NDLI: Multibit <formula formulatype=inline><tex>$Sigma$</tex></formula>–<formula formulatype=inline><tex>$Delta$</tex></formula> PWM Digital Controller IC for DC–DC Converters Operating at Switching Frequencies Beyond 10 MHz

Content Provider	IEEE Xplore Digital Library
Author	Lukic, Z. Rahman, N. Prodic, A.
Copyright Year	1986
Abstract	An integrated digital controller for dc-dc switch-mode power supplies (SMPS) used in portable applications is introduced. The controller has very low power consumption, fast dynamic response, and can operate at programmable constant switching frequencies exceeding 10 MHz. To achieve these characteristics, three novel functional blocks, a digital pulse-width modulator based on second-order sigma-delta concept (Sigma-Delta DPWM), dual-clocking mode compensator, and nonlinear analog-to-digital converter are combined. In steady state, to minimize power consumption, the controller is clocked at a frequency lower than SMPS switching frequency. During transients the clock rate is increased to the switching frequency improving transient response. The controller integrated circuit (IC) is fabricated in a standard 0.18-mum process and tested with a 750-mW buck converter prototype. Experimental results show the controller current consumption of 55 muA/MHz and verify closed-loop operation at programmable switching frequencies up to 12.3 MHz. Simulation results indicating that this architecture can potentially support operation at switching frequencies beyond 100 MHz are also presented.
Sponsorship	IEEE Power Electronics Society
Starting Page	1693
Ending Page	1707
Page Count	15
File Size	1905217
File Format	PDF
ISSN	08858993
Volume Number	22
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Pulse width modulation Pulse width modulation converters Digital control Digital integrated circuits Digital-to-frequency converters Switching converters Switching frequency Switched-mode power supply Energy consumption Delta-sigma modulation second-order sigma–delta DPWM high-frequency low-power dc–dc converter
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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