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Application Report
SLVA237C – May 2006 – Revised March 2007
Using TPS5410/20/30/31/50
With Aluminum/Ceramic Output Capacitors
Ning Tang .................................................................................................... High Performance Analog
ABSTRACT
As internally compensated devices, the wide input step-down SWIFT™ DC/DC
converters, including TPS5410/5420/5430/5431/5450, have the advantages of less
external part count and reduced design complexity, as well as limited output capacitor
selection. By adding a few external components into the standard circuitry, these
devices generally work well with aluminum/ceramic output capacitors. This application
report shows the step-by-step design procedures when using aluminum/ceramic output
capacitors with the wide input SWIFT™ DC/DC converters. Two design examples are
provided to better understand both procedures.
Contents
1 Introduction .......................................................................................... 2
2 Design Procedure for Aluminum Output Capacitors ........................................... 3
3 Design Procedure for Ceramic Output Capacitors ............................................. 7
4 Conclusion ......................................................................................... 11
Appendix A Related RC Networks and Their Simplified Transfer Functions ................... 12
Appendix B References ............................................................................... 13
List of Figures
1 TPS5430EVM-136 Schematic .................................................................... 2
2 Measured Loop Response for TPS5430EVM-136, Vin=10.8 V .............................. 2
3 Application Circuit 1 Using Aluminum Output Capacitor ...................................... 3
4 Measured Loop Responses for Application Circuit 1, Io = 3 A ............................... 6
5 Measured Output Ripple for Application Circuit 1, Vin = 12 V and Vo = 5 V/3 A .......... 6
6 Measured Load Transient Response for Application Circuit 1, Vin = 12 V ................. 7
7 Application Circuit 2 Using Ceramic Output Capacitors ....................................... 7
8 Measured Loop Responses for Application Circuit 2, Io = 3 A .............................. 10
9 Measured Output Ripple for Application Circuit 2, Vin = 12 V and Vo = 5 V/3 A ......... 10
10 Measured Load Transient Response for Application Circuit 2, Vin = 12 V ................ 11
List of Tables
1 Bill of Materials for Application Circuit 1 ......................................................... 5
2 Bill of Materials for Application Circuit 2 ......................................................... 9
SWIFT is a trademark of Texas Instruments.
POSCAP, OS-CON are trademarks of Sanyo Electric Company, Ltd..
SLVA237C – May 2006 – Revised March 2007 Using TPS5410/20/30/31/50 With Aluminum/Ceramic Output Capacitors 1
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Verzeichnis
- ・ Blockdiagramm on Seite 2
- ・ Technische Daten on Seite 13
- ・ Anwendungsbereich on Seite 14
