TPS62120EVM-640

www.ti.com Table of Contents User’s Guide TPS62120 Buck Converter Evaluation Module User's Guide ABSTRACT This user’s guide describes the characteristics, operation, and use of the TPS62120 evaluation module (EVM). The TPS62120EVM-640 is a fully assembled and tested circuit for evaluating the performance of the TPS62120 high-input voltage step-down converter. This document includes schematic diagrams, a printed circuit board (PCB) layout, bill of materials, and test data. Throughout this document, the abbreviation EVM and the term evaluation module are synonymous with the TPS62120EVM-640 unless otherwise noted. Table of Contents 1 Introduction.............................................................................................................................................................................2 1.1 Features............................................................................................................................................................................. 2 1.2 Applications........................................................................................................................................................................2 2 TPS62120EVM Schematic...................................................................................................................................................... 3 3 Connector and Test Point Descriptions................................................................................................................................4 3.1 Enable Jumpers/Switches (RefDes) TPS62120................................................................................................................ 4 4 Test Configuration.................................................................................................................................................................. 5 4.1 Hardware Setup................................................................................................................................................................. 5 4.2 Procedure...........................................................................................................................................................................6 5 TPS62120EVM Test Data........................................................................................................................................................ 7 5.1 Efficiency............................................................................................................................................................................7 5.2 Start-Up..............................................................................................................................................................................8 5.3 Load Transient Response.................................................................................................................................................. 9 5.4 Typical Operation, 60 mA...................................................................................................................................................9 5.5 Typical Operation, 10 mA...................................................................................................................................................9 5.6 Current Limit Operation....................................................................................................................................................10 6 TPS62120EVM Assembly Drawings and Layout................................................................................................................12 7 Bill of Materials..................................................................................................................................................................... 15 8 Revision History................................................................................................................................................................... 15 List of Figures Figure 4-1. Hardware Board Connection..................................................................................................................................... 5 Figure 5-1. TPS62120EVM Efficiency versus Load Current........................................................................................................7 Figure 5-2. TPS62120EVM Startup into 300-Ω Load(VIN = 8.0 V, VOUT = 3.0 V)........................................................................ 8 Figure 5-3. TPS62120EVM Start-Up from a High-Impedance Source(VIN = 12.0 V, VOUT = 3.0 V)............................................ 8 Figure 5-4. Power Good Output During Start-Up.........................................................................................................................8 Figure 5-5. Output Discharge with SGND Pin Connected to VOUT............................................................................................ 8 Figure 5-6. TPS62120 Load Transient Response(VIN = 8.0 V, VOUT = 1.8 V)............................................................................. 9 Figure 5-7. TPS62120EVM Output Ripple, 60-mA Load(VIN = 8.0 V, VOUT = 3.0 V)...................................................................9 Figure 5-8. TPS62120EVM Output Ripple, 10-mA Load(VIN = 8.0 V, VOUT = 3.0 V).................................................................10 Figure 5-9. Current Limit Operation........................................................................................................................................... 11 Figure 6-1. TPS62120EVM Component Placement (Top View)................................................................................................ 12 Figure 6-2. TPS62120EVM Top-Side Copper (Top View)..........................................................................................................13 Figure 6-3. TPS62120EVM Bottom-Side Copper (Bottom View)...............................................................................................14 Trademarks All trademarks are the property of their respective owners. SLVU411A – SEPTEMBER 2010 – REVISED JUNE 2021 TPS62120 Buck Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 1 Introduction www.ti.com 1 Introduction The TPS62120 is a high-efficiency, synchronous step-down, dc-dc converter optimized for low-power applications. The wide operating input voltage range of 2 V to 15 V supports energy harvesting and batterypowered as well 9-V or 12-V line-powered applications. The TPS62120EVM-640 is a fully assembled and tested platform for evaluating the operation and performance of the TPS62120 converter. The TPS62120EVM-640 has an input voltage range from 2.0 V up to 15 V, and the output voltage is adjustable with an external feedback divider network in the range of 1.2 V to 5.5 V. The maximum output current of the EVM circuit is 75 mA. 1.1 Features • • • • High input voltage range: 2.0 V up to 15 V Adjustable output voltage: 1.2 V up to 5.5 V Up to 75-mA output current Up to 800-kHz switching frequency 1.2 Applications • • • 2 Ultralow-power microcontroller supply Energy harvesting Industrial measurement TPS62120 Buck Converter Evaluation Module User's Guide SLVU411A – SEPTEMBER 2010 – REVISED JUNE 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com TPS62120EVM Schematic 2 TPS62120EVM Schematic TPS62120EVM Schematic illustrates the TPS62120EVM-640 schematic. + For reference only; see Table 7-1 for specific values. Figure 2-1. TPS62120EVM Schematic SLVU411A – SEPTEMBER 2010 – REVISED JUNE 2021 TPS62120 Buck Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 3 Connector and Test Point Descriptions www.ti.com 3 Connector and Test Point Descriptions 3.1 Enable Jumpers/Switches (RefDes) TPS62120 3.1.1 J1 VIN This header is the positive connection to the input power supply. The power supply must be connected between J1 and J3 (GND). The leads to the input supply should be twisted and kept as short as possible. The input voltage must be between 2.0 V and 15.0 V. 3.1.2 J2 S+/S– J2 S+/S– are the sense connection for the input of the converter. Connect a voltmeter, sense connection of a power supply, or oscilloscope to this header. 3.1.3 J3 GND This header is the return connection to the input power supply. Connect the power supply between J3 and J11 (VIN). The leads to the input supply should be twisted and kept as short as possible. The input voltage must be between 2.0 V and 15.0 V. 3.1.4 J4 VOUT This header is the positive output of the step-down converter. The output voltage of the TPS62120 is adjustable, with the feedback resistors R1 and R2. On the EVM, the output voltage can be adjusted in the range of 1.2 V to 5.5 V. Note: A feed-forward capacitor is required. Refer to the TPS62120 data sheet (SLVSAD5) for detailed information. 3.1.5 J5 S+/S– J5 S+/S– are the sense connection for the output of the converter. Connect a voltmeter, sense connection of an electronic load, or oscilloscope to this header. 3.1.6 J6 GND J6 is the return connection of the converter. A load can be connected between J4and J6 (VOUT). The converter is able to support a load current of up to 75 mA. 3.1.7 JP1 EN This jumper enables/disables the TPS62120 on the EVM. The shorting jumper JP1 between the center pin and ON turns on the unit. Shorting the jumper between the center pin and OFF turns the unit off. 3.1.8 JP2 SGND JP2 connects the output capacitor of the TPS62120 to the open drain output SGND. SGND is low when the TPS62120 is in shutdown mode, thus discharging the output capacitor. If the TPS62120 is enabled, the open drain output SGND is high impedance. 3.1.9 J7 VOUT (SMA) The J7 SMA connector is connected to the output voltage of the TPS62120. The noise spectrum of the output voltage can be easily analyzed with a spectrum analyzer. By default, J7 is not assembled on the EVM. 3.1.10 J8 PG/GND J8 pin 1 is connected to the Power Good (PG) output of the TPS62120. This open drain output is pulled up to VOUT with R3. PG output goes high when the FB voltage rises above 95% (typ) of its nominal value. PG goes low when the FB voltage drops below 90% (typ) of its nominal value. 4 TPS62120 Buck Converter Evaluation Module User's Guide SLVU411A – SEPTEMBER 2010 – REVISED JUNE 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Test Configuration 4 Test Configuration 4.1 Hardware Setup Figure 4-1 illustrates a typical hardware test configuration. Load Oscilloscope J4 J1 J2 S+ S- J3 GND J6 VOUT S+ S- GND J7 VIN J5 + DC Power Supply - TPS62120EVM-640 JP2 EN ON OFF PG JP1 GND J8 Figure 4-1. Hardware Board Connection SLVU411A – SEPTEMBER 2010 – REVISED JUNE 2021 TPS62120 Buck Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 5 Test Configuration www.ti.com 4.2 Procedure Follow these procedures when configuring the EVM for testing. CAUTION Many of the components on the TPS62120EVM-640 are susceptible to damage by electrostatic discharge (ESD). Customers are advised to observe proper ESD handling precautions when unpacking and handling the EVM, including the use of a grounded wrist strap, bootstraps, or mats at an approved ESD workstation. An electrostatic smock and safety glasses should also be worn. 1. Work at an ESD workstation. Make sure that any wrist straps, bootstraps, or mats are connected and reference the user to earth ground before power is applied to the EVM. Electrostatic smock and safety glasses should also be worn. 2. Connect a dc power supply between J1 and J3 on the TPS62120EVM. Note that the input voltage should range from 2.0 V to 15 V. Keep the wires from the input power supply to EVM as short as possible and twisted. 3. Connect a dc voltmeter or oscilloscope to the output sense connection (J5) of the EVM. 4. A load of up to 75 mA can be connected between J4 and J6 on the TPS62120EVM. 5. To enable the converter, connect the shorting bar on JP1 between EN and ON on the TPS62120EVM. 6 TPS62120 Buck Converter Evaluation Module User's Guide SLVU411A – SEPTEMBER 2010 – REVISED JUNE 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com TPS62120EVM Test Data 5 TPS62120EVM Test Data Figure 5-1 through Figure 5-9 present typical performance graphs for the TPS62120EVM. Actual performance data can be affected by measurement techniques and environmental variables; therefore, these curves are presented for reference and may differ from actual results obtained by some users. 5.1 Efficiency Figure 5-1 shows the typical efficiency performance for the TPS62120EVM. 100 90 VIN = 5 V VIN = 3.5 V Efficiency - % 80 70 VIN = 9 V VIN = 12 V VIN = 7 V VIN = 15 V 60 50 VO = 3.3 V, L = 18 mH, LPS3015, CO = 4.7 mF 40 30 0.1 1 10 IO - Output Current - mA 100 Figure 5-1. TPS62120EVM Efficiency versus Load Current SLVU411A – SEPTEMBER 2010 – REVISED JUNE 2021 TPS62120 Buck Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 7 TPS62120EVM Test Data www.ti.com 5.2 Start-Up Figure 5-2 through Figure 5-5 show the typical start-up performance for different TPS62120EVM boards. 8 Figure 5-2. TPS62120EVM Startup into 300-Ω Load(VIN = 8.0 V, VOUT = 3.0 V) Figure 5-3. TPS62120EVM Start-Up from a HighImpedance Source(VIN = 12.0 V, VOUT = 3.0 V) Figure 5-4. Power Good Output During Start-Up Figure 5-5. Output Discharge with SGND Pin Connected to VOUT TPS62120 Buck Converter Evaluation Module User's Guide SLVU411A – SEPTEMBER 2010 – REVISED JUNE 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com TPS62120EVM Test Data 5.3 Load Transient Response Figure 5-6 illustrates the load transient response for the TPS62120. Figure 5-6. TPS62120 Load Transient Response(VIN = 8.0 V, VOUT = 1.8 V) 5.4 Typical Operation, 60 mA Figure 5-7 illustrates the typical output voltage ripple for the TPS62120 with a 60-mA load. Figure 5-7. TPS62120EVM Output Ripple, 60-mA Load(VIN = 8.0 V, VOUT = 3.0 V) 5.5 Typical Operation, 10 mA Figure 5-8 illustrates the typical output voltage ripple for the TPS62120 with a 10-mA load. SLVU411A – SEPTEMBER 2010 – REVISED JUNE 2021 TPS62120 Buck Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 9 TPS62120EVM Test Data www.ti.com Figure 5-8. TPS62120EVM Output Ripple, 10-mA Load(VIN = 8.0 V, VOUT = 3.0 V) 5.6 Current Limit Operation Figure 5-9 shows the current limit operation of the TPS62120. 10 TPS62120 Buck Converter Evaluation Module User's Guide SLVU411A – SEPTEMBER 2010 – REVISED JUNE 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com TPS62120EVM Test Data Figure 5-9. Current Limit Operation SLVU411A – SEPTEMBER 2010 – REVISED JUNE 2021 TPS62120 Buck Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 11 TPS62120EVM Assembly Drawings and Layout www.ti.com 6 TPS62120EVM Assembly Drawings and Layout Figure 6-1 through Figure 6-3 show the design of the show the design of the TPS62120EVM-640 printed circuit board. The EVM has been designed using a four-layer, 1-ounce copper-clad PCB. Note Board layouts are not to scale. These figures are intended to show how the board is laid out; they are not intended to be used for manufacturing TPS62120EVM-640 PCBs. TEXAS INSTRUMENTS Figure 6-1. TPS62120EVM Component Placement (Top View) 12 TPS62120 Buck Converter Evaluation Module User's Guide SLVU411A – SEPTEMBER 2010 – REVISED JUNE 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com TPS62120EVM Assembly Drawings and Layout Figure 6-2. TPS62120EVM Top-Side Copper (Top View) SLVU411A – SEPTEMBER 2010 – REVISED JUNE 2021 TPS62120 Buck Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 13 TPS62120EVM Assembly Drawings and Layout www.ti.com Figure 6-3. TPS62120EVM Bottom-Side Copper (Bottom View) 14 TPS62120 Buck Converter Evaluation Module User's Guide SLVU411A – SEPTEMBER 2010 – REVISED JUNE 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Bill of Materials 7 Bill of Materials Table 7-1 lists the bill of materials for the TPS62120EVM. Table 7-1. TPS62120EVM-640 Bill of Materials Count RefDes Value Description Size Part Number MFR 0805 GRM21BR61E475MA12L muRata 1 C1 4.7 µF Capacitor, Ceramic, 25 V, X5R, 20% 1 C3 4.7 µF Capacitor, Ceramic, Low Inductance, 6.3 V, X5R, 20% 0603 GRM188R60J475ME19D muRata 1 C5 15 pF Capacitor, Ceramic, 50 V, C0GNP0, 5% 0603 Std Std 1 L1 18 µH Inductor, SMT, 0.56 A, 750 mΩ 0.118 x 0.118 inch LPS3015-183ML Coilcraft 1 R1 301k Resistor, Chip, 1/16W, 1% 0603 Std Std 1 R2 243k Resistor, Chip, 1/16W, 1% 0603 Std Std 1 R3 10.0 kΩ Resistor, Chip, 1/16W, 1% 0603 Std Std TPS62120DRV IC, 15-V, 75-mA High-Efficiency Buck Converter with Snooze Mode SSOP TPS62120DCN TI 1 U1 8 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision * (September 2010) to Revision A (June 2021) Page • Updated the numbering format for tables, figures, and cross-references throughout the document. ................2 • Updated user's guide title................................................................................................................................... 2 SLVU411A – SEPTEMBER 2010 – REVISED JUNE 2021 TPS62120 Buck Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 15 IMPORTANT NOTICE AND DISCLAIMER TI PROVIDES TECHNICAL AND RELIABILITY DATA (INCLUDING DATA SHEETS), DESIGN RESOURCES (INCLUDING REFERENCE DESIGNS), APPLICATION OR OTHER DESIGN ADVICE, WEB TOOLS, SAFETY INFORMATION, AND OTHER RESOURCES “AS IS” AND WITH ALL FAULTS, AND DISCLAIMS ALL WARRANTIES, EXPRESS AND IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY RIGHTS. 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