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User's Guide
TPS543620 SWIFT™ Step-Down Converter Evaluation
Module User's Guide
This user's guide contains information for the TPS543620EVM evaluation module (BSR101) and the
TPS543620 dc/dc converter. Also included are the performance characteristics, schematic, and bill of materials
for the TPS543620EVM.
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..................................................................................................................................................19
3.8 Start-up and Shutdown with EN.......................................................................................................................................
3.9 Start-up and Shutdown with VIN......................................................................................................................................
Pre-Bias.....................................................................................................................................................22
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.................................................................................................................................................14
Regulation..................................................................................................................................................14
Regulation.................................................................................................................................................14
Regulation..................................................................................................................................................14
Response.........................................................................................................................................15
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.................................................................................................................................
SLVUBQ1A - AUGUST 2020 - REVISED MAY 2021
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ABSTRACT
Table of Contents
List of Figures
Settings..........................................................................................................16
TPS543620 SWIFT™ Step-Down Converter Evaluation Module User's Guide
Copyright © 2021 Texas Instruments Incorporated
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Summary of Contents for Texas Instruments TPS543620
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Page 1: Table Of Contents
TPS543620 SWIFT™ Step-Down Converter Evaluation Module User's Guide ABSTRACT This user’s guide contains information for the TPS543620EVM evaluation module (BSR101) and the TPS543620 dc/dc converter. Also included are the performance characteristics, schematic, and bill of materials for the TPS543620EVM. Table of Contents Introduction.....................................3 1.1 Background.................................. - Page 2 Table 5-1. TPS543620EVM Bill of Materials..........................30 Trademarks All trademarks are the property of their respective owners. TPS543620 SWIFT™ Step-Down Converter Evaluation Module User's Guide SLVUBQ1A – AUGUST 2020 – REVISED MAY 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated...
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Page 3: Introduction
1.1 Background The TPS543620 dc/dc converter is a synchronous buck converter designed to provide up to a 6-A output. The input (VIN) is rated for 4 V to 18 V. Rated input voltage and output current range for the evaluation module are... -
Page 4: Performance Characteristics Summary
= 12 V, I = 6 A, 15-minute soak 45.9 °C Max V limited by minimum on-time TPS543620 SWIFT™ Step-Down Converter Evaluation Module User's Guide SLVUBQ1A – AUGUST 2020 – REVISED MAY 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated... -
Page 5: Table 1-3. Tps543620Evm High Efficiency (U2) Performance Characteristics
89.3% IC case temperature = 12 V, I = 6 A, 15-minute soak 40.4 °C SLVUBQ1A – AUGUST 2020 – REVISED MAY 2021 TPS543620 SWIFT™ Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated... -
Page 6: Configurations And Modifications
Configurations and Modifications www.ti.com 2 Configurations and Modifications These evaluation modules are designed to provide access to the features of the TPS543620. The U2 design provides jumpers for testing different configurations. Jumper selections must be made prior to enabling the TPS543620. -
Page 7: Switching Frequency (Fsel Pin)
In the U1 design, the EN pin is floating, so only the internal UVLO of the device is used. SLVUBQ1A – AUGUST 2020 – REVISED MAY 2021 TPS543620 SWIFT™ Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated... -
Page 8: Test Setup And Results
With the maximum current limit setting, the maximum load current capability is near 8 A before the TPS543620 goes into current limit. Wire lengths must be minimized to reduce losses in the wires. -
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. SLVUBQ1A – AUGUST 2020 – REVISED MAY 2021 TPS543620 SWIFT™ Step-Down Converter Evaluation Module User's Guide Submit Document Feedback 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 TPS543620 SWIFT™ Step-Down Converter Evaluation Module User's Guide SLVUBQ1A – AUGUST 2020 – REVISED MAY 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated... -
Page 11: Efficiency
PGND reference test point for both input and output PGND_EFF_U2 TP17 voltages Kelvin connected near U2 SLVUBQ1A – AUGUST 2020 – REVISED MAY 2021 TPS543620 SWIFT™ Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated... - Page 12 = 9 V = 1 V Figure 3-4. U2 Efficiency – 1-V Output with Different Switching Frequencies TPS543620 SWIFT™ Step-Down Converter Evaluation Module User's Guide SLVUBQ1A – AUGUST 2020 – REVISED MAY 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated...
- Page 13 Figure 3-5. U2 Efficiency – 1-V Output and Low Current Limit with Different Switching Frequencies SLVUBQ1A – AUGUST 2020 – REVISED MAY 2021 TPS543620 SWIFT™ Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated...
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Page 14: Output Voltage Regulation
Input Voltage (V) Output Current (A) Figure 3-9. U2 Line Regulation Figure 3-8. U2 Load Regulation TPS543620 SWIFT™ Step-Down Converter Evaluation Module User's Guide SLVUBQ1A – AUGUST 2020 – REVISED MAY 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated... -
Page 15: Load Transient And Loop Response
1000000 Frequency (Hz) Frequency (Hz) Figure 3-12. U1 Bode Plot Figure 3-13. U2 Bode Plot SLVUBQ1A – AUGUST 2020 – REVISED MAY 2021 TPS543620 SWIFT™ Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated... -
Page 16: 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 TPS543620 SWIFT™ Step-Down Converter Evaluation Module User's Guide SLVUBQ1A – AUGUST 2020 – REVISED MAY 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated... -
Page 17: Output Voltage Ripple
Figure 3-18. U2 Output Ripple – No Load Figure 3-19. U2 Output Ripple – 6-A Load SLVUBQ1A – AUGUST 2020 – REVISED MAY 2021 TPS543620 SWIFT™ Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated... -
Page 18: Input Voltage Ripple
Time (1 µs/div) Figure 3-22. U2 Input Ripple – No Load Figure 3-23. U2 Input Ripple – 6-A Load TPS543620 SWIFT™ Step-Down Converter Evaluation Module User's Guide SLVUBQ1A – AUGUST 2020 – REVISED MAY 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated... -
Page 19: Synchronizing To A Clock
1-MHz were sent to the SYNC testpoint on the EVM. In this waveform, after four pulses, the TPS543620 begins synchronizing to the clock. After the clock goes away, the TPS543620 switches at 70% of the internal clock frequency for four pulses then transitions back to the normal internal clock frequency. There is only a small variation in the output voltage during these transitions. -
Page 20: Start-Up And Shutdown With En
When the EN voltage is increased above the enable-threshold voltage, the start-up sequence begins and the output voltage ramps up to the externally set value. In Figure 3-27, the external function generator pulls EN to ground and the TPS543620 shuts down. Figure 3-28 shows EN start-up with a 0.2-Ω resistor load. Figure 3-29 shows the BP5 internal LDO start-up relative to the EN pin. -
Page 21: Start-Up And Shutdown With Vin
In Figure 3-31, the VIN voltage ramps down and the TPS543620 shuts down when the input or EN pin voltage reach their respective UVLO threshold. The rate at which VIN ramps down changes as soon as the TPS543620 is disabled because it is no longer loading the input supply. -
Page 22: 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 TPS543620 SWIFT™ Step-Down Converter Evaluation Module User's Guide SLVUBQ1A – AUGUST 2020 – REVISED MAY 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated... -
Page 23: Hiccup Current Limit
TPS543620 entering hiccup with an overload on the output and the High current limit setting with a longer timescale. The TPS543620 tries to restart after the Hiccup wait time period but the overload was still present on the output. In the next restart attempt, the overload has been removed so the TPS543620 starts up normally. -
Page 24: Overvoltage Protection
FB pin with a function generator through the VO_ADJ test point. The VO_ADJ test point is initially equal to the reference voltage of 0.5 V and is stepped up to 3.3 V. The TPS543620 attempts to restart immediately after the OVP fault is cleared. -
Page 25: Thermal Performance
Test Setup and Results 3.13 Thermal Performance Figure 3-39 through Figure 3-42 show the temperature rise of the TPS543620 ICs at full 6-A load. Figure 3-39 Figure 3-40 have only one TPS543620 on and loaded. Figure 3-41 Figure 3-42 have both TPS543620s loaded. -
Page 26: Board Layout
The mid layer 2 contains a VIN copper area to connect both TPS543620 circuits to the input terminals. There is also a VIN copper area beneath each IC to connect its VIN pins together with a low impedance connection. This layer also has the trace to connect the FB divider to the output. -
Page 27: Schematic And Bill Of Materials
5 Schematic and Bill of Materials This section presents the TPS543620EVM schematic and bill of materials. SLVUBQ1A – AUGUST 2020 – REVISED MAY 2021 TPS543620 SWIFT™ Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated... -
Page 28: Schematic
FSEL_U1 TP10 VOUT_U1 SN74AHC1G125DCKR VOUT_U1 49.9 BUFF_VCC PGND SN74AHC1G125DCKR 0.1uF PGND Figure 5-1. U1 Schematic TPS543620 SWIFT™ Step-Down Converter Evaluation Module User's Guide SLVUBQ1A – AUGUST 2020 – REVISED MAY 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 SLVUBQ1A – AUGUST 2020 – REVISED MAY 2021 TPS543620 SWIFT™ Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated... -
Page 30: Bill Of Materials
Yageo R19, R20 1.00 k RES, 1.00 k, 1%, 0.1 W, 0603 0603 RC0603FR-071KL Yageo TPS543620 SWIFT™ Step-Down Converter Evaluation Module User's Guide SLVUBQ1A – AUGUST 2020 – REVISED MAY 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated... -
Page 31: Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version. SLVUBQ1A – AUGUST 2020 – REVISED MAY 2021 TPS543620 SWIFT™ Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated... - Page 32 Updated user's guide title........................... • Updated the numbering format for tables, figures, and cross-references throughout the document....3 TPS543620 SWIFT™ Step-Down Converter Evaluation Module User's Guide SLVUBQ1A – AUGUST 2020 – REVISED MAY 2021 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...
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