TPS53353EVM-744 Datasheet, PDF (1/24 Pages) Texas Instruments – Synchronous Buck Converter With Eco-mode™ Control Scheme

User's Guide
SLUU521 – August 2011
Using the TPS53353EVM-744, High-Efficiency, 20-A,
Synchronous Buck Converter With Eco-mode™ Control
Scheme
The TPS53353EVM-744 evaluation module (EVM) demonstrates the TPS53353. The TPS53353 is a
D-CAP™ mode, 20-A, synchronous buck converter with integrated MOSFETs. It provides a fixed 1.5-V
output at up to 20 A from a 12-V input bus.
Contents
1 Description ................................................................................................................... 3
1.1 Typical Application ................................................................................................. 3
1.2 Features ............................................................................................................. 3
2 Electrical Performance Specifications .................................................................................... 4
3 Schematic .................................................................................................................... 5
4 Test Setup ................................................................................................................... 6
4.1 Test Equipment ..................................................................................................... 6
4.2 Recommended Test Setup ....................................................................................... 7
5 Configurations ............................................................................................................... 8
5.1 Switching Frequency Selection .................................................................................. 8
5.2 Soft-Start Selection ................................................................................................ 8
5.3 Mode Selection ..................................................................................................... 8
5.4 Enable Selection ................................................................................................... 9
6 Test Procedure .............................................................................................................. 9
6.1 Line/Load Regulation and Efficiency Measurement Procedure .............................................. 9
6.2 Control Loop Gain and Phase Measurement Procedure ..................................................... 9
6.3 Test Point List ..................................................................................................... 10
6.4 Equipment Shutdown ............................................................................................ 10
7 Performance Data and Typical Characteristic Curves ................................................................ 11
7.1 Efficiency .......................................................................................................... 11
7.2 Load Regulation .................................................................................................. 11
7.3 Load Regulation .................................................................................................. 12
7.4 Enable Turnon/ Turnoff .......................................................................................... 12
7.5 Output Ripple ..................................................................................................... 13
7.6 Switching Node ................................................................................................... 13
7.7 Output Transient With Auto-Skip Mode ........................................................................ 14
7.8 Output Transient With FCCM Mode ........................................................................... 14
7.9 Output 0.75-V Prebias Turnon .................................................................................. 15
7.10 Output Overcurrent and Short-Circuit Protection ............................................................. 15
7.11 Bode Plot .......................................................................................................... 16
7.12 Thermal Image .................................................................................................... 17
8 EVM Assembly Drawing and PCB Layout ............................................................................. 18
9 Bill of Materials ............................................................................................................. 22
List of Figures
1 TPS53353EVM-744 Schematic ........................................................................................... 5
2 Tip and Barrel Measurement for Vout Ripple ........................................................................... 6
Eco-mode, D-CAP are trademarks of Texas Instruments.
SLUU521 – August 2011
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Using the TPS53353EVM-744, High-Efficiency, 20-A, Synchronous Buck
1
Converter With Eco-mode™ Control Scheme
Copyright © 2011, Texas Instruments Incorporated