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User's Guide
TPS543820EVM SWIFT™ Step-Down Converter Evaluation
Module User's Guide
This user's guide contains information for the TPS543820EVM evaluation module (BSR101) and the
TPS543820 dc/dc converter. Also included are the performance characteristics, schematic, and bill of materials
for the TPS543820EVM.
1
Introduction.............................................................................................................................................................................3
1.1 Background........................................................................................................................................................................
1.2 Before You Begin...............................................................................................................................................................
1.3 Performance Characteristics Summary.............................................................................................................................
Modifications.........................................................................................................................................6
2.1 Output Voltage...................................................................................................................................................................
2.2 Switching Frequency (FSEL Pin).......................................................................................................................................
2.3 Current Limit, Soft-Start Time, and Internal Compensation (MODE Pin)...........................................................................
UVLO................................................................................................................................................................7
3 Test Setup and Results..........................................................................................................................................................
3.1 Input/Output Connections..................................................................................................................................................
3.2 Efficiency..........................................................................................................................................................................
3.3 Output Voltage Regulation...............................................................................................................................................
3.4 Load Transient and Loop Response................................................................................................................................
3.5 Output Voltage Ripple......................................................................................................................................................
3.6 Input Voltage Ripple.........................................................................................................................................................
Clock..................................................................................................................................................18
3.8 Start-up and Shutdown with EN.......................................................................................................................................
3.9 Start-up and Shutdown with VIN......................................................................................................................................
Pre-Bias.....................................................................................................................................................21
3.11 Hiccup Current Limit.......................................................................................................................................................
Protection...................................................................................................................................................24
3.13 Thermal Performance....................................................................................................................................................
Layout.........................................................................................................................................................................26
4.1 Layout..............................................................................................................................................................................
Materials...........................................................................................................................................27
5.1 Schematic........................................................................................................................................................................
Materials.................................................................................................................................................................30
6 Revision History...................................................................................................................................................................
Regulation.................................................................................................................................................13
Regulation..................................................................................................................................................13
Regulation.................................................................................................................................................13
Regulation..................................................................................................................................................13
Response.........................................................................................................................................14
Figure 3-11. U2 Transient Response.........................................................................................................................................
Figure 3-12. U1 Bode Plot.........................................................................................................................................................
Figure 3-13. U2 Bode Plot.........................................................................................................................................................
Figure 3-15. U2 Loop Phase with Different Ramp Settings.......................................................................................................
Figure 3-16. U1 Output Ripple - No Load.................................................................................................................................
SLUUCE9A - DECEMBER 2020 - REVISED APRIL 2021
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ABSTRACT
Table of Contents
List of Figures
Settings..........................................................................................................15
Copyright © 2021 Texas Instruments Incorporated
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Summary of Contents for Texas Instruments TPS543820EVM
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Page 1: Table Of Contents
TPS543820EVM SWIFT™ Step-Down Converter Evaluation Module User's Guide ABSTRACT This user’s guide contains information for the TPS543820EVM evaluation module (BSR101) and the TPS543820 dc/dc converter. Also included are the performance characteristics, schematic, and bill of materials for the TPS543820EVM. Table of Contents Introduction.....................................3... - Page 2 Figure 5-2. U2 Schematic................................List of Tables Table 1-1. Input Voltage and Output Current Summary.......................3 Table 1-2. TPS543820EVM Small Size (U1) Performance Characteristics Summary..............Table 1-3. TPS543820EVM High Efficiency (U2) Performance Characteristics Summary............5 Table 2-1. VOUT Selection................................Table 2-2. FSEL Selection................................
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Page 3: Introduction
The following warnings and cautions are noted for the safety of anyone using or working close to the TPS543820EVM. Observe all safety precautions. The TPS543820EVM may become hot during operation due to dissipation of power in some operating conditions. Avoid contact with the board. Follow all applicable Warning safety procedures applicable to your laboratory. -
Page 4: Performance Characteristics Summary
Introduction www.ti.com 1.3 Performance Characteristics Summary A summary of the TPS543820EVM performance characteristics is provided in Table 1-2 Table 1-3. The TPS543820EVM is designed and tested for V = 4 V to 18 V. Characteristics are given for an input voltage of V = 12 V and an output voltage of 1.0 V, unless otherwise specified. -
Page 5: Table 1-3. Tps543820Evm High Efficiency (U2) Performance Characteristics
Introduction Table 1-3. TPS543820EVM High Efficiency (U2) Performance Characteristics Summary SPECIFICATION TEST CONDITIONS UNIT voltage range = 12 V, I = 0 A Input current = 5 V, I = 8 A 1.90 start voltage Set by EN pin resistor divider 4.53... -
Page 6: Configurations And Modifications
1.507 V 7 to 8 pin shorted (R26+R20)||R21 = 1.92 kΩ 1.803 V Default Setting TPS543820EVM SWIFT™ Step-Down Converter Evaluation Module User's SLUUCE9A – DECEMBER 2020 – REVISED APRIL 2021 Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated... -
Page 7: Switching Frequency (Fsel Pin)
UVLO. In the U1 design, the EN pin is floating, so only the internal UVLO of the device is used. SLUUCE9A – DECEMBER 2020 – REVISED APRIL 2021 TPS543820EVM SWIFT™ Step-Down Converter Evaluation Module User's Submit Document Feedback Guide... -
Page 8: Test Setup And Results
U2 with TP17 as the ground reference. If modifications are made to the TPS543820EVM, the input current may change. The input power supply and wires connecting the EVM to the power supply must be rated for the input current. -
Page 9: Table 3-1. Connectors And Jumpers
2-2. MODE Select MODE selection header. Use shunt to select MODE resistor. See Table 2-3. SLUUCE9A – DECEMBER 2020 – REVISED APRIL 2021 TPS543820EVM SWIFT™ Step-Down Converter Evaluation Module User's Submit Document Feedback Guide Copyright © 2021 Texas Instruments Incorporated... -
Page 10: Table 3-2. Test Points
TP33 PGND Both PGND test point for load transient circuit TP34 MODE MODE test point TPS543820EVM SWIFT™ Step-Down Converter Evaluation Module User's SLUUCE9A – DECEMBER 2020 – REVISED APRIL 2021 Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated... -
Page 11: Efficiency
3.2 Efficiency Figure 3-1 through Figure 3-5 show the efficiency for both designs on the TPS543820EVM. Using the selection jumpers for U2, the results for different output voltage and switching frequency combinations are included. The test points listed in Table 3-3 are used for the efficiency measurement. - Page 12 Different Switching Frequencies = 12 V = 1.8 V Figure 3-5. U2 Efficiency – 1.8-V Output with Different Switching Frequencies TPS543820EVM SWIFT™ Step-Down Converter Evaluation Module User's SLUUCE9A – DECEMBER 2020 – REVISED APRIL 2021 Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated...
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Page 13: Output Voltage Regulation
Figure 3-6. U1 Load Regulation Figure 3-9. U2 Line Regulation Figure 3-8. U2 Load Regulation SLUUCE9A – DECEMBER 2020 – REVISED APRIL 2021 TPS543820EVM SWIFT™ Step-Down Converter Evaluation Module User's Submit Document Feedback Guide Copyright © 2021 Texas Instruments Incorporated... -
Page 14: Load Transient And Loop Response
U1 and TP29 for U2. When using the load transient circuit included on the TPS543820EVM, slowly increase amplitude of function generator for desired load step amplitude then vary the rise and fall times for the desired slew rate. The current for the load step can be sensed with the ISNS test point. -
Page 15: Figure 3-14. U2 Loop Gain With Different Ramp Settings
Figure 3-15. U2 Loop Phase with Different Ramp Figure 3-14. U2 Loop Gain with Different Ramp Settings Settings SLUUCE9A – DECEMBER 2020 – REVISED APRIL 2021 TPS543820EVM SWIFT™ Step-Down Converter Evaluation Module User's Submit Document Feedback Guide Copyright © 2021 Texas Instruments Incorporated... -
Page 16: Output Voltage Ripple
Figure 3-16 through Figure 3-19 show the TPS543820EVM output voltage ripple. The load currents are no load and 6 A. V = 12 V. The VOUT voltage is measured using TP10 for U1 and TP29 for U2. VOUT AC (10 mV/div) -
Page 17: Input Voltage Ripple
Figure 3-20 through Figure 3-23 show the TPS543820EVM input voltage ripple. The load currents are no load and 6 A. V = 12 V. The ripple voltage is measured across C1 for U1 and measured across C13 for U2. VIN AC (50 mV/div) -
Page 18: Synchronizing To A Clock
Time (1 µs/div) Time (4 µs/div) Figure 3-24. U1 and U2 Synchronized to a Clock Figure 3-25. U2 Clock Synchronization Transitions TPS543820EVM SWIFT™ Step-Down Converter Evaluation Module User's SLUUCE9A – DECEMBER 2020 – REVISED APRIL 2021 Guide Submit Document Feedback... -
Page 19: Start-Up And Shutdown With En
Figure 3-28. U2 Start-up with EN – 0.2-Ω Load Figure 3-29. U2 Startup with EN – No Load and Measuring BP5 SLUUCE9A – DECEMBER 2020 – REVISED APRIL 2021 TPS543820EVM SWIFT™ Step-Down Converter Evaluation Module User's Submit Document Feedback Guide Copyright © 2021 Texas Instruments Incorporated... -
Page 20: Start-Up And Shutdown With Vin
Time (1 ms/div) Figure 3-30. U2 Start-up with VIN – 0.3-Ω Load Figure 3-31. U2 Shutdown with VIN – 0.3-Ω Load TPS543820EVM SWIFT™ Step-Down Converter Evaluation Module User's SLUUCE9A – DECEMBER 2020 – REVISED APRIL 2021 Guide Submit Document Feedback... -
Page 21: Start-Up Into Pre-Bias
VOUT (500 mV/div) PGOOD (5 V/div) Time (400 µs/div) Figure 3-32. U2 Start-up Into 0.5-V Pre-Bias SLUUCE9A – DECEMBER 2020 – REVISED APRIL 2021 TPS543820EVM SWIFT™ Step-Down Converter Evaluation Module User's Submit Document Feedback Guide Copyright © 2021 Texas Instruments Incorporated... -
Page 22: Hiccup Current Limit
Figure 3-35. U2 Output Overcurrent Protection – Figure 3-36. U2 Output Overcurrent Protection – Short with High Limit Short with Low Limit TPS543820EVM SWIFT™ Step-Down Converter Evaluation Module User's SLUUCE9A – DECEMBER 2020 – REVISED APRIL 2021 Guide Submit Document Feedback... -
Page 23: Figure 3-37. U2 Ocp Hiccup And Recover - High Limit
Test Setup and Results Figure 3-37. U2 OCP Hiccup and Recover – High Limit SLUUCE9A – DECEMBER 2020 – REVISED APRIL 2021 TPS543820EVM SWIFT™ Step-Down Converter Evaluation Module User's Submit Document Feedback Guide Copyright © 2021 Texas Instruments Incorporated... -
Page 24: Overvoltage Protection
Time (10 µs/div) Time (200 µs/div) Figure 3-38. U2 Overvoltage Protection Figure 3-39. U2 OVP and Recover TPS543820EVM SWIFT™ Step-Down Converter Evaluation Module User's SLUUCE9A – DECEMBER 2020 – REVISED APRIL 2021 Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated... -
Page 25: Thermal Performance
Figure 3-42. U1 Thermal Performance – Both 8-A Figure 3-43. U2 Thermal Performance – Both 8-A Load Load SLUUCE9A – DECEMBER 2020 – REVISED APRIL 2021 TPS543820EVM SWIFT™ Step-Down Converter Evaluation Module User's Submit Document Feedback Guide Copyright © 2021 Texas Instruments Incorporated... -
Page 26: Board Layout
Board Layout www.ti.com 4 Board Layout This section provides a description of the TPS543820EVM board layout and layer illustrations. 4.1 Layout The board layout for the TPS543820EVM is shown in Figure 4-1 through Figure 4-6. The top-side layer of the EVM is laid out in a manner typical of a user application. -
Page 27: Schematic And Bill Of Materials
Figure 4-5. Mid Layer 2 Layout Figure 4-6. Bottom Layer Layout 5 Schematic and Bill of Materials This section presents the TPS543820EVM schematic and bill of materials. SLUUCE9A – DECEMBER 2020 – REVISED APRIL 2021 TPS543820EVM SWIFT™ Step-Down Converter Evaluation Module User's... -
Page 28: Schematic
49.9 SN74AHC1G125DCKR PGND 100k ENSYNC_U1 PGND BP5_U1 BUFF_VCC_U1 SN74AHC1G125DCKR 0.1uF PGND Figure 5-1. U1 Schematic TPS543820EVM SWIFT™ Step-Down Converter Evaluation Module User's Guide SLUUCE9A – DECEMBER 2020 – REVISED APRIL 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated... -
Page 29: Figure 5-2. U2 Schematic
5-6 = 11.3 k = 6A, 1ms, 4pF 7-8 = 60.4 k = 4A, 1ms, 2pF AGND Figure 5-2. U2 Schematic SLUUCE9A – DECEMBER 2020 – REVISED APRIL 2021 TPS543820EVM SWIFT™ Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated... -
Page 30: Bill Of Materials
Schematic and Bill of Materials www.ti.com 5.2 Bill of Materials Table 5-1 presents the bill of materials for the TPS543820EVM. Table 5-1. TPS543820EVM Bill of Materials Designator Quantit Value Description PackageReference PartNumber Manufacturer !PCB1 Printed Circuit Board BSR101 BO1, BO2, BO3, BO4 Bumpon, Hemisphere, 0.375 X... - Page 31 Schematic and Bill of Materials Table 5-1. TPS543820EVM Bill of Materials (continued) Designator Quantit Value Description PackageReference PartNumber Manufacturer R19, R20 1.00k RES, 1.00 k, 1%, 0.1 W, 0603 0603 RC0603FR-071KL Yageo 8.25k RES, 8.25 k, 1%, 0.1 W, 0603...
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Page 32: Revision History
Changes from Revision * (December 2020) to Revision A (April 2021) Page • Updated user's guide title........................... TPS543820EVM SWIFT™ Step-Down Converter Evaluation Module User's SLUUCE9A – DECEMBER 2020 – REVISED APRIL 2021 Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated... - Page 33 STANDARD TERMS FOR EVALUATION MODULES Delivery: TI delivers TI evaluation boards, kits, or modules, including any accompanying demonstration software, components, and/or documentation which may be provided together or separately (collectively, an “EVM” or “EVMs”) to the User (“User”) in accordance with the terms set forth herein.
- Page 34 www.ti.com Regulatory Notices: 3.1 United States 3.1.1 Notice applicable to EVMs not FCC-Approved: FCC NOTICE: This kit is designed to allow product developers to evaluate electronic components, circuitry, or software associated with the kit to determine whether to incorporate such items in a finished product and software developers to write software applications for use with the end product.
- Page 35 www.ti.com Concernant les EVMs avec antennes détachables Conformément à la réglementation d'Industrie Canada, le présent émetteur radio peut fonctionner avec une antenne d'un type et d'un gain maximal (ou inférieur) approuvé pour l'émetteur par Industrie Canada. Dans le but de réduire les risques de brouillage radioélectrique à...
- Page 36 www.ti.com EVM Use Restrictions and Warnings: 4.1 EVMS ARE NOT FOR USE IN FUNCTIONAL SAFETY AND/OR SAFETY CRITICAL EVALUATIONS, INCLUDING BUT NOT LIMITED TO EVALUATIONS OF LIFE SUPPORT APPLICATIONS. 4.2 User must read and apply the user guide and other available documentation provided by TI regarding the EVM prior to handling or using the EVM, including without limitation any warning or restriction notices.
- Page 37 Notwithstanding the foregoing, any judgment may be enforced in any United States or foreign court, and TI may seek injunctive relief in any United States or foreign court. Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2019, Texas Instruments Incorporated...
- Page 38 TI products. TI’s provision of these resources does not expand or otherwise alter TI’s applicable warranties or warranty disclaimers for TI products.IMPORTANT NOTICE Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2021, Texas Instruments Incorporated...