TPS54331EVM-232

www.ti.com Table of Contents User’s Guide TPS54331 Step-Down Converter Evaluation Module User's Guide Table of Contents 1 Introduction.............................................................................................................................................................................2 1.1 Background........................................................................................................................................................................ 2 1.2 Performance Specification Summary.................................................................................................................................2 1.3 Modifications...................................................................................................................................................................... 3 2 Test Setup and Results.......................................................................................................................................................... 4 2.1 Input and Output Connections........................................................................................................................................... 4 2.2 Efficiency............................................................................................................................................................................4 2.3 Output Voltage Load Regulation........................................................................................................................................ 5 2.4 Output Voltage Line Regulation......................................................................................................................................... 7 2.5 Load Transients..................................................................................................................................................................7 2.6 Loop Characteristics.......................................................................................................................................................... 8 2.7 Output Voltage Ripple........................................................................................................................................................ 8 2.8 Input Voltage Ripple........................................................................................................................................................... 9 2.9 Powering Up.......................................................................................................................................................................9 3 Board Layout......................................................................................................................................................................... 11 3.1 Layout...............................................................................................................................................................................11 4 Schematic and Bill of Materials...........................................................................................................................................13 4.1 Schematic........................................................................................................................................................................ 13 4.2 Bill of Materials.................................................................................................................................................................14 5 Revision History................................................................................................................................................................... 14 List of Figures Figure 2-1. TPS54331 Efficiency................................................................................................................................................. 5 Figure 2-2. TPS54331 Low Current Efficiency.............................................................................................................................5 Figure 2-3. TPS54331 Load Regulation...................................................................................................................................... 6 Figure 2-4. TPS54331 Line Regulation....................................................................................................................................... 7 Figure 2-5. TPS54331 Transient Response................................................................................................................................ 7 Figure 2-6. TPS54331 Loop Response....................................................................................................................................... 8 Figure 2-7. TPS54331 Output Ripple.......................................................................................................................................... 8 Figure 2-8. TPS54331 Input Ripple............................................................................................................................................. 9 Figure 2-9. TPS54331 Start-Up Relative to VIN .......................................................................................................................... 9 Figure 2-10. TPS5331 Start-Up Relative to Enable...................................................................................................................10 Figure 3-1. Top-Side Layout.......................................................................................................................................................11 Figure 3-2. Bottom-Side Layout (Looking From Top Side)........................................................................................................ 12 Figure 3-3. Top-Side Assembly..................................................................................................................................................12 Figure 4-1. TPS54331EVM-232 Schematic...............................................................................................................................13 List of Tables Table 1-1. Input Voltage and Output Current Summary...............................................................................................................2 Table 1-2. TPS54331EVM-232 and Performance Specification Summary..................................................................................2 Table 1-3. Output Voltages Available...........................................................................................................................................3 Table 2-1. EVM Connectors and Test Points............................................................................................................................... 4 Table 4-1. TPS54331EVM-232 Bill of Materials.........................................................................................................................14 Trademarks All trademarks are the property of their respective owners. SLVU247A – JULY 2008 – REVISED OCTOBER 2021 Submit Document Feedback TPS54331 Step-Down Converter Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated 1 Introduction www.ti.com 1 Introduction This user's guide contains background information for the TPS54331 as well as support documentation for the TPS54331EVM-232 evaluation module (HPA232). Also included are the performance specifications, the schematic, and the bill of materials for the TPS54331EVM-232. 1.1 Background The TPS54331 DC/DC converter is designed to provide up to a 3-A output from an input voltage source of 3.5 V to 28 V. Table 1-1 gives the rated input voltage and output current range for the evaluation module. This evaluation module is designed to demonstrate the small printed-circuit-board areas that can be achieved when designing with the TPS54331 regulator. The switching frequency is internally set at a nominal 570 kHz. The high-side MOSFET is incorporated inside the TPS54331 package along with the gate drive circuitry. The low drain-to-source on resistance of the MOSFET allows the TPS54331 to achieve high efficiencies and helps keep the junction temperature low at high output currents. The compensation components are external to the integrated circuit (IC), and an external divider allows for an adjustable output voltage. Additionally, the TPS54331 provides adjustable slow start and undervoltage lockout inputs. The absolute maximum input voltage is 30 V for the TPS54331EVM-232. Table 1-1. Input Voltage and Output Current Summary EVM Input Voltage Range Output Current Range TPS54331EVM-232 VIN = 7 V to 28 V 0 A to 3 A 1.2 Performance Specification Summary Table 1-2 provides a summary of the TPS54331EVM-232 performance specifications. Specifications are given for an input voltage of VIN = 15 V and an output voltage of 3.3 V, unless otherwise specified. The TPS54331EVM-232 is designed and tested for VIN = 10 V to 35 V. The ambient temperature is 25°C for all measurements, unless otherwise noted. Table 1-2. TPS54331EVM-232 and Performance Specification Summary Specification Test Conditions VIN voltage range MIN 7 Output voltage set point MAX 15 28 3.3 Output current range VIN = 7 V to 28 V Line regulation IO = 1.5 A, VIN = 7 V–28 V ±0.2% Load regulation VIN = 14 V, IO = 0 A to 3 A ±0.15% Load transient response IO = 0.75 A to 2.25 A IO = 2.25 A to 0.75 A 0 Loop bandwidth VIN = 25 V, IO = 1 A Phase margin VIN = 25 V , IO = 1 A Input ripple voltage IO = 3 A Output ripple voltage IO = 3 A V V 3 A –100 Recovery time 160 μs Voltage change 100 mV Output rise time Operating frequency Maximum efficiency Unit Voltage change Recovery time 2 TYP VIN = 10 V, VO = 5 V, IO = 0.75 A TPS54331 Step-Down Converter Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated mV 160 μs 25.0 kHz 58 ° 200 mVpp 10 mVpp 3.5 ms 570 kHz 91.6% SLVU247A – JULY 2008 – REVISED OCTOBER 2021 Submit Document Feedback www.ti.com Introduction 1.3 Modifications These evaluation modules are designed to provide access to the features of the TPS54331. Some modifications can be made to this module. 1.3.1 Output Voltage Set Point To change the output voltage of the EVMs, change the value of resistor R6. Changing the value of R6 can change the output voltage above 0.8 V. The value of R6 for a specific output voltage can be calculated using Equation 1. R2 10 k V 1.221 V 1.221 V O (1) Table 1-3 lists the R6 values for some common output voltages. Note that VIN must be in a range so that the minimum on time is greater than 150 ns, and the maximum duty cycle is less than 93%. The values given in Table 1-3 are standard values, not the exact value calculated using Table 1-3. Table 1-3. Output Voltages Available Output Voltage (V) R2 Value (kΩ) 1.8 8.25 2.5 4.75 3.3 3.24 5 1.96 SLVU247A – JULY 2008 – REVISED OCTOBER 2021 Submit Document Feedback TPS54331 Step-Down Converter Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated 3 Test Setup and Results www.ti.com 2 Test Setup and Results This section describes how to properly connect, set up, and use the TPS54331EVM-232 and evaluation modules. The section also includes test results typical for the evaluation modules and covers the following: • • • • • • • Efficiency Output voltage regulation Load transients Loop response Output ripple Input ripple Start-up 2.1 Input and Output Connections The TPS54331EVM-232 is provided with input and output connectors and test points as shown in Table 2-1. 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 J4 through a pair of 20 AWG wires. The maximum load current capability must be 3 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. TP5 is used to monitor the output voltage with TP6 as the ground reference. Table 2-1. EVM Connectors and Test Points Reference Designator Function J1 VIN (see Table 1-1 for VIN range) J2 2-pin header for enable. Connect EN to ground to disable, open to enable. J3 2-pin header for slow-start monitor and GND J4 VOUT, 3.3 V at 3-A maximum TP1 VIN test point at VIN connector TP2 GND test point at VIN TP3 PH test point TP4 Test point between voltage divider network and R3. Used for loop response measurements. TP5 Output voltage test point at OUT connector TP6 GND test point at OUT connector 2.2 Efficiency The efficiency of this EVM peaks at a load current of about 0.6 A–1 A and then decreases as the load current increases towards full load. Figure 2-1 shows the efficiency for the TPS54331EVM-232 at an ambient temperature of 25°C. 4 TPS54331 Step-Down Converter Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated SLVU247A – JULY 2008 – REVISED OCTOBER 2021 Submit Document Feedback www.ti.com Test Setup and Results 100 VIN = 7 V 90 80 VIN = 21 V Efficiency - % 70 VIN = 14 V VIN = 28 V 60 50 40 30 20 10 0 0 0.5 2 1 1.5 IO - Output Current - A 2.5 3 Figure 2-1. TPS54331 Efficiency Figure 2-2 shows the efficiency for the TPS54331EVM-232 at lower output currents between 0.01 A and 0.20 A at an ambient temperature of 25°C. 100 VIN = 7 V VIN = 14 V 90 80 Efficiency - % 70 60 VIN = 28 V VIN = 21 V 50 40 30 20 10 0 0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 0.2 IO - Output Current - A Figure 2-2. TPS54331 Low Current Efficiency The efficiency can be lower at higher ambient temperatures due to temperature variation in the drain-to-source resistance of the MOSFETs. 2.3 Output Voltage Load Regulation Figure 2-3 shows the TPS54331EVM-232 load regulation. SLVU247A – JULY 2008 – REVISED OCTOBER 2021 Submit Document Feedback TPS54331 Step-Down Converter Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated 5 Test Setup and Results www.ti.com 1.004 1.0035 Output Regulation - % 1.003 1.0025 1.002 VIN = 28 V 1.0015 VIN = 21 V 1.001 VIN = 7 V 1.0005 1 VIN = 14 V 0.9995 0.999 0.9985 0 0.5 1 1.5 2 2.5 IO - Output Current - A 3 3.5 Figure 2-3. TPS54331 Load Regulation Measurements are given for an ambient temperature of 25°C. 6 TPS54331 Step-Down Converter Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated SLVU247A – JULY 2008 – REVISED OCTOBER 2021 Submit Document Feedback www.ti.com Test Setup and Results 2.4 Output Voltage Line Regulation Figure 2-4 shows the TPS54331EVM-232 line regulation. 3.38 IO = 0 A 3.37 VO - Output Voltage - V 3.36 3.35 IO = 1.5 A IO = 3 A 3.34 3.33 3.32 3.31 3.3 3.29 3.28 0 5 10 15 20 VI - Input Voltage -V 25 30 Figure 2-4. TPS54331 Line Regulation 2.5 Load Transients Figure 2-5 shows the TPS54331EVM-232 response to load transients. The current step is from 25% to 75% of maximum rated load. Total peak-to-peak voltage variation is as shown, including ripple and noise on the output. VOUT Output Current t - Time - 200 ms/div Figure 2-5. TPS54331 Transient Response SLVU247A – JULY 2008 – REVISED OCTOBER 2021 Submit Document Feedback TPS54331 Step-Down Converter Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated 7 Test Setup and Results www.ti.com 2.6 Loop Characteristics 70 210 60 180 50 150 40 120 30 90 20 60 10 30 0 0 -10 -30 -20 -60 -30 10 100 1k 10k f - Frequency - Hz Phase - deg Gain - dB Figure 2-6 shows the TPS54331EVM-232 loop response characteristics. Gain and phase plots are shown for VIN voltage of 15 V. Load current for the measurement is 1.5 A. -90 1M 100k Figure 2-6. TPS54331 Loop Response 2.7 Output Voltage Ripple Figure 2-7 shows the TPS54331EVM-232 output voltage ripple. The output current is the rated full load of 3 A. Voltage is measured directly across output capacitors.Figure 2-7 VOUT PH t - Time - 1 ms/div Figure 2-7. TPS54331 Output Ripple 8 TPS54331 Step-Down Converter Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated SLVU247A – JULY 2008 – REVISED OCTOBER 2021 Submit Document Feedback www.ti.com Test Setup and Results 2.8 Input Voltage Ripple Figure 2-8 shows the TPS54331EVM-232 input voltage ripple. The output current for each device is at full rated load of 3 A. VIN PH t - Time - 1 ms/div Figure 2-8. TPS54331 Input Ripple 2.9 Powering Up Figure 2-9 and Figure 2-10 shows the start-up waveform. In Figure 2-9, the top trace shows VIN, and the bottom trace shows VOUT. InFigure 2-9, the top trace shows EN (enable) whereas the bottom trace shows VOUT. Initially, the input voltage is applied and the output is inhibited by using a jumper at J2 to tie EN to GND. When the jumper is removed, EN is released. When the EN voltage reaches the enable-threshold voltage of 1.25 V, the start-up sequence begins and the internal reference voltage begins to ramp up at the internally set rate toward 0.8 V and the output voltage ramps up to the externally set value of 3.3 V. VIN VOUT t - Time - 5 ms/div Figure 2-9. TPS54331 Start-Up Relative to VIN SLVU247A – JULY 2008 – REVISED OCTOBER 2021 Submit Document Feedback TPS54331 Step-Down Converter Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated 9 Test Setup and Results www.ti.com ENA VOUT t - Time - 5 ms/div Figure 2-10. TPS5331 Start-Up Relative to Enable 10 TPS54331 Step-Down Converter Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated SLVU247A – JULY 2008 – REVISED OCTOBER 2021 Submit Document Feedback www.ti.com Board Layout 3 Board Layout This section provides a description of the TPS54331EVM-232, board layout, and layer illustrations. 3.1 Layout Figure 3-1 through Figure 3-3 show the TPS54331EVM-232 board layout. The top-side layer of the EVM is laid out in a manner typical of a user application. The top and bottom layers are 2-oz. copper. The top layer contains the main power traces for VIN, OUT, and VPHASE. Also on the top layer are connections for the remaining pins of the TPS54331 and a large area filled with ground. The bottom layer contains ground and a signal route for the BOOT capacitor. The top and bottom and internal ground traces are connected with multiple vias placed around the board including four vias directly under the TPS54331 device to provide a thermal path from the top-side ground traces to the bottom-side ground plane. The input decoupling capacitors (C1, C2, and C3) and bootstrap capacitor (C4) are all located as close to the IC as possible. In addition, the voltage set-point resistor divider components are also kept close to the IC. The voltage divider network ties to the output voltage at the point of regulation, the copper VOUT trace past the output capacitor C3. For the TPS54331, an additional input bulk capacitor can be required, depending on the EVM connection to the input supply. Figure 3-1. Top-Side Layout SLVU247A – JULY 2008 – REVISED OCTOBER 2021 Submit Document Feedback TPS54331 Step-Down Converter Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated 11 Board Layout www.ti.com Figure 3-2. Bottom-Side Layout (Looking From Top Side) Figure 3-3. Top-Side Assembly 12 TPS54331 Step-Down Converter Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated SLVU247A – JULY 2008 – REVISED OCTOBER 2021 Submit Document Feedback www.ti.com Schematic and Bill of Materials 4 Schematic and Bill of Materials This section presents the TPS54331EVM-232 schematic and bill of materials. 4.1 Schematic + Figure 4-1 is the schematic for the TPS54331EVM-232. Figure 4-1. TPS54331EVM-232 Schematic SLVU247A – JULY 2008 – REVISED OCTOBER 2021 Submit Document Feedback TPS54331 Step-Down Converter Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated 13 Schematic and Bill of Materials www.ti.com 4.2 Bill of Materials Table 4-1 presents the bill of materials for the TPS54331EVM-232.. Table 4-1. TPS54331EVM-232 Bill of Materials Coun t Ref Des 2 C1, C2 0 C10 1 Value Description 4.7 μF Capacitor, Ceramic, 50 V, X7R, 20% C3 0.01 μF Capacitor, Ceramic, 50 V, X7R, 10% 1 C4 0.1 μF 1 C5 0.01 μF 1 C6 1 C7 2 1 Size Part Number Mfr 1210 Std Std 7343(D) Std Std 0603 Std Std Capacitor, Ceramic, 16 V, X7R, 10% 0603 Std Std Capacitor, Ceramic, 16 V, X7R, 10% 0603 Std Std 1000 pF Capacitor, Ceramic, 16 V, X7R, 10% 0603 Std Std 47 pF Capacitor, Ceramic, 16 V, X7R, 10% 0603 Std Std C8, C9 47 μF Capacitor, Ceramic, 6.3, X5R, 20% 1206 C3216X5R0J476MT TDK D1 B340A Diode, Schottky, 3 A, 40 V SMA B340A Diodes Inc 2 J1, J4 ED1514 Terminal Block, 2-pin, 6 A, 3.5 mm 0.27 × 0.25 inch ED1514 2 J2, J3 PTC36SA Header, 2-pin, 100-mil spacing, (36-pin strip) AN 0.100 × 2 PTC36SAAN 1 L1 6.8 μH Inductor, SMT, 3.84 A, 35 mΩ 0.406 × 0.409 CDRH103RNP-6R8 Sumida 1 R1 332 k Resistor, Chip, 1/16W, 1% 0603 Std Std 1 R2 68.1 k Resistor, Chip, 1/16W, 1% 0603 Std Std 1 R3 29.4 k Resistor, Chip, 1/16W, 1% 0603 Std Std 1 R4 0 Resistor, Chip, 1/16W, 1% 0603 Std Std 1 R5 10.2 k Resistor, Chip, 1/16W, 1% 0603 Std Std 1 R6 3.24 k Resistor, Chip, 1/16W, 1% 0603 Std Std 0 R7 Resistor, Chip, 1/16W, 1% 0603 Std Std 3 TP1, TP3, TP5 5000 Test Point, Red, Thru Hole Color Keyed 0.100 × 0.100 inch 5000 Keystone 3 TP2, TP4, TP6 5001 Test Point, Black, Thru Hole Color Keyed 0.100 × 0.100 inch 5001 Keystone SO-8 TPS54331D TI 1 U1 TPS5433x IC, DC-DC Converter, 28 V, 3 A D OST 1 — PCB, HPA232 2.0" × 2.0" × 0.062" HPA232 Any 2 — Shunt, 100-mil, Black 0.100 929950-00 3M 5 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision * (July 2008) to Revision A (October 2021) Page • Updated the numbering format for tables, figures, and cross-references throughout the document. ................2 • Updated the user's guide title............................................................................................................................. 2 14 TPS54331 Step-Down Converter Evaluation Module User's Guide Copyright © 2022 Texas Instruments Incorporated SLVU247A – JULY 2008 – REVISED OCTOBER 2021 Submit Document Feedback 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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