model for a high-bandwidth buck converter with peak current-mode control is proposed in the present paper. The describing function approach is used to model the duty-cycle modulator. The effects of the four-frequency components, including the modulating frequency, the two sideband harmonics, and the switching frequency, are considered. Simulations and experiments verified the results.
| Original language | English |
|---|---|
| Pages (from-to) | 25633-25644 |
| Number of pages | 12 |
| Journal | IEEE Access |
| Volume | 10 |
| DOIs | |
| State | Published - 2022 |
Bibliographical note
Publisher Copyright:© 2013 IEEE.
Keywords
- Buck converter
- current-mode control
- describing function (DF)
- high bandwidth
- modeling
- voltage regulators (VRs)