Fiche : [DATA057]

Titre : E. ROGERS, SLVA061 - Understanding boost power stages in switchmode power supplies, Application report , Texas Instruments, march 1999.

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Cité dans : [DATA055] TL494, Pulse-width-modulation (PWM) control circuit, Texas Instruments.
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Lien : SLVA061.pdf - 150 Ko, 32 pages.
Date : march 1999
Site : http://www.ti.com

ABSTRACT :
Abstract : Understanding Boost Power Stages In Switchmode Power Supplies
A switching power supply consists of the power stage and the control circuit. The power stage performs the basic power conversion from the input voltage to the output voltage and includes switches and the output filter. This report addresses the boost power stage only and does not cover control circuits. The report includes detailed steady-stage and small-signal analysis of the boost power stage operating in continuous and discontinuous modes. A discussion of power stage component requirements is included.

Contents :
1 Introduction 1 .
2 Boost Power Stage Steady-State Analysis 2 .
2.1 Boost Steady-State Continuous Conduction Mode Analysis 2 .
2.2 Boost Steady-State Discontinuous Conduction Mode Analysis 7 .
2.3 Critical Inductance 10 .
3 Boost Power Stage Modeling 12 .
3.1 Boost Continuous Conduction Mode Small-Signal Analysis 13 .
3.2 Boost Discontinuous Conduction Mode Small-Signal Analysis 16 .
4 Component Selection 19 .
4.1 Output Capacitance 19 .
4.2 Output Inductance 20 .
4.3 Power Switch 21 .
4.4 Output Diode 22 .
5 Example Design 24 .

  [1] :  [DIV299]  Texas Instruments, SLVP088 - 20 V to 40 V Adjustable Boost Converter Evaluation Module User’s Guide, Application note, Texas Instruments, may 1998.

References : 10
1 : Application Report Designing With The TL5001 PWM Controller, TI Literature Number SLVA034A.
2 : Application Report Designing Fast Response Synchronous Buck Regulators Using the TPS5210, TI Literature Number SLVA044.
3 : V. Vorperian, R. Tymerski, and F. C. Lee, "Equivalent Circuit Models for Resonant and PWM Switches", IEEE Transactions on Power Electronics, Vol. 4, No. 2, pp. 205-214, April 1989.
4 : R. W. Erickson, Fundamentals of Power Electronics, New York: Chapman and Hall, 1997.
5 : V. Vorperian, "Simplified Analysis of PWM Converters Using the Model of the PWM Switch: Parts I and II", IEEE Transactions on Aerospace and Electronic Systems, Vol. AES-26, pp. 490-505, May 1990.
6 : E. van Dijk, et al., "PWM-Switch Modeling of DC-DC Converters", IEEE Transactions on Power Electronics, Vol. 10, No. 6, pp. 659-665, November 1995.
7 : G. W. Wester and R. D. Middlebrook, "Low-Frequency Characterization of Switched Dc-Dc Converters", IEEE Transactions an Aerospace and Electronic Systems, Vol. AES-9, pp. 376-385, May 1973.
8 : R. D. Middlebrook and S. Cuk, "A General Unified Approach to Modeling Switching-Converter Power Stages", International Journal of Electronics, Vol. 42, No. 6, pp. 521-550, June 1977.
9 : E. Rogers, "Control Loop Modeling of Switching Power Supplies", Proceedings of EETimes Analog and Mixed-Signal Applications Conference, July 13-14, 1998, San Jose, CA.
10 : S. Cuk, "Modelling, analysis and design of switching converters", Ph.D. dissertation, California Institute of Technology, Pasadena, CA, Nov. 1976.

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