Modeling and design for a novel adaptive voltage positioning (AVP) scheme for multiphase VRMs

被引：60

作者：

Lee, Martin ^{[1
]}

Chen, Dan ^{[1
]}

Huang, Kevin ^{[1
]}

Liu, Chih-Wen ^{[1
]}

Tai, Ben ^{[2
]}

机构：

[1] Natl Taiwan Univ, Dept Elect Engn, Taipei 10617, Taiwan

[2] RichTek Technol Corp, Chubei City 30288, Hsinchu, Taiwan

来源：

IEEE TRANSACTIONS ON POWER ELECTRONICS | 2008年 / 23卷 / 04期

关键词：

adaptive voltage positioning (AVP) plus control; constant output impedance; stability; voltage regulator;

D O I：

10.1109/TPEL.2008.924822

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Adaptive voltage positioning (AVP) has been used in multiphase voltage regulator module (VRM) applications. A novel scheme, called AVP+, is analyzed in this paper. Small signal model is used to look into the control performance issues such as output impedance and stability. The model has been verified in the experiments and simulations. Compared to a conventional AVP schemes, the present scheme provides better stability margin and output-impedance performance. This is especially true for the prevailing trend of using ceramic output capacitors and high switching frequency. The focus of the present paper is the small-signal modeling for control loop design using the AVP+ scheme which was never analyzed before. And the comparisons were made between AVP+ and AVP- on the stability and output impedance performance.

引用

页码：1733 / 1742

页数：10

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