Designing Switching Voltage Regulators With TL497A
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1 Application Report SLVA143 - September 2003 Designing Switching Voltage Regulators With TL497A John Spencer and Eugene J. Tobaben Linear Products Department ABSTRACT Switching voltage regulators, represented by the TL497, can achieve high-efficiency power conversion at large input/output voltage differentials. The TL497A eliminates complex circuit designs previously required and provides greater efficiency than systems using series pass regulators. The principle of operation is discussed, and practical design exercises for step-down, step-up, and inverting regulators are provided. Contents Introduction Principle of Operation The TL497A General Programming Oscillator Current Limiting Pass Transistor Catch Diode Enable Circuitry Design and Operation of a Step-Down Switching Voltage Regulator Summary A Step-Down Switching Regulator Design Exercise With TL497A Design and Operation of a Step-Up Switching Voltage Regulator A Step-Up Switching Regulator Design Exercise With TL497A Design and Operation of Switching Voltage Regulator in Inverting Configuration An Inverting Regulator Design Exercise With TL497A Special TL497A Circuits Design Variations For Improved Performance Extended Voltage Operation Low Voltage Operation Switching Regulator Design Tips Inductor Sources Appendix List of Figures Figure 1. Step-Down Switching Voltage Regulator Figure 2. TL497A Block Diagram
2 Figure 3. C t Voltage Waveform Figure 4. Typical C t Voltage Waveform During Start-Up and Quiescent Operation Figure 5. C t Voltage Waveform Figure 6. Basic Step-Down Regulator Figure 7. Inductor Current Waveform Figure 8. Inductor Current and Capacitor Current Waveform Figure 9. Capacitor Current Waveform ( Q+) Figure 10. Capacitor Current Waveform ( Q ) Figure 11. Capacitor Current Waveform (Continuous Mode) Figure 12. Basic Step-Down Regulator Figure Volt to 5 Volt Switching Regulator for Output Currents to 200 ma Figure 14. Curcuit Performance Waveforms Figure 15. Techniques for Obtaining Peak Currents Greater Than 500 ma Figure 16. TL497A in High-Voltage-High-Current Applications Figure 17. TL497A Logic Array Power Supply, Step-Down Circuit Figure 18. Step-Down Regulator Figure 19. Basic Step-Up Regulator Circuit Figure 20. Inductor and Capacitor Step-Up Regulator Figure 21. Basic Step-Up Regulator Using the TL497A Figure Volt to 15 Volt Switching Regulator Figure 23. TL497A Step-Up Circuit, 5V Input to 80 ma Output Figure 24. Basic Inverting Regulator Circuit Figure 25. Basic Inverting Regulator Figure Volt to 5 Volt Switching Regulator Figure V to 8.5V Step-Up/Down Circuit Figure 28. TL497A Dual Supply +12 Volts and 12 Volts From +5 Volts Figure 29. Basic Regulator Architectures Figure 30(a). Step-Down Regulator Figure 30(b). TL497A With External PNP Switch For Improved Performance Figure 31. C T Waveforms Figure 32. Basic Regulator With Feedback Diodes Figure Figure Figure List of Tables Table 1. TL497A Operation From a 5V Supply Table 2. TL497A Operation From a 12V Supply Designing Switching Voltage Regulators With TL497A
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