Multimode Digital Controller for Synchronous Buck Converters Operating Over Wide Ranges of Input Voltages and Load Currents

This paper describes a digital pulsewidth modulation/pulse-frequency modulation (PWM/PFM) controller with input-voltage feedforward (IVFF) for synchronous buck dc-dc converters. The controller includes automatic PWM/PFM mode switching and effective synchronous operation with a minimum number of active components and without the need for current sensing in PFM mode of operation. IVFF improves efficiency and dynamic performance over a wide range of input voltages. Controller parameters, including the PWM switching frequency, the PFM pulse period, and the mode transition point are programmable, which enables efficiency optimization. Experimental results are shown for a synchronous buck converter with 5-12 V input voltage, and 1.3 V, 0-10 A output.

[1]  Seth R. Sanders,et al.  Architecture and IC implementation of a digital VRM controller , 2003 .

[2]  Biranchinath Sahu,et al.  An Accurate, Low-Voltage, CMOS Switching Power Supply With Adaptive On-Time Pulse-Frequency Modulation (PFM) Control , 2007, IEEE Transactions on Circuits and Systems I: Regular Papers.

[3]  Wai Tung Ng,et al.  A digital predictive on-line energy optimization scheme for dc-dc converters , 2007, APEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and Exposition.

[4]  A. Prodic,et al.  Digital PWM controller and current estimator for a low-power switching converter , 2000, COMPEL 2000. 7th Workshop on Computers in Power Electronics. Proceedings (Cat. No.00TH8535).

[5]  K.I. Hwu,et al.  Applying a Counter-based PFM Control Strategy to an FPGA-based SR Forward Converter , 2006, TENCON 2006 - 2006 IEEE Region 10 Conference.

[6]  D. Maksimovic,et al.  Digital PWM controller with feed-forward compensation , 2004, Nineteenth Annual IEEE Applied Power Electronics Conference and Exposition, 2004. APEC '04..

[7]  A. Prodic,et al.  All-digital DPWM/DPFM controller for low-power DC-DC converters , 2006, Twenty-First Annual IEEE Applied Power Electronics Conference and Exposition, 2006. APEC '06..

[8]  Aleksandar Prodic,et al.  High-frequency digital controller IC for DC/DC converters , 2002, APEC. Seventeenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.02CH37335).

[9]  Robert W. Erickson,et al.  DC-DC converter design for battery-operated systems , 1995, Proceedings of PESC '95 - Power Electronics Specialist Conference.

[10]  A.P. Chandrakasan,et al.  Ultra low power control circuits for PWM converters , 1997, PESC97. Record 28th Annual IEEE Power Electronics Specialists Conference. Formerly Power Conditioning Specialists Conference 1970-71. Power Processing and Electronic Specialists Conference 1972.

[11]  A. J. Edstrom,et al.  Open-loop peak voltage feedforward control of PWM buck converter , 2000 .

[12]  Siyuan Zhou,et al.  A high efficiency, soft switching DC-DC converter with adaptive current-ripple control for portable applications , 2006, IEEE Transactions on Circuits and Systems II: Express Briefs.

[13]  A.V. Peterchev,et al.  A 4-/spl mu/a quiescent-current dual-mode digitally controlled buck converter IC for cellular phone applications , 2004, IEEE Journal of Solid-State Circuits.

[14]  G. Capponi,et al.  Architecture of a digital PFM controller for IC implementation , 2004, 2004 IEEE Workshop on Computers in Power Electronics, 2004. Proceedings..

[15]  A. Prodic,et al.  Programmable Analog-to-Digital Converter for Low-Power DC–DC SMPS , 2008, IEEE Transactions on Power Electronics.

[16]  A. Prodic,et al.  Multimode digital SMPS controller IC for low-power management , 2006, 2006 IEEE International Symposium on Circuits and Systems.

[17]  Seth R. Sanders,et al.  Converter IC for Cellular Phone Applications , 2004 .

[18]  Dragan Maksimovic,et al.  Control method for low-voltage DC power supply in battery-powered systems with power management , 1997, PESC97. Record 28th Annual IEEE Power Electronics Specialists Conference. Formerly Power Conditioning Specialists Conference 1970-71. Power Processing and Electronic Specialists Conference 1972.

[19]  O. Trescases.  A Digitally Controlled DC-DC Converter Module with a Segmented Output Stage for Optimized Efficiency , 2007, Proceedings of the International Symposium on Power Semiconductor Devices & ICs.

[20]  D. Maksimovic,et al.  Digital PWM/PFM controller with input voltage feed-forward for synchronous buck converters , 2008, 2008 Twenty-Third Annual IEEE Applied Power Electronics Conference and Exposition.

[21]  V. Mayega,et al.  A high efficiency ultra-deep sub-micron DC-DC converter for microprocessor applications , 2004, 2004 Proceedings of the 16th International Symposium on Power Semiconductor Devices and ICs.

[22]  Ke-Horng Chen,et al.  Dithering Skip Modulator with a Novel Load Sensor for Ultra-wide-load High-Efficiency DC-DC Converters , 2006, ISLPED'06 Proceedings of the 2006 International Symposium on Low Power Electronics and Design.

[23]  V. Yousefzadeh,et al.  Hybrid DPWM with Digital Delay-Locked Loop , 2006, 2006 IEEE Workshops on Computers in Power Electronics.

[24]  V. Yousefzadeh,et al.  Nonuniform A/D Quantization for ImprovedDynamic Responses of Digitally ControlledDC–DC Converters , 2008, IEEE Transactions on Power Electronics.

[25]  Dragan Maksimovic,et al.  Feed-forward pulse-width modulators for switching power converters , 1995 .

[26]  E. Meyer,et al.  A Digital Two-Switching-Cycle Compensation Algorithm for Input-Voltage Transients in DC–DC Converters , 2009, IEEE Transactions on Power Electronics.

[27]  Aleksandar Prodic,et al.  High-frequency digital PWM controller IC for DC-DC converters , 2003 .

[28]  L. Pinola,et al.  Optimal feed-forward compensation for PWM DC/DC converters , 1990 .

[29]  Dragan Maksimovic,et al.  Sensorless optimization of dead times in dc–dc converters with synchronous rectifiers , 2006, IEEE Transactions on Power Electronics.

[30]  V. Yousefzadeh,et al.  Proximate Time-Optimal Digital Control for Synchronous Buck DC–DC Converters , 2008, IEEE Transactions on Power Electronics.

[31]  A. Patra,et al.  Self oscillating control of a synchronous DC-DC buck converter , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[32]  T. Suntio,et al.  Dynamic performance of buck converter with input voltage feedforward control , 2005, 2005 European Conference on Power Electronics and Applications.

[33]  A.V. Peterchev,et al.  Digital Multimode Buck Converter Control With Loss-Minimizing Synchronous Rectifier Adaptation , 2006, IEEE Transactions on Power Electronics.

[34]  Narisi Wang,et al.  A digitally controlled DC/DC converter for an RF power amplifier , 2006, IEEE Transactions on Power Electronics.