TPS54429EEVM-608

www.ti.com Table of Contents User’s Guide TPS54429E Step-Down Converter Evaluation Module User's Guide ABSTRACT This user’s guide contains background information for the TPS54429E as well as support documentation for the TPS54429EEVM-608 evaluation module. Also included are the performance specifications, schematic and the bill of materials for the TPS54429EEVM-608. Table of Contents 1 Introduction.............................................................................................................................................................................3 2 Performance Specification Summary................................................................................................................................... 4 3 Modifications...........................................................................................................................................................................5 3.1 Output Voltage Setpoint..................................................................................................................................................... 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 Light Load Efficiency.......................................................................................................................................................... 7 4.5 Load Regulation................................................................................................................................................................. 8 4.6 Line Regulation.................................................................................................................................................................. 8 4.7 Load Transient Response.................................................................................................................................................. 9 4.8 Output Voltage Ripple........................................................................................................................................................ 9 4.9 Input Voltage Ripple......................................................................................................................................................... 10 4.10 Start-Up..........................................................................................................................................................................10 4.11 Eco-mode™ Operation....................................................................................................................................................11 5 Test Setup and Results........................................................................................................................................................ 12 6 Board Layout.........................................................................................................................................................................14 6.1 Layout.............................................................................................................................................................................. 14 7 Schematic, Bill of Materials, and Reference...................................................................................................................... 18 7.1 Schematic........................................................................................................................................................................ 18 7.2 Bill of Materials.................................................................................................................................................................18 7.3 Reference.........................................................................................................................................................................18 8 Revision History................................................................................................................................................................... 18 List of Figures Figure 4-1. TPS54429EEVM-608 Efficiency................................................................................................................................7 Figure 4-2. TPS54429EEVM-608 Light Load Efficiency.............................................................................................................. 7 Figure 4-3. TPS54429EEVM-608 Load Regulation.....................................................................................................................8 Figure 4-4. TPS54429EEVM-608 Line Regulation...................................................................................................................... 8 Figure 4-5. TPS54429EEVM-608 Load Transient Response...................................................................................................... 9 Figure 4-6. TPS54429EEVM-608 Output Voltage Ripple............................................................................................................ 9 Figure 4-7. TPS54429EEVM-608 Input Voltage Ripple.............................................................................................................10 Figure 4-8. TPS54429EEVM-608 Start-Up................................................................................................................................10 Figure 5-1. TPS54429EEVM-608 Start-Up Relative to Enable................................................................................................. 12 Figure 5-2. TPS54329EEVM-608 Normal Switching................................................................................................................. 12 Figure 5-3. TPS54429EEVM-608 Entering Eco-mode™ Operation...........................................................................................13 Figure 5-4. TPS54429EEVM-608 Fully in Eco-mode™ Operation.............................................................................................13 Figure 6-1. Top Assembly.......................................................................................................................................................... 14 Figure 6-2. Top Layer.................................................................................................................................................................15 Figure 6-3. Internal Layer 1....................................................................................................................................................... 15 Figure 6-4. Internal Layer 2....................................................................................................................................................... 16 SLVU444A – MARCH 2011 – REVISED AUGUST 2021 Submit Document Feedback TPS54429E Step-Down Converter Evaluation Module User's Guide Copyright © 2021 Texas Instruments Incorporated 1 Trademarks www.ti.com Figure 6-5. Bottom Layer as Seen From Back Side.................................................................................................................. 16 Figure 6-6. Bottom Assembly as Seen From Back Side............................................................................................................17 Figure 7-1. TPS54429EEVM-608 Schematic Diagram..............................................................................................................18 List of Tables Table 1-1. Input Voltage and Output Current Summary...............................................................................................................3 Table 2-1. TPS54429E EVM and Performance Specifications Summary....................................................................................4 Table 3-1. Output Voltages.......................................................................................................................................................... 5 Table 4-1. Connection and Test Points........................................................................................................................................ 6 Table 7-1. Bill of Materials..........................................................................................................................................................18 Trademarks Eco-mode™ and D-CAP2™, are trademarks of TI. All trademarks are the property of their respective owners. 2 TPS54429E Step-Down Converter Evaluation Module User's Guide Copyright © 2021 Texas Instruments Incorporated SLVU444A – MARCH 2011 – REVISED AUGUST 2021 Submit Document Feedback www.ti.com Introduction 1 Introduction The TPS54429E is a single, adaptive on-time D-CAP2™ mode synchronous buck converter requiring 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 TPS54429E package along with the gate drive circuitry. The low drain-to-source on resistance of the MOSFETs allows the TPS54429E to achieve high efficiencies and helps keep the junction temperature low at high output currents. The TPS54429E also has an auto-skip Eco-mode™ to enable higher efficiency at light loads. The TPS54429E 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 voltage and output current range for the evaluation module are given in Table 1-1. Table 1-1. Input Voltage and Output Current Summary EVM Input Voltage Range Output Voltage and Current Range TPS54429EEVM-608 VIN = 7 V to 18 V VOUT = 1.05 V, 0 A to 4.5 A SLVU444A – MARCH 2011 – REVISED AUGUST 2021 Submit Document Feedback TPS54429E Step-Down Converter Evaluation Module User's Guide Copyright © 2021 Texas Instruments Incorporated 3 Performance Specification Summary www.ti.com 2 Performance Specification Summary A summary of the TPS54429EEVM-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. TPS54429E EVM and Performance Specifications Summary Specifications Test Conditions Input voltage range (VIN) Min Typ Max 7 12 18 Output voltage Operating frequency CH1 4 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 A 10 mVPP TPS54429E Step-Down Converter Evaluation Module User's Guide Copyright © 2021 Texas Instruments Incorporated SLVU444A – MARCH 2011 – REVISED AUGUST 2021 Submit Document Feedback www.ti.com Modifications 3 Modifications These evaluation modules are designed to provide access to the feature of the TPS54429E. Some modification 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: æ R1 ö VO = (0.763 + 0.0017 ´ VO ) ´ ç 1+ ÷ è R2 ø (2) Table 3-1 lists the R1 value for some common output voltages. For higher output voltages of 1.8 V or above, a feedforward capacitor (C2) may be required to improve phase margin and is recommended for auto skip Eco-mode™ stability. 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 SLVU444A – MARCH 2011 – REVISED AUGUST 2021 Submit Document Feedback TPS54429E Step-Down Converter Evaluation Module User's Guide Copyright © 2021 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 TPS54429EEVM-608. The section also includes test results typical for the evaluation modules and efficiency, output load regulation, output line regulation, load transient response, output voltage ripple, input voltage ripple, start-up and switching frequency. 4.1 Input / Output Connections The TPS54429EEVM-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. Make sure 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 TPS54429E Step-Down Converter Evaluation Module User's Guide Copyright © 2021 Texas Instruments Incorporated SLVU444A – MARCH 2011 – REVISED AUGUST 2021 Submit Document Feedback www.ti.com Test Setup and Results 4.3 Efficiency Figure 4-1 shows the efficiency for the TPS54429EEVM-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 1.5 2 2.5 3 3.5 4 4.5 Output Current - A Figure 4-1. TPS54429EEVM-608 Efficiency 4.4 Light Load Efficiency Figure 4-2 shows the efficiency at light loads for the TPS54429EEVM-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 Output Current - A 1 10 Figure 4-2. TPS54429EEVM-608 Light Load Efficiency SLVU444A – MARCH 2011 – REVISED AUGUST 2021 Submit Document Feedback TPS54429E Step-Down Converter Evaluation Module User's Guide Copyright © 2021 Texas Instruments Incorporated 7 Test Setup and Results www.ti.com 4.5 Load Regulation The load regulation for the TPS54429EEVM-608 is shown Figure 4-3. The input voltage is 12 V. 2 1.5 Output Voltage Deviation - % 1 0.5 0 -0.5 -1 -1.5 -2 0 0.5 1 1.5 2 2.5 Output Current - A 3 3.5 4 4.5 Figure 4-3. TPS54429EEVM-608 Load Regulation 4.6 Line Regulation The line regulation for the TPS54429EEVM-608 is shown Figure 4-4. the load current is 2.25 A. 0.5 0.4 Output Voltage Deviation - % 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 6 9 12 Input Voltage - V 15 18 Figure 4-4. TPS54429EEVM-608 Line Regulation 8 TPS54429E Step-Down Converter Evaluation Module User's Guide Copyright © 2021 Texas Instruments Incorporated SLVU444A – MARCH 2011 – REVISED AUGUST 2021 Submit Document Feedback www.ti.com Test Setup and Results 4.7 Load Transient Response The TPS54429EEVM-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 output voltage variation is as shown. VOUT = 20 mV / div (dc coupled, -1.013 V offset) IOUT = 2 A / div Load step = 1.25 to 3.25 A Slew rate = 100 mA / µsec Time = 100 µsec / div Figure 4-5. TPS54429EEVM-608 Load Transient Response 4.8 Output Voltage Ripple The TPS54429EEVM-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. TPS54429EEVM-608 Output Voltage Ripple SLVU444A – MARCH 2011 – REVISED AUGUST 2021 Submit Document Feedback TPS54429E Step-Down Converter Evaluation Module User's Guide Copyright © 2021 Texas Instruments Incorporated 9 Test Setup and Results www.ti.com 4.9 Input Voltage Ripple The TPS54429EEVM-608 input voltage ripple is shown in Figure 4-7. The output current is the rated full load of 4.5 A. VIN = 100 mV / div (ac coupled) PH = 5 V / div Time = 500 nsec / div Figure 4-7. TPS54429EEVM-608 Input Voltage Ripple 4.10 Start-Up The TPS54429EEVM-608 start-up waveform relative to VIN is shown in Figure 4-8. VIN = 5 V / div VOUT = 500 mV / div Time = 2 msec / div Figure 4-8. TPS54429EEVM-608 Start-Up The TPS54429EEVM-608 start-up waveform relative to enable (EN) is shown in Figure 5-1. 10 TPS54429E Step-Down Converter Evaluation Module User's Guide Copyright © 2021 Texas Instruments Incorporated SLVU444A – MARCH 2011 – REVISED AUGUST 2021 Submit Document Feedback www.ti.com Test Setup and Results 4.11 Eco-mode™ Operation The waveforms Figure 5-2, Figure 5-3 and Figure 5-4in show the Eco-mode™ operation of the TPS54429E. In Figure 5-2, the circuit is switching normally with the inductor current always positive. SLVU444A – MARCH 2011 – REVISED AUGUST 2021 Submit Document Feedback TPS54429E Step-Down Converter Evaluation Module User's Guide Copyright © 2021 Texas Instruments Incorporated 11 Test Setup and Results www.ti.com 5 Test Setup and Results VIN = 5 V / div EN = 10 V / div VOUT = 1 V / div Time = 2 msec / div Figure 5-1. TPS54429EEVM-608 Start-Up Relative to Enable VOUT = 20 mV / div (ac coupled) PH = 5 V / div Inductor Current = 2 A / div Time = 1 µsec / div Figure 5-2. TPS54329EEVM-608 Normal Switching When the inductor current falls to zero, Eco-mode™ operation begins. The TPS54329E enters a power-saving skip mode. Switching resumes when the fedback voltage at VFB falls below an internally set threshold. Figure 5-3 shows the switching activity as the circuit is just entering Eco-mode™ operation. The effective switching period increases slightly as the pulse-skipping time is short. In Figure 5-4, the load current is reduced further, and the skip time is longer. 12 TPS54429E Step-Down Converter Evaluation Module User's Guide Copyright © 2021 Texas Instruments Incorporated SLVU444A – MARCH 2011 – REVISED AUGUST 2021 Submit Document Feedback www.ti.com Test Setup and Results VOUT = 20 mV / div (ac coupled) PH = 5 V / div Inductor Current = 2 A / div Time = 1 µsec / div Figure 5-3. TPS54429EEVM-608 Entering Eco-mode™ Operation VOUT = 20 mV / div (ac coupled) PH = 5 V / div Inductor Current = 2 A / div Time = 10 µsec / div Figure 5-4. TPS54429EEVM-608 Fully in Eco-mode™ Operation SLVU444A – MARCH 2011 – REVISED AUGUST 2021 Submit Document Feedback TPS54429E Step-Down Converter Evaluation Module User's Guide Copyright © 2021 Texas Instruments Incorporated 13 Board Layout www.ti.com 6 Board Layout This section provides description of the TPS54429EEVM-608, board layout, and layer illustrations. 6.1 Layout The board layout for the TPS54429EEVM-608 and is shown in Figure 6-1 through Figure 6-6. 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 TPS54429E and a large area filled with ground. Most of the signal traces are also located on the top side. The input decoupling capacitor are located as close to the integrated circuit 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 TPS54429E. The internal layer 1 is a split plane containing analog and power grounds. The internal layer 2 is primarily power ground. Also, a fill area of VIN and a trace routing VIN enables the control jumper JP1. The bottom layer is primarily analog ground. Traces also connect VIN, the power-good signal, and a feedback trace from VOUT connects to the voltage setpoint divider network. Figure 6-1. Top Assembly 14 TPS54429E Step-Down Converter Evaluation Module User's Guide Copyright © 2021 Texas Instruments Incorporated SLVU444A – MARCH 2011 – REVISED AUGUST 2021 Submit Document Feedback www.ti.com Board Layout Figure 6-2. Top Layer Figure 6-3. Internal Layer 1 SLVU444A – MARCH 2011 – REVISED AUGUST 2021 Submit Document Feedback TPS54429E Step-Down Converter Evaluation Module User's Guide Copyright © 2021 Texas Instruments Incorporated 15 Board Layout www.ti.com Figure 6-4. Internal Layer 2 Figure 6-5. Bottom Layer as Seen From Back Side 16 TPS54429E Step-Down Converter Evaluation Module User's Guide Copyright © 2021 Texas Instruments Incorporated SLVU444A – MARCH 2011 – REVISED AUGUST 2021 Submit Document Feedback www.ti.com Board Layout Figure 6-6. Bottom Assembly as Seen From Back Side SLVU444A – MARCH 2011 – REVISED AUGUST 2021 Submit Document Feedback TPS54429E Step-Down Converter Evaluation Module User's Guide Copyright © 2021 Texas Instruments Incorporated 17 Schematic, Bill of Materials, and Reference www.ti.com 7 Schematic, Bill of Materials, and Reference This section presents the TPS54429EEVM-608 schematic, bill of materials, and reference. 7.1 Schematic Figure 7-1 is the schematic for the TPS54429EEVM. Figure 7-1. TPS54429EEVM-608 Schematic Diagram 7.2 Bill of Materials Table 7-1. Bill of Materials RefDes QTY Value Description Size Part Number MFR C1, C3 2 10uF Capacitor, Ceramic, 25V, X5R, 20% 1210 C3225X5R1E106M TDK C11 0 Open Capacitor, Ceramic 1206 Std Std C2, C8 0 Open Capacitor, Ceramic 0603 Std Std C4, C7 2 0.1uF Capacitor, Ceramic, 50V, X7R, 10% C5 1 3300pF Capacitor, Ceramic, 25V, X7R , 10% 0603 Std Std C6 1 1.0uF Capacitor, Ceramic, 16V, X7R, 10% 0603 Std Std C9, C10 2 22uF Capacitor, Ceramic, 6.3V, X5R, 20% 1206 C3216X5R0J226M TDK J1, J2 2 ED555/2DS Terminal Block, 2-pin, 6-A, 3.5mm 0.27 x 0.25 inch ED555/2DS Sullins JP1 1 PEC03SAAN Header, Male 3-pin, 100mil spacing 0.100 inch x 3 PEC03SAAN Sullins L1 1 1.5uH Inductor, SMT, 11A, 9.7 milliohm 0.256 x 0.280 inch SPM6530T-1R5M100 TDK R1 1 8.25k Resistor, Chip, 1/16W, 1% 0603 Std Std R2 1 22.1k Resistor, Chip, 1/16W, 1% 0603 Std Std R3 1 0 Resistor, Chip, 1/16W, 1% 0603 Std Std R4 1 100k Resistor, Chip, 1/16W, 1% 0603 Std Std R5 0 Open Resistor, Chip, 1/16W, 1% 0603 Std Std TP1, TP3, TP5, TP6, TP7 5 5000 Test Point, Red, Thru Hole Color Keyed 0.100 x 0.100 inch 5000 Keystone TP2, TP5, TP8 3 5001 Test Point, Black, Thru Hole Color Keyed 0.100 x 0.100 inch 5001 Keystone U1 1 TPS54429EPWP IC, 4.5-A Output Single Sync. Step-Down TPS54429EPWP TI – 1 Shunt, 100-mil, Black 929950-00 3M – 1 PCB, 2.76 In x 1.97 In x 0.062 In HPA608 Any 0.100 7.3 Reference Texas Instruments, TPS54429E, 7V to 18V Input, 4.5-A Synchronous Step-Down SWIFT”™ Converter with Eco-Mode™ Data Sheet 8 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. 18 TPS54429E Step-Down Converter Evaluation Module User's Guide Copyright © 2021 Texas Instruments Incorporated SLVU444A – MARCH 2011 – REVISED AUGUST 2021 Submit Document Feedback www.ti.com Revision History Changes from Revision * (March 2011) to Revision A (August 2021) Page • Updated the numbering format for tables, figures, and cross-references throughout the document. ................3 • Updated the user's guide title............................................................................................................................. 3 SLVU444A – MARCH 2011 – REVISED AUGUST 2021 Submit Document Feedback TPS54429E Step-Down Converter Evaluation Module User's Guide Copyright © 2021 Texas Instruments Incorporated 19 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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