Texas Instruments TPS40345EVM-353, User Manual

Page: 1 / 23

1 SNVU588 – November 2017
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
TPS40345EVM-353 Evaluation Module
User's Guide
SNVU588 – November 2017
TPS40345EVM-353 Evaluation Module
The TPS40345EVM-353 evaluation module (EVM) is a synchronous buck converter providing a fixed
1.2-V output at up to 20 A from a 12-V input bus. The EVM is designed to start-up from a single supply,
which means no additional bias voltage is required for start-up. The module uses the TPS40345 high-
performance, mid-input voltage synchronous buck controller and TI’s NexFET™ high performance
MOSFETs.
Contents
1 Description
....................................................................................................................
3
1.1 Applications
..........................................................................................................
3
1.2 Features
..............................................................................................................
3
2 TPS40345EVM-353 Electrical Performance Specifications
............................................................
3
3 TPS40345EVM-353 Schematic
............................................................................................
4
4 Connector and Test Point Descriptions
...................................................................................
5
4.1 Enable Jumper (JP2)
...............................................................................................
5
4.2 Frequency Spread Spectrum – FSS Jumper (JP1)
............................................................
5
4.3 Test Point Descriptions
............................................................................................
5
5 Test Setup
....................................................................................................................
7
5.1 Equipment
...........................................................................................................
7
5.2 Equipment Setup
....................................................................................................
7
5.3 Start-Up/Shutdown Procedure
....................................................................................
9
5.4 Output Ripple Voltage Measurement Procedure
...............................................................
9
5.5 Control Loop Gain and Phase Measurement Procedure
......................................................
9
5.6 Equipment Shutdown
.............................................................................................
10
6 TPS40345EVM-353 Test Data
...........................................................................................
10
6.1 Efficiency
...........................................................................................................
10
6.2 Line and Load Regulation
........................................................................................
11
6.3 Output Voltage Ripple
............................................................................................
11
6.4 Switch Node
........................................................................................................
12
6.5 Control Loop Bode Diagram
.....................................................................................
12
6.6 Additional Waveforms
............................................................................................
13
7 TPS40345EVM-353 Assembly Drawings and Layout
.................................................................
13
8 TPS40345EVM-353 Bill of Materials
.....................................................................................
17
List of Figures
1 TPS40345EVM-353 Schematic
............................................................................................
4
2 TPS40345EVM-353 Recommended Test Set-Up
.......................................................................
8
3 Output Ripple Measurement – Tip and Barrel using TP3 and TP4
...................................................
8
4 Control Loop Measurement Setup
.........................................................................................
9
5 TPS40345EVM-353 Efficiency vs Load Current
.......................................................................
10
6 TPS40345EVM-353 Output Voltage vs Load Current
.................................................................
11
7 TPS40345EVM-353 Output Voltage Ripple
............................................................................
11
8 TPS40345EVM-353 Switching Waveforms
.............................................................................
12
9 TPS40345EVM-353 Gain and Phase vs Frequency
..................................................................
12
10 TPS40345EVM-353 Output Ripple With FSS Enabled
...............................................................
13
11 TPS40345EVM-353 Component Placement (Top View)
.............................................................
14