Texas Instruments LM5123EVM-BST, Руководство пользователя

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User’s Guide
LM5123EVM-BST Evaluation Module
ABSTRACT
The LM5123EVM-BST evaluation module showcases the features and performance of the LM5123-Q1 wide
input voltage synchronous boost controller. The standard configuration is designed to provide a regulated output
of 24-V at 200-W, from an input voltage of 8-V to 18-V and switching at 440 kHz. The output voltage can be
dynamically up to 33-V using the TRK pin of the LM5123-Q1.
This EVM is designed for ease of configuration, enabling an user to evaluate many different applications on
the same module. Functionality includes: low I
Q
operation, internal feedback resistors, bypass mode operation
when V
IN
is greater than V
OUT
, dynamic output voltage tracking, power good (PGOOD) indicator, programmable
frequency dithering, programmable undervoltage lock out (UVLO), and overvoltage protection.
Table of Contents
1 Introduction ............................................................................................................................................................................. 3
1.1 Applications........................................................................................................................................................................ 3
1.2 Features............................................................................................................................................................................. 3
2 EVM Setup ............................................................................................................................................................................... 4
2.1 EVM Characteristics........................................................................................................................................................... 5
2.2 EVM Connectors and Test Points...................................................................................................................................... 5
2.3 EVM Configurations........................................................................................................................................................... 7
3 Test Setup and Procedures .................................................................................................................................................... 8
3.1 Equipment.......................................................................................................................................................................... 8
4 Test Results ............................................................................................................................................................................. 9
4.1 Efficiency ........................................................................................................................................................................... 9
4.2 Load Regulation .............................................................................................................................................................. 10
4.3 Thermal Performance...................................................................................................................................................... 10
4.4 Start-up Waveforms.......................................................................................................................................................... 11
4.5 Steady State Operation.................................................................................................................................................... 11
4.6 Load Transient Response................................................................................................................................................ 12
4.7 Output Voltage Tracking................................................................................................................................................... 13
5 PCB Layers ............................................................................................................................................................................ 14
6 Schematic .............................................................................................................................................................................. 16
7 Bill of Materials ..................................................................................................................................................................... 17
8 Revision History ................................................................................................................................................................... 21
List of Figures
Figure 1-1. Typical Application Circuit......................................................................................................................................... 3
Figure 2-1. EVM Photo................................................................................................................................................................ 4
Figure 2-2. Fixed Output Voltage Configuration.......................................................................................................................... 7
Figure 2-3. Variable Output Voltage Configuration ..................................................................................................................... 7
Figure 3-1. EVM Test Setup......................................................................................................................................................... 8
Figure 4-1. Efficiency: V
OUT
= 24-V............................................................................................................................................. 9
Figure 4-2. Efficiency: V
OUT
= 24-V Light Load............................................................................................................................ 9
Figure 4-3. 24-V Load Regulation.............................................................................................................................................. 10
Figure 4-4. Thermal Performance: V
IN
= 8-V, V
OUT
= 24-V P
OUT
= 200-W, No Forced Airflow................................................. 10
Figure 4-5. V
IN
= 8-V, V
OUT
= 24-V, P
OUT
= 200-W.................................................................................................................... 11
Figure 4-6. V
IN
= 10-V, V
OUT
= 24-V, P
OUT
= 200-W.................................................................................................................. 11
Figure 4-7. V
IN
= 14-V, V
OUT
= 24-V, P
OUT
= 200-W.................................................................................................................. 11
Figure 4-8. V
IN
= 18-V, V
OUT
= 24-V, P
OUT
= 200-W.................................................................................................................. 11
Figure 4-9. V
IN
= 8-V, V
OUT
= 24-V, P
OUT
= 200-W.................................................................................................................... 11
Figure 4-10. V
IN
= 10-V, V
OUT
= 24-V, P
OUT
= 200-W................................................................................................................ 11
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SNVU737A – DECEMBER 2020 – REVISED DECEMBER 2021
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