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User's Guide
SLVU192A – February 2007 – Revised March 2008
Using the TPS40077EVM-001 12-V Input, 1.8-V Output,
10-A Synchronous Buck Converter
The TPS40077EVM-001 evaluation module (EVM) is a synchronous buck converter providing a fixed
1.8-V output at up to 10 A from a 12-V input bus. The EVM is designed to start up from a single supply; no
additional bias voltage is required for start-up. The TPS40077 Reduced Pin Count Synchronous Buck
Controller used in the EVM employs predictive gate drive. This feature provides improved efficiency by
eliminating shoot-through switching current,and minimizing the reverse-conduction time of the
synchronous rectifier FET.
Contents
1 Introduction ................................................................................................................... 2
2 TPS40077EVM-001 Electrical Performance Specifications ............................................................ 3
3 Schematic ..................................................................................................................... 4
4 TPS40077EVM Typical Performance Data and Characteristic Curves ............................................... 8
5 EVM Assembly Drawings and Layout ................................................................................... 12
6 List of Materials ............................................................................................................. 14
List of Figures
1 TPS40077EVM-001 Schematic ............................................................................................ 4
2 Output Ripple Measurement – Tip and Barrel Using TP9 and TP10 ................................................. 6
3 TPS40077EVM-001 Recommended Test Set-Up ....................................................................... 7
4 Control Loop Measurement Setup ......................................................................................... 7
5 TPS40077EVM-001 Efficiency ............................................................................................. 8
6 TPS40077EVM-001 Line and Load Regulation .......................................................................... 9
7 TPS40077EVM-001 Typical Output Ripple ............................................................................... 9
8 Load Transient, 2 A to 10 A .............................................................................................. 10
9 Load Transient, 10 A to 2 A ............................................................................................... 10
10 Typical Bode Plot ........................................................................................................... 11
11 TPS40077EVM-001 Component Placement (Viewed from Top) .................................................... 12
12 TPS40077EVM-001 Top Copper (Viewed from Top) .................................................................. 13
13 TPS40077EVM-001 Bottom Copper (X-Ray View from Top) ........................................................ 13
List of Tables
1 TPS40077EVM-001 Electrical and Performance Specifications....................................................... 3
2 Adjusting V
OUT
With R3 ..................................................................................................... 5
3 Bill of Materials ............................................................................................................. 14
SLVU192A – February 2007 – Revised March 2008 Using the TPS40077EVM-001 12-V Input, 1.8-V Output, 1
10-A Synchronous Buck Converter
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