TPS54429EVM-608

www.ti.com Table of Contents User’s Guide TPS54429 Step-Down Converter Evaluation Module User's Guide ABSTRACT This user's guide contains information for the TPS54429 as well as support documentation for the TPS54429EVM-608 evaluation module. Included are the performance specifications, schematic, and the bill of materials of the TPS54429EVM-608. Table of Contents 1 Introduction.............................................................................................................................................................................3 2 Performance Specification Summary................................................................................................................................... 3 3 Modifications...........................................................................................................................................................................4 3.1 Output Voltage Setpoint..................................................................................................................................................... 4 4 Test Setup and Results.......................................................................................................................................................... 4 4.1 Input/Output Connections.................................................................................................................................................. 5 4.2 Start-Up Procedure............................................................................................................................................................ 5 4.3 Efficiency............................................................................................................................................................................6 4.4 Load Regulation................................................................................................................................................................. 7 4.5 Line Regulation.................................................................................................................................................................. 7 4.6 Load Transient Response.................................................................................................................................................. 8 4.7 Output Voltage Ripple........................................................................................................................................................ 8 4.8 Input Voltage Ripple........................................................................................................................................................... 9 4.9 Start-Up..............................................................................................................................................................................9 5 Board Layout......................................................................................................................................................................... 11 5.1 Layout...............................................................................................................................................................................11 6 Schematic, Bill of Materials, and Reference...................................................................................................................... 15 6.1 Schematic........................................................................................................................................................................ 15 6.2 Bill of Materials.................................................................................................................................................................15 6.3 Reference.........................................................................................................................................................................15 7 Revision History................................................................................................................................................................... 15 List of Figures Figure 4-1. TPS54429EVM-608 Efficiency.................................................................................................................................. 6 Figure 4-2. TPS54429EVM-608 Light Load Efficiency................................................................................................................ 6 Figure 4-3. TPS54429EVM-608 Load Regulation....................................................................................................................... 7 Figure 4-4. TPS54429EVM-608 Line Regulation........................................................................................................................ 7 Figure 4-5. TPS54429EVM-608 Load Transient Response........................................................................................................ 8 Figure 4-6. TPS54429EVM-608 Output Voltage Ripple.............................................................................................................. 8 Figure 4-7. TPS54429EVM-608 Input Voltage Ripple................................................................................................................. 9 Figure 4-8. TPS54429EVM-608 Start-Up Relative to VIN ........................................................................................................... 9 Figure 4-9. TPS54429EVM-608 Start-Up Relative to EN.......................................................................................................... 10 Figure 5-1. Top Assembly.......................................................................................................................................................... 11 Figure 5-2. Top Layer.................................................................................................................................................................12 Figure 5-3. Internal Layer 1....................................................................................................................................................... 12 Figure 5-4. Internal Layer 2....................................................................................................................................................... 13 Figure 5-5. Bottom Layer........................................................................................................................................................... 13 Figure 5-6. Bottom Assembly.................................................................................................................................................... 14 Figure 6-1. TPS54429EVM-608 Schematic Diagram................................................................................................................ 15 SLVU443A – MARCH 2011 – REVISED SEPTEMBER 2021 TPS54429 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 1 Trademarks www.ti.com List of Tables Table 1-1. Input Voltage and Output Current Summary...............................................................................................................3 Table 2-1. TPS54429EVM-608 Performance Specifications Summary.......................................................................................3 Table 3-1. Output Voltages.......................................................................................................................................................... 4 Table 4-1. Connection and Test Points........................................................................................................................................ 5 Table 6-1. Bill of Materials..........................................................................................................................................................15 Trademarks D-CAP2™ are trademarks of Texas Instruments. All trademarks are the property of their respective owners. 2 TPS54429 Step-Down Converter Evaluation Module User's Guide SLVU443A – MARCH 2011 – REVISED SEPTEMBER 2021 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated www.ti.com Introduction 1 Introduction The TPS54429 is a single, adaptive on-time, D-CAP2™-mode, synchronous buck converter that requires a very low external component count. The D-CAP2 control circuit is optimized for low-ESR output capacitors such as POSCAP, SP-CAP, or ceramic types and features fast transient response with no external compensation. The switching frequency is internally set at a nominal 700 kHz. The high-side and low-side switching MOSFETs are incorporated inside the TPS54429 package along with the gate drive circuitry. The low drain-to-source on resistance of the MOSFETs allows the TPS54429 to achieve high efficiencies and helps keep the junction temperature low at high output currents. The TPS54429 dc/dc synchronous converter is designed to provide up to a 4.5-A output from an input voltage source of 7 V to 18 V. The output voltage range is from 0.76 V to 5.5 V. Rated input voltage and output current range for the evaluation module are given in Table 1-1. The TPS54429EVM-608 evaluation module is a single, synchronous buck converter providing 1.05 V at 4.5 A from 7-V to 18-V input. This user’s guide describes the TPS54429EVM-608 performance. Table 1-1. Input Voltage and Output Current Summary EVM INPUT VOLTAGE RANGE OUTPUT CURRENT RANGE TPS54429EVM-608 VIN = 7 V to 18 V 0 A to 4.5 A 2 Performance Specification Summary A summary of the TPS54429EVM-608 performance specifications is provided in Table 2-1. Specifications are given for an input voltage of VIN = 12 V and an output voltage of 1.05 V, unless otherwise noted. The ambient temperature is 25°C for all measurement, unless otherwise noted. Table 2-1. TPS54429EVM-608 Performance Specifications Summary SPECIFICATIONS TEST CONDITIONS Input voltage range (VIN) MIN TYP MAX 7 12 18 Output voltage Operating frequency CH1 VIN = 12 V, IO = 1 A Output current range UNIT V 1.05 V 700 kHz 0 4.5 A Overcurrent limit VIN = 12 V, LO = 1.5 µH 5.9 A Output ripple voltage VIN = 12 V, IO = 4.5 A 10 mVPP SLVU443A – MARCH 2011 – REVISED SEPTEMBER 2021 TPS54429 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 3 Modifications www.ti.com 3 Modifications These evaluation modules are designed to provide access to the features of the TPS54429. Some modifications can be made to this module. 3.1 Output Voltage Setpoint To change the output voltage of the EVMs, it is necessary to change the value of resistor R1. Changing the value of R1 can change the output voltage above 0.765 V. The value of R1 for a specific output voltage can be calculated using Equation 1 and Equation 2. For output voltage from 0.76 V to 2.5 V: æ R1 ö VO = 0.765 ´ ç 1+ ÷ è R2 ø (1) For output voltage over 2.5 V: R1 ö æ VO = (0.763 + 0.0017 ´ VO) ´ ç 1+ ÷ è R2 ø (2) Table 3-1 lists the R1 values for some common output voltages. For higher output voltages of 1.8 V or above, a feedforward capacitor (C2) can be required to improve phase margin. Pads for this component (C2) are provided on the printed-circuit board. Note that the values given in Table 3-1 are standard values and not the exact value calculated using Table 3-1. Table 3-1. Output Voltages OUTPUT VOLTAGE (V) R1 (kΩ) R2 (kΩ) C2 (pF) L1 (µH) 1.0 6.81 22.1 1.5 1.05 8.25 22.1 1.5 1.2 12.7 22.1 1.5 1.5 23.2 22.1 1.5 1.8 30.1 22.1 10 -22 2.2 2.5 49.9 22.1 10 -22 2.2 3.3 73.2 22.1 10 -22 2.2 5.0 121 22.1 10 -22 3.3 4 Test Setup and Results This section describes how to properly connect, set up, and use the TPS54429EVM-608. The section also includes test results typical for the following: • • • • • • • • 4 Evaluation modules and efficiency Output load regulation Output line regulation Load transient response Output voltage ripple Input voltage ripple Start-up Switching frequency TPS54429 Step-Down Converter Evaluation Module User's Guide SLVU443A – MARCH 2011 – REVISED SEPTEMBER 2021 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated www.ti.com Test Setup and Results 4.1 Input/Output Connections The TPS54429EVM-608 is provided with input/output connectors and test points as shown in Table 4-1. A power supply capable of supplying 3 A must be connected to J1 through a pair of 20 AWG wires. The load must be connected to J2 through a pair of 20 AWG wires. The maximum load current capability is 4.5 A. Wire lengths must be minimized to reduce losses in the wires. Test point TP1 provides a place to monitor the VIN input voltages with TP2 providing a convenient ground reference. TP7 is used to monitor the output voltage with TP8 as the ground reference. Table 4-1. Connection and Test Points REFERENCE DESIGNATOR FUNCTION J1 VIN (see Table 1-1 for VIN range) J2 VOUT, 1.05 V at 4.5-A maximum JP1 EN control. Connect EN to OFF to disable, connect EN to ON to enable. TP1 VIN test point at VIN connector TP2 GND test point at VIN TP3 EN test point TP4 Analog ground test point TP5 Switch node test point TP6 Power-good test point TP7 Output voltage test point TP8 Ground test point at output connector 4.2 Start-Up Procedure 1. Ensure that the jumper at JP1 (Enable control) is set from EN to OFF. 2. Apply appropriate VIN voltage to VIN and PGND terminals at J1. 3. Move the jumper at JP1 (Enable control) to cover EN and ON. The EVM enables the output voltage. SLVU443A – MARCH 2011 – REVISED SEPTEMBER 2021 TPS54429 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 5 Test Setup and Results www.ti.com 4.3 Efficiency Figure 4-1 shows the efficiency for the TPS54429EVM-608 at an ambient temperature of 25°C. The input voltage is 12 V. 100 90 80 Efficiecny - % 70 60 50 40 30 20 10 0 0 0.5 1.5 1 2.5 2 3 3.5 4 4.5 Output Current - A Figure 4-1. TPS54429EVM-608 Efficiency Figure 4-2 shows the efficiency at light loads for the TPS54429EVM-608 at an ambient temperature of 25°C. The input voltage is 12 V. 100 90 80 Efficiecny - % 70 60 50 40 30 20 10 0 0.001 0.01 0.1 1 10 Output Current - A Figure 4-2. TPS54429EVM-608 Light Load Efficiency 6 TPS54429 Step-Down Converter Evaluation Module User's Guide SLVU443A – MARCH 2011 – REVISED SEPTEMBER 2021 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated www.ti.com Test Setup and Results 4.4 Load Regulation The load regulation for the TPS54429EVM-608 is shown in Figure 4-3. 1 0.8 Output Voltage Deviation - % 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 0 0.5 1.5 1 2.5 2 Output Current - A 3 3.5 4 4.5 Figure 4-3. TPS54429EVM-608 Load Regulation 4.5 Line Regulation The line regulation for the TPS54429EVM-608 is shown in Figure 4-4. The load current is 2.25 A. 1 0.8 Output Voltage Deviation - % 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 6 9 12 Input Voltage - V 15 18 Figure 4-4. TPS54429EVM-608 Line Regulation SLVU443A – MARCH 2011 – REVISED SEPTEMBER 2021 TPS54429 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 7 Test Setup and Results www.ti.com 4.6 Load Transient Response The TPS54429EVM-608 response to load transient is shown in Figure 4-5. The current step is from 1.25 A to 3.25 A. Total peak-to-peak voltage variation is as shown. VOUT = 20 mV / div (dc coupled, -1.013 V offset) IOUT = 2 A / div Load step = 1.25 A to 3.25 A Slew rate = 100 mA / µsec Time = 100 µsec / div Figure 4-5. TPS54429EVM-608 Load Transient Response 4.7 Output Voltage Ripple The TPS54429EVM-608 output voltage ripple is shown in Figure 4-6. The output current is the rated full load of 4.5 A. VOUT = 20 mV / div (ac coupled) PH = 5 V / div Time = 500 nsec / div Figure 4-6. TPS54429EVM-608 Output Voltage Ripple 8 TPS54429 Step-Down Converter Evaluation Module User's Guide SLVU443A – MARCH 2011 – REVISED SEPTEMBER 2021 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated www.ti.com Test Setup and Results 4.8 Input Voltage Ripple The TPS54429EVM-608 input voltage ripple is shown in Figure 4-7. The output current is the rated full load of 4 A. VIN = 100 mV / div (ac coupled) PH = 5 V / div Time = 500 nsec / div Figure 4-7. TPS54429EVM-608 Input Voltage Ripple 4.9 Start-Up The TPS54429EVM-608 start-up waveform relative to VIN is shown in Figure 4-8. VIN = 5 V / div VOUT = 1 V / div Time = 2 msec / div Figure 4-8. TPS54429EVM-608 Start-Up Relative to VIN The TPS54429EVM-608 start-up waveform relative to enable (EN) is shown in Figure 4-9. SLVU443A – MARCH 2011 – REVISED SEPTEMBER 2021 TPS54429 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 9 Test Setup and Results www.ti.com VIN = 5 V / div EN = 10 V / div VOUT = 1 V / div Time = 2 msec / div Figure 4-9. TPS54429EVM-608 Start-Up Relative to EN 10 TPS54429 Step-Down Converter Evaluation Module User's Guide SLVU443A – MARCH 2011 – REVISED SEPTEMBER 2021 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated www.ti.com Board Layout 5 Board Layout This section provides description of the TPS54429EVM-608, board layout, and layer illustrations. 5.1 Layout The board layout for the TPS54429EVM-608 is shown in Figure 5-1 through Figure 5-6. The top layer contains the main power traces for VIN, VO, and ground. Also on the top layer are connections for the pins of the TPS54429 and a large area filled with ground. Most of the signal traces also are located on the top side. The input decoupling capacitors are located as close to the IC as possible. The input and output connectors, test points, and most of the components are located on the top side. R4, the power-good pullup, is located on the back side. Analog ground and power ground are connected at a single point on the top layer near pin 5 of the TPS54429. The internal layer 1 is a split plane containing analog and power grounds. The internal layer 2 is primarily power ground but also has a fill area of VIN and a trace routing VIN to the enable control jumper JP1. The bottom layer is primarily analog ground but also has traces to connect VIN, traces for the power-good signal, and the feedback trace from VOUT to the voltage setpoint divider network. Figure 5-1. Top Assembly SLVU443A – MARCH 2011 – REVISED SEPTEMBER 2021 TPS54429 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 11 Board Layout www.ti.com Figure 5-2. Top Layer Figure 5-3. Internal Layer 1 12 TPS54429 Step-Down Converter Evaluation Module User's Guide SLVU443A – MARCH 2011 – REVISED SEPTEMBER 2021 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated www.ti.com Board Layout Figure 5-4. Internal Layer 2 Figure 5-5. Bottom Layer SLVU443A – MARCH 2011 – REVISED SEPTEMBER 2021 TPS54429 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 13 Board Layout www.ti.com Figure 5-6. Bottom Assembly 14 TPS54429 Step-Down Converter Evaluation Module User's Guide SLVU443A – MARCH 2011 – REVISED SEPTEMBER 2021 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated www.ti.com Schematic, Bill of Materials, and Reference 6 Schematic, Bill of Materials, and Reference 6.1 Schematic Figure 6-1 is the schematic for the TPS54429EVM-608. Figure 6-1. TPS54429EVM-608 Schematic Diagram 6.2 Bill of Materials Table 6-1. Bill of Materials REFDES QTY VALUE DESCRIPTION C1, C3 2 SIZE PART NUMBER MFR 10 μF Capacitor, Ceramic, 25 V, X5R, 20% 1210 C3225X5R1E106M C11 TDK 0 Open Capacitor, Ceramic 1206 Std Std C2, C8 0 Open Capacitor, Ceramic 0603 Std Std C5 1 3300 pF Capacitor, Ceramic, 25 V, X7R , 10% 0603 Std Std C6 1 1.0 μF Capacitor, Ceramic, 16 V, X7R, 10% 0603 Std Std C4, C7 1 0.1 μF Capacitor, Ceramic, 50 V, X7R, 10% 0603 Std Std C9, C10 2 22 μF Capacitor, Ceramic, 6.3 V, X5R, 20% 1206 C3216X5R0J226M TDK J1, J2 2 ED555/2DS Terminal Block, 2-pin, 6-A, 3.5 mm 0.27 × 0.25 inch ED555/2DS Sullins JP1 1 PEC03SAAN Header, Male 3-pin, 100-mil spacing 0.100 inch × 3 PEC03SAAN Sullins L1 1 1.5 μH Inductor, SMT, 11 A, 9.7 mΩ 0.256 × 0.280 inch SPM6530T-1R5M100 TDK R1 1 8.25 k Resistor, Chip, 1/16W, 1% 0603 Std Std R2 1 22.1 k Resistor, Chip, 1/16W, 1% 0603 Std Std R3 1 0 Resistor, Chip, 1/16W, 1% 0603 Std Std R4 1 100 k Resistor, Chip, 1/16W, 1% 0603 Std Std R5 0 Open Resistor, Chip, 1/16W, 1% 0603 Std Std TP1, TP3, TP4, TP6, TP7, TP8, TP9 3 5000 Test Point, Red, Thru Hole Color Keyed 0.100 × 0.100 inch 5000 Keystone TP2, TP5, TP9 3 5001 Test Point, Black, Thru Hole Color Keyed 0.100 × 0.100 inch 5001 Keystone U1 1 TPS54429PWP IC, 4.5-A Output Single Sync. Step-Down TPS54429PWP TI 929950-00 3M HPA608 Any – 1 Shunt, 100-mil, Black – 1 PCB, 2.76 In x 1.97 In × 0.062 In 0.100 6.3 Reference Texas Instruments, TPS54429, 7V to 18V Input, 4.5-A Synchronous Step-Down SWIFT™ Converter Data Sheet 7 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision * (March 2011) to Revision A (September 2011) Page • Updated the numbering format for tables, figures, and cross-references throughout the document. ................3 SLVU443A – MARCH 2011 – REVISED SEPTEMBER 2021 TPS54429 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 15 Revision History • 16 www.ti.com Updated the user's guide title ............................................................................................................................ 3 TPS54429 Step-Down Converter Evaluation Module User's Guide SLVU443A – MARCH 2011 – REVISED SEPTEMBER 2021 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 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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