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User's Guide
SLUU266 – January 2007
Using the TPS40040EVM-001: A 12-V Input, 1.8-V Output,
10-A Synchronous Buck Converter
Contents
1 Introduction .......................................................................................... 2
2 TPS40040EVM-001 Electrical Performance Specifications ................................... 3
3 Schematic ........................................................................................... 4
4 Test Setup ........................................................................................... 7
5 TPS40040EVM Typical Performance Data and Characteristic Curves .................... 11
6 EVM Assembly Drawings and Layout .......................................................... 14
7 List of Materials .................................................................................... 17
List of Figures
1 TPS40040EVM-001 Power Stage/Control Schematic Reference Only, See Table 4:
Bill of Materials for Specific Values .............................................................. 4
2 TPS40040EVM-001 Recommended Test Set-Up .............................................. 9
3 Output Ripple Measurement – Tip and Barrel using TP14 and TP15 ....................... 9
4 Control Loop Measurement Setup .............................................................. 10
5 TPS40040EVM-001 Efficiency Curves ......................................................... 11
6 Power Loss – TPS40040EVM-001 Line and Load Regulation .............................. 12
7 TPS40040EVM-001 Line and Load Regulation ............................................... 12
8 TPS40040EVM-001 Output Voltage Ripple ................................................... 13
9 TPS40040EVM-001 Switch Node – Switching Waveforms ................................. 13
10 TPS40040EVM-001 Switching Waveforms .................................................... 14
11 TPS40040EVM-001 Component Placement (Viewed From Top) .......................... 14
12 TPS40040EVM-001 Silkscreen (Viewed From Top) ......................................... 15
13 TPS40040EVM-001 Top Copper (Viewed From Top) ....................................... 15
14 TPS40040EVM Bottom Copper (X-Ray View From Top) .................................... 16
List of Tables
1 Adjusting V
OUT
With R7 ............................................................................ 5
2 Adjusting V
SCP
With R9 ............................................................................ 5
3 Test Point Descriptions ............................................................................ 5
4 TPS40040EVM-001 Bill of Materials ........................................................... 17
SLUU266 – January 2007 Using the TPS40040EVM-001: A 12-V Input, 1.8-V Output, 10-A Synchronous Buck Converter 1
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