User’s Guide
LM5157EVM-BST Evaluation Module
ABSTRACT
The LM5157EVM-BST evaluation module showcases the features and performance of the LM5157 device
as wide input voltage, non-synchronous boost converter with dual random spread spectrum. The standard
configuration is designed to provide a regulated output of 12 V at 1.6 A from an input of 3 V to 9 V (load derated
for input voltages below 6 V), switching at a frequency of 2.1 MHz.
Table of Contents
1 Features and Electrical Performance................................................................................................................................... 3
2 Application Schematic........................................................................................................................................................... 5
3 EVM Picture.............................................................................................................................................................................6
4 Test Setup and Procedure......................................................................................................................................................7
5 Test Results.............................................................................................................................................................................8
6 Design Files...........................................................................................................................................................................14
7 Revision History................................................................................................................................................................... 18
List of Figures
Figure 2-1. Application Circuit......................................................................................................................................................5
Figure 3-1. EVM Picture.............................................................................................................................................................. 6
Figure 4-1. Test Setup................................................................................................................................................................. 7
Figure 5-1. Efficiency vs Load......................................................................................................................................................8
Figure 5-2. Load Regulation........................................................................................................................................................ 8
Figure 5-3. Thermal Image VIN = 3 V IOUT = 0.6 A, VBIAS = VIN, no Forced Air Cooling..............................................................9
Figure 5-4. Thermal Image VIN = 3 V IOUT = 0.6 A, VBIAS = 12 V, no Forced Air Cooling............................................................ 9
Figure 5-5. Thermal Image VIN = 6 V IOUT = 1.6 A, VBIAS = VIN, no Forced Air Cooling..............................................................9
Figure 5-6. Thermal Image VIN = 9 V IOUT = 1.6 A, VBIAS = VIN, no Forced Air Cooling..............................................................9
Figure 5-7. Steady State, VIN = 3 V, IOUT = 0.6 A...................................................................................................................... 10
Figure 5-8. Steady State, VIN = 6 V, IOUT = 1.6 A...................................................................................................................... 10
Figure 5-9. Steady State, VIN = 9 V, IOUT = 1.6 A...................................................................................................................... 10
Figure 5-10. Start-Up, VIN = 3 V, IOUT = 0.6 A (20 Ω).................................................................................................................11
Figure 5-11. Start-Up, VIN = 6 V, IOUT = 1.6 A (7.5 Ω)................................................................................................................ 11
Figure 5-12. Start-Up, VIN = 9 V, IOUT = 1.6 A (7.5 Ω)................................................................................................................11
Figure 5-13. Load Transient, VIN = 3 V, IOUT = 0.3 A to 0.6 A....................................................................................................12
Figure 5-14. Load Transient, VIN = 6 V, IOUT = 0.8 A to 1.6 A....................................................................................................12
Figure 5-15. Load Transient, VIN = 9 V, IOUT = 0.8 A to 1.6 A....................................................................................................12
Figure 5-16. Control Loop Response, VIN = 3 V, IOUT = 0.6 A................................................................................................... 13
Figure 5-17. Control Loop Response, VIN = 6 V, IOUT = 1.6A.................................................................................................... 13
Figure 5-18. Control Loop Response, VIN = 9 V, IOUT = 1.6 A................................................................................................... 13
Figure 6-1. Top Layer and Silkscreen........................................................................................................................................ 14
Figure 6-2. Top Layer.................................................................................................................................................................14
Figure 6-3. Signal Layer 1......................................................................................................................................................... 14
Figure 6-4. Signal Layer 2......................................................................................................................................................... 14
Figure 6-5. Bottom Layer........................................................................................................................................................... 14
Figure 6-6. Bottom Layer and Silkscreen (mirrored)..................................................................................................................14
Figure 6-7. LM5157EVM-BST Schematic..................................................................................................................................15
List of Tables
Table 1-1. Electrical Performance Standard Configuration..........................................................................................................3
Table 1-2. Jumper Description..................................................................................................................................................... 4
Table 4-1. Standard Configuration Jumper Connections............................................................................................................. 7
www.ti.com Table of Contents
SNVU739A – OCTOBER 2020 – REVISED AUGUST 2021
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