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User's Guide
SLVU356 – January 2010
Using the TPS54291EVM-431 A 12V Input, 3.3V 1.5A and
1.2V 2.5A Synchronous Buck Converter
Contents
1
Introduction
..................................................................................................................
1.1
Description
..........................................................................................................
1.2
Applications
.........................................................................................................
1.3
Features
.............................................................................................................
2
TPS54291EVM-431 Electrical Performance Specifications
...........................................................
3
Schematic
....................................................................................................................
3.1
Enable Jumpers (JP1 and JP2)
..................................................................................
3.2
Error Amplifier Outputs
............................................................................................
3.3
Test Point Descriptions
............................................................................................
4
Test Set UP
..................................................................................................................
4.1
Equipment
...........................................................................................................
4.2
Equipment Setup
...................................................................................................
4.3
Start Up / Shut Down Procedure
.................................................................................
4.4
Output Ripple Voltage Measurement Procedure
.............................................................
4.5
Control Loop Gain and Phase Measurement Procedure
....................................................
4.6
Equipment Shutdown
............................................................................................
5
TPS54291EVM-431 Typical Performance Data and Characteristic Curves
.......................................
5.1
Efficiency
..........................................................................................................
5.2
Line and Load Regulation
.......................................................................................
5.3
Switch Node and Output Ripple Voltage
......................................................................
6
EVM Assembly Drawings and Layout
..................................................................................
7
List of Materials
............................................................................................................
List of Figures
1
TPS54291EVM-431 Schematic (For Reference Only, See Table 4: Bill of Materials for Specific Values)
.....
2
TPS54291EVM-431 Recommended Test Set-Up
......................................................................
3
Output Ripple Measurement – Tip and Barrel using TP3 and TP4 or TP18 and TP19
...........................
4
Control Loop Measurement Setup
........................................................................................
5
TPS54291EVM-431 Efficiency vs Load Current
......................................................................
6
TPS54291EVM-431 Output Voltage vs Load Current
................................................................
7
TPS54291EVM-431 Output Voltage Ripple
...........................................................................
8
TPS54291EVM-431 Component Placement (Viewed from Top)
....................................................
9
TPS54291EVM-431 Silkscreen (Viewed from Top)
...................................................................
10
TPS54291EVM-431 Top Copper (Viewed from Top)
.................................................................
11
TPS54291EVM-431 Bottom Copper (X-Ray View from Top)
........................................................
12
TPS54291EVM-431 Internal 1 (X-Ray View from Top)
..............................................................
13
TPS54291EVM-431 Internal 2 (X-Ray View from Top)
..............................................................
List of Tables
1
TPS54291EVM-431 Electrical and Performance Specifications
......................................................
1
SLVU356 – January 2010
Using the TPS54291EVM-431 A 12V Input, 3.3V 1.5A and 1.2V 2.5A
Synchronous Buck Converter
Copyright © 2010, Texas Instruments Incorporated