User's Guide
SLVU641–January 2012
TPS54120EVM, Low Noise 1A Power Supply Evaluation
Module
This User’s Guide describes operational use of the TPS54120 Evaluation Module (PWR103) as a
reference design for engineering demonstration and evaluation of the TPS54120, low noise 1A power
supply. Included in this user’s guide are setup and operation instructions, a schematic diagram, layout
description, a bill of materials, and test results.
Contents
1
2
Background .................................................................................................................. 2
Setup ......................................................................................................................... 2
2.1
2.2
2.3
Input and Output Connections and Jumper Descriptions ..................................................... 2
Modifications ........................................................................................................ 3
Equipment Interconnect ........................................................................................... 4
3
4
Operation ..................................................................................................................... 4
Test Results ................................................................................................................. 4
4.1
4.2
4.3
4.4
4.5
4.6
Output Voltage Ripple ............................................................................................. 5
Output Noise ........................................................................................................ 5
Output Turn On ..................................................................................................... 6
Load Transient ..................................................................................................... 7
Efficiency ............................................................................................................ 8
Thermal Characteristic ............................................................................................ 8
5
Board Layout ................................................................................................................ 9
5.1
Schematic .................................................................................................................. 12
Bill of Materials ............................................................................................................. 13
Layout Description ................................................................................................. 9
6
7
List of Figures
1
Output Voltage of Both the SW and LDO with 400mA Load..........................................................
Output Spectrum Noise Density vs. Frequency ........................................................................
Switcher Converter Output Voltage Turn-on, SW Enable ............................................................
LDO Output Voltage Turn-on, LDO Enable .............................................................................
LDO Output Voltage Turn-on, SW Enable...............................................................................
TPS54120 Transient Response...........................................................................................
TPS54120 Efficiency .......................................................................................................
TPS54120 Thermal Image.................................................................................................
5
5
6
6
7
7
8
9
2
3
4
5
6
7
8
9
Top Side Silkscreen and Routing ....................................................................................... 10
Second Layer (Internal) Routing......................................................................................... 11
Third Layer (Internal) Routing............................................................................................ 11
Bottom Layer Silkscreen and Routing .................................................................................. 12
Schematic .................................................................................................................. 12
10
11
12
13
List of Tables
1
2
EVM Specifications .........................................................................................................
Sample 1% Resistor Values for Common SW Output Voltages......................................................
2
3
1
SLVU641–January 2012
TPS54120EVM, Low Noise 1A Power Supply Evaluation Module
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Copyright © 2012, Texas Instruments Incorporated
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