Datasheet

User's Guide
SLVU346–January 2010
Using the TPS51218EVM-496 High-Performance, Single
Synchronous, Step–Down Controller for High-Current,
Eco-mode™ Applications
The TPS51218EVM evaluation module (EVM) is used to evaluate the TPS51218, a small-size, single buck
controller with adaptive on-time D-CAP™ mode, providing a fixed 1.2-V output at up to 20 A from a 12-V
input bus.
Contents
1 Description ................................................................................................................... 3
1.1 Typical Applications ................................................................................................ 3
1.2 Features ............................................................................................................. 3
2 Electrical Performance Specifications .................................................................................... 3
3 Schematic .................................................................................................................... 4
4 Test Setup ................................................................................................................... 5
4.1 Test Equipment ..................................................................................................... 5
4.2 Recommended Test Setup ....................................................................................... 6
5 Test Procedure .............................................................................................................. 7
5.1 Line/Load Regulation and Efficiency Measurement Procedure .............................................. 7
5.2 List of Test Points .................................................................................................. 7
5.3 Equipment Shutdown .............................................................................................. 7
6 Performance Data and Typical Characteristic Curves ................................................................. 7
6.1 Efficiency ............................................................................................................ 8
6.2 Load Regulation .................................................................................................... 8
6.3 Transient Response ............................................................................................... 9
6.4 Output Ripple ..................................................................................................... 10
6.5 Switch Node Voltage ............................................................................................. 10
6.6 Turnon Waveform ................................................................................................ 11
6.7 Turnoff Waveform ................................................................................................ 11
6.8 Output 1.1-V Prebias Turnon ................................................................................... 12
7 EVM Assembly Drawing and PCB Layout ............................................................................. 12
8 Bill of Materials ............................................................................................................. 16
List of Figures
1 TPS51218EVM Schematic ................................................................................................ 4
2 Tip and Barrel Measurement for Vout Ripple ........................................................................... 5
3 TPS51218EVM Recommended Test Setup............................................................................. 6
4 TPS51218EVM Efficiency.................................................................................................. 8
5 TPS51218 Load Regulation ............................................................................................... 8
6 TPS51218EVM Load Transient ........................................................................................... 9
7 TPS51218EVM Load Transient ........................................................................................... 9
8 Output Ripple .............................................................................................................. 10
9 Switching Node Waveform ............................................................................................... 10
10 Enable Turnon Waveform ................................................................................................ 11
Eco-mode, D-CAP are trademarks of Texas Instruments.
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SLVU346–January 2010 Using the TPS51218EVM-496 High-Performance, Single Synchronous,
Step–Down Controller for High-Current, Eco-mode™ Applications
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