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User's Guide
TPS56121 Step-Down Converter Evaluation Module User's
Guide
1
Introduction.............................................................................................................................................................................3
2 Description..............................................................................................................................................................................
2.1
Applications........................................................................................................................................................................4
2.2 Features.............................................................................................................................................................................
3 Electrical Performance Specifications.................................................................................................................................
4
Schematic................................................................................................................................................................................6
Setup................................................................................................................................................................................7
5.1 Test Equipment..................................................................................................................................................................
5.3 Equipment Set Up Procedure............................................................................................................................................
6 Configurations........................................................................................................................................................................
6.1 Enable Selection (J3).........................................................................................................................................................
7 Test Point Descriptions........................................................................................................................................................
7.2 Output Voltage Monitoring (TP3 and TP4).......................................................................................................................
7.4 Power Good Monitoring (TP6).........................................................................................................................................
7.6 Switch Node Voltage Monitoring (TP11 and TP12)..........................................................................................................
8 Test Procedures....................................................................................................................................................................
8.1 Start Up/Shut Down Procedure........................................................................................................................................
8.2 Output Ripple Voltage Measurement Procedure..............................................................................................................
8.3 Control Loop Gain and Phase Measurement Procedure.................................................................................................
8.4 Equipment Shutdown.......................................................................................................................................................
9 Performance Data and Typical Characteristic Curves......................................................................................................
9.1
Efficiency..........................................................................................................................................................................13
9.2 Load Regulation...............................................................................................................................................................
9.3 Line Regulation................................................................................................................................................................
9.4 Output Voltage Ripple......................................................................................................................................................
9.5 Switch Node.....................................................................................................................................................................
9.6 Load Transient.................................................................................................................................................................
9.7 Start Up............................................................................................................................................................................
9.8 Power Off.........................................................................................................................................................................
9.9 Over-Current Protection...................................................................................................................................................
9.10 Control Loop Bode Plot..................................................................................................................................................
9.11 Thermal Image...............................................................................................................................................................
10 EVM Assembly Drawings and PCB Layout......................................................................................................................
Materials...................................................................................................................................................................22
12 Revision History.................................................................................................................................................................
Figure 5-1. TPS56121EVM-601 Recommended Test Setup.......................................................................................................
Figure 8-1. Tip and Barrel Output Voltage Ripple Measurement...............................................................................................
Figure 8-2. Control Loop Measurement Setup..........................................................................................................................
Figure 9-1. Efficiency.................................................................................................................................................................
Figure 9-2. Load Regulation......................................................................................................................................................
Figure 9-3. Line Regulation (VIN = 8 V to 14 V, VOUT = 1.0 V, IOUT = 15 A)..........................................................................
Figure 9-4. Output Voltage Ripple (VIN = 12 V, VOUT = 1.0 V, IOUT = 15
SLVU445C - MARCH 2011 - REVISED AUGUST 2021
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Gauge...............................................................................................................................................7
TP2)..........................................................................................................................10
(TP5)...................................................................................................................................10
TP10)........................................................................................................10
List of Figures
Schematic.................................................................................................................................6
Copyright © 2021 Texas Instruments Incorporated
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TPS56121 Step-Down Converter Evaluation Module User's Guide
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Summary of Contents for Texas Instruments TPS56121
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Page 1: Table Of Contents
Figure 9-4. Output Voltage Ripple (VIN = 12 V, VOUT = 1.0 V, IOUT = 15 A)................14 SLVU445C – MARCH 2011 – REVISED AUGUST 2021 TPS56121 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated... - Page 2 Table 11-1. TPS56121EVM-601 List of Materials........................Trademarks All trademarks are the property of their respective owners. TPS56121 Step-Down Converter Evaluation Module User's Guide SLVU445C – MARCH 2011 – REVISED AUGUST 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated...
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Page 3: Introduction
15 A from a 12-V input bus. The EVM is designed to start up from a single supply; so, no additional bias voltage is required for start up. The module uses the TPS56121 High-Current Synchronous Buck Converter with integrated MOSFETs. -
Page 4: Description
TPS56121EVM-601 is designed to use a regulated 12-V (8-V to 14-V) bus voltage to provide a regulated 1.0-V output at up to 15 A of load current. TPS56121EVM-601 is designed to demonstrate the TPS56121 high-current integrated FET converter in a typical space-limited, 12-V bus to low-voltage point-of-load application. -
Page 5: Electrical Performance Specifications
90.5% η Full-load efficiency VIN = 12 V, IOUT = 15 A 90.4% Operating temperature °C SLVU445C – MARCH 2011 – REVISED AUGUST 2021 TPS56121 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated... -
Page 6: Schematic
Schematic www.ti.com 4 Schematic Figure 4-1. TPS56121EVM-601 Schematic TPS56121 Step-Down Converter Evaluation Module User's Guide SLVU445C – MARCH 2011 – REVISED AUGUST 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated... -
Page 7: Test Setup
2xAWG #14 with the total length of wire less than 2 feet (1 foot input, 1 foot return). SLVU445C – MARCH 2011 – REVISED AUGUST 2021 TPS56121 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated... -
Page 8: Equipment Set Up Procedure
Figure 5-1 and turn it on, ensuring that the air blows directly across the evaluation module. TPS56121 Step-Down Converter Evaluation Module User's Guide SLVU445C – MARCH 2011 – REVISED AUGUST 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated... -
Page 9: Configurations
6.1 Enable Selection (J3) The converter can be enabled and disabled by J3. Shorting J3 discharges the soft-start capacitor and disables the TPS56121 converter. Opening J3 enables the TPS56121 converter. Default setting: short to disable the converter. SLVU445C – MARCH 2011 – REVISED AUGUST 2021... -
Page 10: Test Point Descriptions
7.4 Power Good Monitoring (TP6) TPS56121EVM-601 provides a test points for measuring the Power Good voltage of the TPS56121 converter. 7.5 Loop Response Testing (TP7, TP8, TP9 and TP10) TPS56121EVM-601 provides four test points (two signals and two grounds) for measuring the control loop frequency response. -
Page 11: Test Procedures
Probe Tip Tip and Barrel Vout ripple measurement Figure 8-1. Tip and Barrel Output Voltage Ripple Measurement SLVU445C – MARCH 2011 – REVISED AUGUST 2021 TPS56121 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated... -
Page 12: Control Loop Gain And Phase Measurement Procedure
1. Shut down VIN. 2. Shut down LOAD. 3. Shut down fan. 4. Shut down oscilloscope. TPS56121 Step-Down Converter Evaluation Module User's Guide SLVU445C – MARCH 2011 – REVISED AUGUST 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated... -
Page 13: Performance Data And Typical Characteristic Curves
0.985 VIN = 14 V 0.98 - Load Current - A LOAD Figure 9-2. Load Regulation SLVU445C – MARCH 2011 – REVISED AUGUST 2021 TPS56121 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated... -
Page 14: Line Regulation
Figure 9-3. Line Regulation (VIN = 8 V to 14 V, VOUT = 1.0 V, IOUT = 15 A) 9.4 Output Voltage Ripple Figure 9-4. Output Voltage Ripple (VIN = 12 V, VOUT = 1.0 V, IOUT = 15 A) TPS56121 Step-Down Converter Evaluation Module User's Guide SLVU445C – MARCH 2011 – REVISED AUGUST 2021 Submit Document Feedback... -
Page 15: Switch Node
Figure 9-6. Load Transient (VIN = 12 V, VOUT = 1.0 V, IOUT = 0 A to 15 A) SLVU445C – MARCH 2011 – REVISED AUGUST 2021 TPS56121 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated... -
Page 16: Start Up
Figure 9-7. Start-Up Waveform (VIN = 12 V, VOUT = 1.0 V, IOUT = 15 A) Figure 9-8. Pre-Biased Start-Up Waveform (VIN = 12 V, VOUT = 1.0 V, IOUT = 0 A) TPS56121 Step-Down Converter Evaluation Module User's Guide SLVU445C – MARCH 2011 – REVISED AUGUST 2021 Submit Document Feedback Copyright ©... -
Page 17: Power Off
Figure 9-10. Over-Current Protection Waveform (Ch1: VIN, Ch2: EN/SS, Ch3: VOUT, Ch4: IOUT (10 A/div), VIN = 12 V, VOUT = 1.0 V, IOUT = 23 A) SLVU445C – MARCH 2011 – REVISED AUGUST 2021 TPS56121 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated... -
Page 18: Control Loop Bode Plot
Figure 9-11. Loop Gain (VIN = 12 V, VOUT = 1.0 V, IOUT = 15 A, Bandwidth: 39 kHz, Phase Margin: 46°) 9.11 Thermal Image Figure 9-12. Thermal Image (VIN = 14 V, VOUT = 1.0 V, IOUT = 15 A, without airflow) TPS56121 Step-Down Converter Evaluation Module User's Guide SLVU445C – MARCH 2011 – REVISED AUGUST 2021 Submit Document Feedback... -
Page 19: Evm Assembly Drawings And Pcb Layout
The EVM has been designed using a 4-layer, 2-oz copper-clad circuit board 2.5” x 2.5” with components on both sides of the PCB to allow the user to view, probe and evaluate the TPS56121 high current converter with integrated FETs in a small form factor, high-current application. -
Page 20: Figure 10-3. Tps56121Evm-601 Top Copper (Top View)
EVM Assembly Drawings and PCB Layout www.ti.com Figure 10-3. TPS56121EVM-601 Top Copper (top view) Figure 10-4. TPS56121EVM-601 Internal 1 (top view) TPS56121 Step-Down Converter Evaluation Module User's Guide SLVU445C – MARCH 2011 – REVISED AUGUST 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated... -
Page 21: Figure 10-5. Tps56121Evm-601 Internal
EVM Assembly Drawings and PCB Layout Figure 10-5. TPS56121EVM-601 Internal 2 (top view) Figure 10-6. TPS56121EVM-601 Bottom Copper (top view) SLVU445C – MARCH 2011 – REVISED AUGUST 2021 TPS56121 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated... -
Page 22: List Of Materials
Updated user's guide title........................... • Updated the numbering format for tables, figures, and cross-references throughout the document....3 TPS56121 Step-Down Converter Evaluation Module User's Guide SLVU445C – MARCH 2011 – REVISED AUGUST 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated... - Page 23 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 24 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 25 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 26 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 27 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 28 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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