TPS54428EVM-052

www.ti.com Table of Contents User’s Guide TPS54428 Step-Down Converter Evaluation Module User's Guide ABSTRACT This user's guide contains information for the TPS54428 as well as support documentation for the TPS54428EVM-052 evaluation module. Included are the performance specifications, schematic, and the bill of materials of the TPS54428EVM-052 evaluation module. Table of Contents 1 Introduction.............................................................................................................................................................................3 2 Performance Specification Summary................................................................................................................................... 4 3 Modifications...........................................................................................................................................................................5 3.1 Output Voltage Setpoint..................................................................................................................................................... 5 3.2 Output Filter and Closed-Loop Response..........................................................................................................................5 4 Test Setup and Results.......................................................................................................................................................... 6 4.1 Input/Output Connections.................................................................................................................................................. 6 4.2 Start-Up Procedure............................................................................................................................................................ 6 4.3 Efficiency............................................................................................................................................................................7 4.4 Load Regulation................................................................................................................................................................. 8 4.5 Line Regulation.................................................................................................................................................................. 8 4.6 Frequency.......................................................................................................................................................................... 9 4.7 Load Transient Response.................................................................................................................................................. 9 4.8 Output Voltage Ripple...................................................................................................................................................... 10 4.9 Input Voltage Ripple......................................................................................................................................................... 11 4.10 Start-Up and Shut-Down................................................................................................................................................ 12 5 Board Layout.........................................................................................................................................................................13 5.1 Layout.............................................................................................................................................................................. 13 6 Schematic, Bill of Materials, and Reference...................................................................................................................... 16 6.1 Schematic........................................................................................................................................................................ 16 6.2 Bill of Materials.................................................................................................................................................................16 6.3 Reference.........................................................................................................................................................................16 7 Revision History................................................................................................................................................................... 16 List of Figures Figure 4-1. TPS54428EVM-052 Efficiency.................................................................................................................................. 7 Figure 4-2. TPS54428EVM-052 Light-Load Efficiency................................................................................................................ 7 Figure 4-3. TPS54428EVM-052 Load Regulation, VIN = 5 V and VIN = 12 V.............................................................................. 8 Figure 4-4. TPS54428EVM-052 Line Regulation........................................................................................................................ 8 Figure 4-5. TPS54428EVM-52 Frequency.................................................................................................................................. 9 Figure 4-6. TPS54428EVM-052 Load Transient Response, 1 A to 3 A.......................................................................................9 Figure 4-7. TPS54428EVM-052 Load Transient Response, 0.01 A to 2 A..................................................................................9 Figure 4-8. TPS54428EVM-052 Output Voltage Ripple............................................................................................................ 10 Figure 4-9. TPS54428EVM-052 Eco-mode™ Output Voltage Ripple........................................................................................ 10 Figure 4-10. TPS54428EVM-052 Eco-mode™ Output Voltage Ripple at No Load.................................................................... 11 Figure 4-11. TPS54428EVM-052 Input Voltage Ripple..............................................................................................................11 Figure 4-12. TPS54428EVM-052 Start-Up Relative to VIN ....................................................................................................... 12 Figure 4-13. TPS54428EVM-052 Shut-down Relative to VIN ................................................................................................... 12 Figure 4-14. TPS54428EVM-052 Start-Up Relative to EN........................................................................................................ 12 Figure 4-15. TPS54428EVM-052 Shut-down Relative to EN.................................................................................................... 12 Figure 5-1. Top Assembly.......................................................................................................................................................... 13 Figure 5-2. Top Layer.................................................................................................................................................................13 SLVU578A – DECEMBER 2011 – REVISED SEPTEMBER 2021 TPS54428 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 1 Trademarks www.ti.com Figure 5-3. Internal Layer 1....................................................................................................................................................... 14 Figure 5-4. Internal Layer 2....................................................................................................................................................... 14 Figure 5-5. Bottom Layer........................................................................................................................................................... 15 Figure 6-1. TPS54428EVM-052 Schematic Diagram................................................................................................................ 16 List of Tables Table 1-1. Input Voltage and Output Current Summary...............................................................................................................3 Table 2-1. TPS54428EVM-052 Performance Specifications Summary.......................................................................................4 Table 3-1. Output Voltages.......................................................................................................................................................... 5 Table 4-1. Connection and Test Points........................................................................................................................................ 6 Table 6-1. Bill of Materials..........................................................................................................................................................16 Trademarks D-CAP2™ are trademarks of Texas Instruments. Eco-mode™ is a trademark of TI. All trademarks are the property of their respective owners. 2 TPS54428 Step-Down Converter Evaluation Module User's Guide SLVU578A – DECEMBER 2011 – REVISED SEPTEMBER 2021 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated www.ti.com Introduction 1 Introduction The TPS54428 is a single, adaptive on-time, D-CAP2™-mode, synchronous buck converter requiring a 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 650 kHz. The high-side and low-side switching MOSFETs are incorporated inside the TPS54428 package along with the gate drive circuitry. The low drain-to-source on resistance of the MOSFETs allows the TPS54428 to achieve high efficiencies and helps keep the junction temperature low at high-output currents. The TPS54428 also features auto-skip Eco-mode operation for improved light-load efficiency. The TPS54428 dc/dc synchronous converter is designed to provide up to a 4 A output from an input voltage source of 4.5 V to 18 V. The output voltage range is from 0.76 V to 6 V. Rated input voltage and output current range for the evaluation module are given in Table 1-1. The TPS54428EVM-052 evaluation module is a single, synchronous buck converter providing 1.05 V at 4 A from 4.5-V to 18-V input. This user’s guide describes the TPS54428EVM-052 performance. Table 1-1. Input Voltage and Output Current Summary EVM Input Voltage Range Output Current Range TPS54428EVM-052 VIN = 4.5 V to 18 V 0 A to 4 A SLVU578A – DECEMBER 2011 – REVISED SEPTEMBER 2021 TPS54428 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 3 Performance Specification Summary www.ti.com 2 Performance Specification Summary A summary of the TPS54428 evaluation module 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. TPS54428EVM-052 Performance Specifications Summary SPECIFICATIONS TEST CONDITIONS Input voltage range (VIN) MIN TYP MAX 4.5 12 18 Output voltage (VOUT) Operating frequency VIN = 12 V, IOUT = 2 A Output current range 4 UNIT V 1.05 V 650 kHz 0 4 IO = 2.5 A Load regulation VIN = 12 V Overcurrent limit VIN = 12 V, L = 1.5 µH Output ripple voltage VIN = 12 V, IOUT = 4A 15 mVPP Maximum efficiency VIN = 5 V, IOUT= 0.7 A 88 % TPS54428 Step-Down Converter Evaluation Module User's Guide +/- 0.33 A Line regulation % +0.9/- 0.1 4.6 5.3 % 6.8 A SLVU578A – DECEMBER 2011 – REVISED SEPTEMBER 2021 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated www.ti.com Modifications 3 Modifications This evaluation module is designed to provide access to the features of the TPS54428. Some modifications can be made to this module. 3.1 Output Voltage Setpoint To change the output voltage of the EVM, 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. For output voltages from 0.76 V to 7 V: R1 ö æ VOUT = 0.765V × ç 1 + R 2 ÷ø è (1) 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 (C4) may be required to improve phase margin. Pads for this component (C4) are provided on the printed-circuit board. Note that the resistor values given in Table 3-1 are standard values and not the exact value calculated using Equation 1. Table 3-1. Output Voltages OUTPUT VOLTAGE (V) R1 (kΩ) R2 (kΩ) C4 (pF) L1 (µH) C9. C10, C11 TOTAL CAPACITANCE (µF) 1 6.81 22.1 1.5 22 - 68 1.05 8.25 22.1 1.5 22 - 68 1.2 12.7 22.1 1.5 22 - 68 1.5 21.5 22.1 1.5 22 - 68 1.8 30.1 22.1 5 - 22 2.2 22 - 68 2.5 49.9 22.1 5 - 22 2.2 22 - 68 3.3 73.2 22.1 5 - 22 2.2 22 - 68 5 124 22.1 5 - 22 3.3 22 - 68 6.5 165 22.1 5 - 22 3.3 22 - 68 3.2 Output Filter and Closed-Loop Response The TPS54428 relies on the output filter characteristics to ensure stability of the control loop. The recommended output filter components for common output voltages are given in Table 3-1. It may be possible for other output filter component values to provide acceptable closed-loop characteristics. R3 and TP4 are provided for convenience in breaking the control loop and measuring the closed-loop response. SLVU578A – DECEMBER 2011 – REVISED SEPTEMBER 2021 TPS54428 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 Test Setup and Results This section describes how to properly connect, set up, and use the TPS54428EVM-052. It also includes test results typical for the evaluation module like efficiency, output load regulation, output line regulation, load transient response, output voltage ripple, input voltage ripple, start-up, shut-down, and switching frequency. 4.1 Input/Output Connections Table 4-1 shows the input/output connectors and test points of TPS54428EVM-052. Connect a power supply capable of supplying 2 A to J1 through a pair of 20 AWG wires. Connect the load to J2 through a pair of 20 AWG wires. The maximum load current capability is 4 A. Minimize wire lengths to reduce losses in the wires. Test point TP1 provides a place to monitor the input voltages (VIN) with TP2 providing a convenient ground reference. Use TP8 to monitor the output voltage with TP9 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 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 Loop response measurement test point TP5 VREG5 test point TP6 Switch node test point TP7 Analog ground test point TP8 Output voltage test point TP9 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. 6 TPS54428 Step-Down Converter Evaluation Module User's Guide SLVU578A – DECEMBER 2011 – REVISED SEPTEMBER 2021 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated www.ti.com Test Setup and Results 4.3 Efficiency Figure 4-1 shows the efficiency for the TPS54428EVM-052 at an ambient temperature of 25°C. 100 90 80 Efficiency (%) 70 60 50 40 30 20 VIN = 12 V VIN = 5.0 V 10 0 0 500 1000 1500 2000 2500 Output Current (mA) 3000 3500 4000 G000 Figure 4-1. TPS54428EVM-052 Efficiency Figure 4-2 shows the efficiency at light loads for the TPS54428EVM-052 at an ambient temperature of 25°C. 100 90 80 Efficiency (%) 70 60 50 40 30 20 VIN = 12 V VIN = 5.0 V 10 0 1 10 100 1000 Output Current (mA) G000 Figure 4-2. TPS54428EVM-052 Light-Load Efficiency SLVU578A – DECEMBER 2011 – REVISED SEPTEMBER 2021 TPS54428 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 7 Test Setup and Results www.ti.com 4.4 Load Regulation The load regulation for the TPS54428EVM-052 is shown in Figure 4-3. The output voltage at 2 A load was used as reference value. 1 0.8 Output Voltage, OUTP (%) 0.6 0.4 0.2 0 −0.2 −0.4 −0.6 VIN = 12 V VIN = 5.0 V −0.8 −1 0 500 1000 1500 2000 2500 Output Current (mA) 3000 3500 4000 G000 Figure 4-3. TPS54428EVM-052 Load Regulation, VIN = 5 V and VIN = 12 V 4.5 Line Regulation The line regulation for the TPS54428EVM-052 is shown in Figure 4-4. The output voltage at 12V input voltage was used as reference value. 0.5 0.4 Output Voltage, OUTP (%) 0.3 0.2 0.1 0 −0.1 −0.2 IOUT = 0 A IOUT = 1 A IOUT = 2 A IOUT = 4 A −0.3 −0.4 −0.5 4.5 6 7.5 9 10.5 12 Input Voltage (V) 13.5 15 16.5 18 G000 Figure 4-4. TPS54428EVM-052 Line Regulation 8 TPS54428 Step-Down Converter Evaluation Module User's Guide SLVU578A – DECEMBER 2011 – REVISED SEPTEMBER 2021 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated www.ti.com Test Setup and Results 4.6 Frequency The TPS54428 uses Eco-mode™ to increase the efficiency at light load. This means that the frequency is getting lower for lower load conditions. Figure 4-5 shows the switching frequency of the part across the load range. 700 600 Frequency (kHz) 500 400 300 200 100 0 VIN = 12 V VIN = 5.0 V 0 500 1000 1500 2000 2500 Output Current (mA) 3000 3500 4000 G000 Figure 4-5. TPS54428EVM-52 Frequency 4.7 Load Transient Response The TPS54428EVM-052 response to load transient steps are shown in Figure 4-6 and Figure 4-7. Total peak-topeak voltage variation is as shown. VOUT 100 mV/div (-0.85 V offset) VOUT 100 mV/div (-0.85 V offset) IOUT 1 A/div Load Step: 1 A to 3 A Slew Rate: 1 A/µs VIN = 12 V IOUT 1 A/div Load Step: 0.01 A to 2 A Slew Rate: 1 A/µs Time 100 µs/div Figure 4-6. TPS54428EVM-052 Load Transient Response, 1 A to 3 A VIN = 12 V Time 100 µs/div Figure 4-7. TPS54428EVM-052 Load Transient Response, 0.01 A to 2 A SLVU578A – DECEMBER 2011 – REVISED SEPTEMBER 2021 TPS54428 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 9 Test Setup and Results www.ti.com 4.8 Output Voltage Ripple The TPS54428EVM-052 output voltage ripple is shown in Figure 4-8. The output current is the rated full load of 4 A. VSW 5 V/div VOUT 20 mV/div (-1.09 V offset) VIN = 12 V Time 1 µs/div Figure 4-8. TPS54428EVM-052 Output Voltage Ripple The TPS54428EVM-052 output voltage ripple during the start of Eco-mode™ operation is shown in Figure 4-9 . The output current is 30 mA. VSW 5 V/div VOUT 20 mV/div (-1.09 V offset) VIN = 12 V Time 1 µs/div Figure 4-9. TPS54428EVM-052 Eco-mode™ Output Voltage Ripple 10 TPS54428 Step-Down Converter Evaluation Module User's Guide SLVU578A – DECEMBER 2011 – REVISED SEPTEMBER 2021 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated www.ti.com Test Setup and Results The TPS54428EVM-052 output voltage ripple during Eco-mode™ operation is shown in Figure 4-10. The output current is 0 mA. VSW 5 V/div VOUT 20 mV/div (-1.09 V offset) VIN = 12 V Time 500 µs/div Figure 4-10. TPS54428EVM-052 Eco-mode™ Output Voltage Ripple at No Load 4.9 Input Voltage Ripple The TPS54428EVM-052 input voltage ripple is shown in Figure 4-11. The output current is the rated full load of 4 A and the input voltage is set to 5 V. VIN 50 mV/div (AC coupled) VOUT 50 mV/div (-1.05V offset) VSW 5 V/div Time 1 µs/div Figure 4-11. TPS54428EVM-052 Input Voltage Ripple SLVU578A – DECEMBER 2011 – REVISED SEPTEMBER 2021 TPS54428 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 11 Test Setup and Results www.ti.com 4.10 Start-Up and Shut-Down The TPS54428EVM-052 start-up and shut-down waveforms relative to VIN with no load are shown in Figure 4-12 and Figure 4-13. VIN 2 V/div VIN 2 V/div VOUT 500 mV/div VOUT 500 mV/div VREG5 2 V/div VREG5 2 V/div IIN 50 mA/div IIN 50 mA/div Time 2 ms/div Time 2 ms/div Figure 4-12. TPS54428EVM-052 Start-Up Relative to VIN Figure 4-13. TPS54428EVM-052 Shut-down Relative to VIN The TPS54428EVM-052 start-up and shut-down waveforms relative to enable (EN) with no load are shown in Figure 4-14 and Figure 4-15. EN 2 V/div EN 2 V/div VOUT 500 mV/div VOUT 500 mV/div VREG5 2 V/div VREG5 2 V/div IIN 1 A/div IIN 1 A/div Time 2 ms/div Time 50 µs/div Figure 4-14. TPS54428EVM-052 Start-Up Relative to EN 12 TPS54428 Step-Down Converter Evaluation Module User's Guide Figure 4-15. TPS54428EVM-052 Shut-down Relative to EN SLVU578A – DECEMBER 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 TPS54428EVM-052, board layout, and layer illustrations. 5.1 Layout The board layout for the TPS54428EVM-052 is shown in Figure 5-1 through Figure 5-5. 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 TPS54428 and a large area filled with ground. Many 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 all of the components are located on the top side. An analog ground (GND) area is provided on the top side. Analog ground (GND) and power ground (PGND) are connected at a single point on the top layer near C6. The bottom layer is primarily power ground but also has a trace to connect VIN to the enable jumper, a trace to connect VREG5 to TP5, and the feedback trace from VOUT to the voltage setpoint divider network. Figure 5-1. Top Assembly Figure 5-2. Top Layer SLVU578A – DECEMBER 2011 – REVISED SEPTEMBER 2021 TPS54428 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 13 Board Layout www.ti.com Figure 5-3. Internal Layer 1 Figure 5-4. Internal Layer 2 14 TPS54428 Step-Down Converter Evaluation Module User's Guide SLVU578A – DECEMBER 2011 – REVISED SEPTEMBER 2021 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated www.ti.com Board Layout Figure 5-5. Bottom Layer SLVU578A – DECEMBER 2011 – REVISED SEPTEMBER 2021 TPS54428 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 15 Schematic, Bill of Materials, and Reference www.ti.com 6 Schematic, Bill of Materials, and Reference 6.1 Schematic Figure 6-1 is the schematic for the TPS54428EVM-052. TP1 J1 VIN = 4.5 V - 18 V VIN 1 GND 2 TP2 C1 C2 C3 10uF 10uF 0.1uF 3 JP1 TP4 R3 0 R1 ON 1 EN 2 OFF 3 TP3 R4 10.0k 2 U1 TPS54x2xDDA 1 EN 8.25k VIN 8 2 VFB 1 C4 3 VREG5 TP5 4 SS C7 0.1uF VBST 7 PWPD VOUT TP6 C5 C6 22.1k 1uF 8200pF TP7 TP8 VOUT = 1.05 V VOUT J2 GND 5 C8 9 R2 L1 1.5uH SW 6 D1 1 C9 C10 22uF 22uF C11 TP9 1 2 VOUT 1 GND R5 1 1 1 Not Installed 2 See BOM for IC usage 3 Optional Auto-ECO IC Usage Input Voltage Range Iout Max TPS54527 4.5 V to 18 V 5A No TPS54528 4.5 V to 18 V 5A Yes TPS54427 4.5 V to 18 V 4A No TPS54428 4.5 V to 18 V 4A Yes Figure 6-1. TPS54428EVM-052 Schematic Diagram 6.2 Bill of Materials Table 6-1. Bill of Materials REFDES QTY VALUE DESCRIPTION C1, C2 2 SIZE PART NUMBER MFR 10 μF Capacitor, Ceramic, 25 V, X5R, 20% 1210 Std C11 Std 0 Open Capacitor, Ceramic 1206 Std Std C3, C7 2 0.1 μF Capacitor, Ceramic, 50 V, X7R, 10% 0603 Std Std C4, C8 1 Open Capacitor, Ceramic 0603 Std Std C5 1 1.0 μF Capacitor, Ceramic, 16 V, X7R, 10% 0603 Std Std C6 1 8200 pF Capacitor, Ceramic, 25 V, X7R , 10% 0603 Std Std C9, C10 2 22 μF Capacitor, Ceramic, 6.3 V, X5R, 20% 1206 C3216X5R0J226M TDK L1 1 1.5 μH Inductor, SMT, 11 A, 9.7 mΩ 0.256 x 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 10.0 k Resistor, Chip, 1/16W, 1% 0603 Std Std R5 0 Open Resistor, Chip, 1/16W, 1% 0603 Std Std U1 1 TPS54428DDA IC, 4-A Output Single Sync. Step-Down SO8[DDA] TPS54428DDA TI 6.3 Reference Texas Instruments, TPS54428, 4.5V to 18V Input, 4-A Synchronous Step-Down SWIFT™ Converter With Ecomode™ Data Sheet 7 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision * (December 2011) to Revision A (September 2021) Page • Updated the numbering format for tables, figures, and cross-references throughout the document. ................3 16 TPS54428 Step-Down Converter Evaluation Module User's Guide SLVU578A – DECEMBER 2011 – REVISED SEPTEMBER 2021 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated www.ti.com • Revision History Updated the user's guide title............................................................................................................................. 3 SLVU578A – DECEMBER 2011 – REVISED SEPTEMBER 2021 TPS54428 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated 17 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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