NDLI: Small-signal model analysis and design of constant-on-time $V^{2}$ control for low-ESR caps with external ramp compensation

Content Provider	IEEE Xplore Digital Library
Author	Shuilin Tian Kuang-Yao Cheng Lee, F.C. Mattavelli, P.
Copyright Year	2011
Description	Author affiliation: Center for Power Electronics Systems, Virginia Tech, Blacksburg, 24061 USA (Shuilin Tian; Lee, F.C.; Mattavelli, P.) \|\| Texas Instruments, Warwick, RI, 02886, USA (Kuang-Yao Cheng)
Abstract	Constant-on-time $V^{2}$ control is widely used in DC-DC buck converters. However, sub-harmonic oscillations occur in constant-on-time $V^{2}$ control employing low-ESR caps. For digital constant-on-time $V^{2}$ control, the instability issue is worse due to the sampling effect. In both cases, external ramp compensation is one simple solution to solve the instability issue, although the characteristic of constant-on-time $V^{2}$ with external ramp is not fully understood. This paper provides design guidelines for external ramp by factorizing the previous small-signal model of analog constant-on-time $V^{2}$ control. Then the design strategy of the external ramp is extended to digital constant-on-time $V^{2}$ control. Moreover, the small-signal models between analog and digital constant-on-time $V^{2}$ control are compared to reveal the sampling effect. The small-signal analysis is verified with simulation and experimental results.
Starting Page	2944
Ending Page	2951
File Size	925727
Page Count	8
File Format	PDF
ISBN	9781457705427
e-ISBN	9781457705410
DOI	10.1109/ECCE.2011.6064165
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-09-17
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Low-ESR caps Digital control Switching frequency Capacitors Stability criteria Transfer functions External ramp Constant-on-time $V^{2}$ control Oscillators Guidelines
Content Type	Text
Resource Type	Article

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