TPS54A20EVM-770

www.ti.com Table of Contents User’s Guide TPS54A20 SWIFT™ Step-Down Converter Evaluation Module User's Guide ABSTRACT This user’s guide contains information for the TPS54A20EVM-770 evaluation module (PWR770) as well as for the TPS54A20 dc/dc converter. Also included are the performance specifications, the schematic, and the bill of materials for the TPS54A20EVM-770. Table of Contents 1 Introduction.............................................................................................................................................................................2 2 Test Setup and Results.......................................................................................................................................................... 4 3 Board Layout.........................................................................................................................................................................14 4 Schematic and Bill of Materials...........................................................................................................................................15 5 Revision History................................................................................................................................................................... 18 List of Figures Figure 2-1. TPS54A20EVM-770 Efficiency..................................................................................................................................6 Figure 2-2. TPS54A20EVM-770 Low Current Efficiency............................................................................................................. 6 Figure 2-3. TPS54A20EVM-770 Load Regulation.......................................................................................................................7 Figure 2-4. TPS54A20EVM-770 Line Regulation........................................................................................................................ 7 Figure 2-5. TPS54A20EVM-770 Transient Response................................................................................................................. 8 Figure 2-6. TPS54A20EVM-770 Loop Response........................................................................................................................8 Figure 2-7. TPS54A20EVM-770 Output Ripple, 0 A Load...........................................................................................................9 Figure 2-8. TPS54A20EVM-770 Output Ripple, 5 A Load...........................................................................................................9 Figure 2-9. TPS54A20EVM-770 Output Ripple, 10 A Load.......................................................................................................10 Figure 2-10. TPS54A20EVM-770 Input Ripple, 0 A Load......................................................................................................... 10 Figure 2-11. TPS54A20EVM-770 Input Ripple, 5 A Load.......................................................................................................... 11 Figure 2-12. TPS54A20EVM-770 Input Ripple, 10 A Load........................................................................................................11 Figure 2-13. TPS54A20EVM-770 Start-Up Relative to VIN .......................................................................................................12 Figure 2-14. TPS54A20EVM-770 Start-Up Relative to Enable................................................................................................. 12 Figure 2-15. Thermal Image...................................................................................................................................................... 13 Figure 3-1. TPS54A20EVM-770 Top-Side Assembly................................................................................................................ 14 Figure 3-2. TPS54A20EVM-770 Top-Side Layout..................................................................................................................... 14 Figure 3-3. TPS54A20EVM-770 Internal Layer-1 Layout.......................................................................................................... 14 Figure 3-4. TPS54A20EVM-770 Internal Layer-2 Layout.......................................................................................................... 14 Figure 3-5. TPS54A20EVM-770 Bottom-Side Layout............................................................................................................... 15 Figure 4-1. TPS54A20EVM-770 Schematic.............................................................................................................................. 16 List of Tables Table 1-1. Input Voltage and Output Current Summary...............................................................................................................3 Table 1-2. TPS54A20EVM-770 Performance Specification Summary........................................................................................ 3 Table 2-1. EVM Connectors and Test Points............................................................................................................................... 4 Table 4-1. TPS54A20EVM-770 Bill of Materials........................................................................................................................ 16 Trademarks All trademarks are the property of their respective owners. SLVUAM8B – DECEMBER 2015 – REVISED AUGUST 2021 TPS54A20 SWIFT™ Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 1 Introduction www.ti.com 1 Introduction 1.1 Before You Begin The following warnings and cautions are noted for the safety of anyone using or working close to the TPS54A20EVM-770. Observe all safety precautions. Warning The TPS54A20EVM-770 circuit module may become hot during operation due to dissipation of heat. Avoid contact with the board. Follow all applicable safety procedures applicable to your laboratory. Caution Do not leave the EVM powered when unattended. ! WARNING The circuit module has signal traces, components, and component leads on the bottom of the board. This may result in exposed voltages, hot surfaces or sharp edges. Do not reach under the board during operation. CAUTION The circuit module may be damaged by over temperature. To avoid damage, monitor the temperature during evaluation and provide cooling, as needed, for your system environment. CAUTION Some power supplies can be damaged by application of external voltages. If using more than 1 power supply, check your equipment requirements and use blocking diodes or other isolation techniques, as needed, to prevent damage to your equipment. 2 TPS54A20 SWIFT™ Step-Down Converter Evaluation Module User's Guide SLVUAM8B – DECEMBER 2015 – REVISED AUGUST 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Introduction 1.2 Background The TPS54A20 dc/dc converter is a two-phase synchronous series capacitor buck converter designed to provide up to a 10-A output. The input (VIN) is rated for 8 V to 14 V. Rated input voltage and output current range for the evaluation module are given in Table 1-1. This evaluation module is designed to demonstrate the small printedcircuit-board areas that may be achieved when designing with the TPS54A20 regulator. The switching frequency is externally set at a nominal 2 MHz for each side, 4 MHz effective. The high-side and low-side MOSFETs are incorporated inside the TPS54A20 package along with the gate drive circuitry. The low drain-to-source on-resistance of the MOSFET allows the TPS54A20 to achieve high efficiencies and helps keep the junction temperature low at high output currents. The compensation components are internal to the integrated circuit (IC), and an external divider allows for an adjustable output voltage. Additionally, the TPS54A20 provides adjustable slow start and undervoltage lockout inputs. The absolute maximum input voltage is 15 V while switching and 17 V for non-switching conditions. Table 1-1. Input Voltage and Output Current Summary EVM INPUT VOLTAGE RANGE OUTPUT CURRENT RANGE TPS54A20EVM-770 VIN = 9.2 V to 14 V 0 A to 10 A 1.3 Performance Specification Summary A summary of the TPS54A20EVM-770 performance specifications is provided in Table 1-2. Specifications are given for an input voltage of VIN = 12 V and an output voltage of 1.2 V, unless otherwise specified. The TPS54A20EVM-770 is designed and tested for VIN = 9.2 V to 14 V. The ambient temperature is 25°C for all measurements, unless otherwise noted. Table 1-2. TPS54A20EVM-770 Performance Specification Summary SPECIFICATION TEST CONDITIONS VIN voltage range MIN TYP MAX 9.2 12 14 UNIT V VIN start voltage 9.39 V VIN stop voltage 9.14 V Output voltage setpoint 1.2 Output current range VIN = 9.2 V to 14 V Line regulation IO = 5 A, VIN = 9.2 V to 14 V ±0.04% Load regulation VIN = 12 V, IO = 0 A to 10 A ±0.03% IO = 0 A to 9 A Load transient response IO = 9 A to 0 A 0 V 10 A Voltage change –60 mV Recovery time 60 µs Voltage change 60 mV Recovery time 60 µs Loop bandwidth VIN = 12 V, IO = 5 A 280 kHz Phase margin VIN = 12 V , IO = 5 A 45 degree Input ripple voltage IO = 10 A 90 mVPP Output ripple voltage IO = 10 A 20 mVPP Output rise time 512 Operating frequency Maximum efficiency 2 TPS54A20EVM-770, VIN = 9 V, IO = 5 A µs MHz 84.7% 1.4 Modifications These evaluation modules are designed to provide access to the features of the TPS54A20. Some modifications can be made to this module. 1.4.1 Output Voltage Setpoint The output voltage is set by the resistor divider network of R9 (R(TOP)) and R7 (R(BOT)). R7 is fixed at 14.3 kΩ. To change the output voltage of the EVM, it is necessary to change the value of resistor R9. Changing the value SLVUAM8B – DECEMBER 2015 – REVISED AUGUST 2021 TPS54A20 SWIFT™ Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 3 Introduction www.ti.com of R9 can change the output voltage above the 0.508 V reference voltage VREF. The value of R9 for a specific output voltage can be calculated using Equation 1. R (TOP) = R (BOT) x (VOUT - VREF ) VREF (1) 1.4.2 On Time The TON pin requires a resistor to set the nominal on-time and to support the input voltage feed forward circuit. The resistance value used also influences the internal ramp in the controller. Use Equation 2 for selecting the TON resistor. R (TON) = 3 k + 15 k x VOUT (2) The RTON resistor selected for this design example is 22.1 kΩ. During startup, the converter uses the nominal on-time programmed through TON. The phase lock loop (PLL) is only activated after startup is complete. When the PLL is engaged, the on-time is adjusted. If the nominal on-time programmed through the TON pin is not close to the on-time when the PLL is engaged, the SYNC range of the device may be reduced. The TON resistor can also be adjusted to tune the controller. Lowering the RTON value will increase the internal ramp height. This will reduce the converter’s sensitivity to noise and jitter but it will also reduce the transient response capabilities of the converter. 1.4.3 Adjustable UVLO The undervoltage lockout (UVLO) can be adjusted externally using R2 (REN(TOP)) and R3 (REN(BOT)). The EVM is set for a start voltage of 9.385 V and a stop voltage of 9.144 V using R2 = 80.6 kΩ and R3 = 12.4 kΩ. Use Equation 3 and Equation 4 to calculate required resistor values for different start and stop voltages. IEN(FALL) = 4 µA, IEN(RISE) = 1 µA and VEN = 1.23 V REN(TOP) = REN(BOT) = VIN(RISE) - VIN(FALL) IEN(FALL) - IEN(RISE) (3) REN(TOP) x VEN VIN(FALL) - VEN + REN(TOP) x IEN(FALL) (4) 2 Test Setup and Results This section describes how to properly connect, set up, and use the TPS54A20EVM-770 evaluation module. The section also includes test results typical for the evaluation module and covers efficiency, output voltage regulation, load transients, loop response, output ripple, input ripple, and start-up. 2.1 Input/Output Connections The TPS54A20EVM-770 is provided with input/output connectors and test points as shown in Table 2-1. A power supply capable of supplying greater than 2 A must be connected to J1 through a pair of 20 AWG wires or better. The load must be connected to J4 through a pair of 20 AWG wires or better. The maximum load current capability is 10 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 2-1. EVM Connectors and Test Points Reference Designator J1 VIN input voltage connector. (See Table 1-1 for VIN range). J2 2-pin header for enable. Connect EN to ground to disable, open to enable. J3 External VG+ header. To improve converter efficiency, an external 5V supply is recommended to be connected to the VG+ pin (J3-2) to GND (J3-1). J4 VOUT, 1.2 V at 10 A maximum. TP1 4 Function VIN test point. TPS54A20 SWIFT™ Step-Down Converter Evaluation Module User's Guide SLVUAM8B – DECEMBER 2015 – REVISED AUGUST 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Test Setup and Results Table 2-1. EVM Connectors and Test Points (continued) Reference Designator Function TP2 GND test point at VIN connector. TP3 PGOOD test point. TP4 SYNC test point. TP5 VG+ test point. TP6 Test point between voltage divider network and output. Used for loop response measurements. TP7 Output voltage test point. TP8 GND test point TP9 Test point at gate of transient load circuit. TP10 GND test point at input of transient load circuit. TP11 Test point at top of transient load circuit load resistor TP12 Test point at bottom (GND) of transient load circuit load resistor TP13 Analog ground (AGND) test point. SLVUAM8B – DECEMBER 2015 – REVISED AUGUST 2021 TPS54A20 SWIFT™ Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 5 Test Setup and Results www.ti.com 2.2 Efficiency The efficiency of this EVM peaks at a load current of about 5 A and then decreases as the load current increases toward full load. Figure 2-1 shows the efficiency for the TPS54A20EVM-770 at an ambient temperature of 25°C. 100 90 80 Efficiency (%) 70 60 50 40 30 20 VIN = 9V VIN = 12V VIN = 14V 10 0 0 1 2 3 4 5 Output Current (A) 6 7 8 9 10 D001 Figure 2-1. TPS54A20EVM-770 Efficiency Figure 2-2 shows the efficiency for the TPS54A20EVM-770 using a semi-log scale to more easily show efficiency at lower output currents. The ambient temperature is 25°C. 100 90 80 Efficiency (%) 70 60 50 40 30 20 VIN = 9V VIN = 12V VIN = 14V 10 0 0.001 0.01 0.1 Output Current (A) 1 10 D002 Figure 2-2. TPS54A20EVM-770 Low Current Efficiency The efficiency may be lower at higher ambient temperatures, due to temperature variation in the drain-to-source resistance of the internal MOSFET. 6 TPS54A20 SWIFT™ Step-Down Converter Evaluation Module User's Guide SLVUAM8B – DECEMBER 2015 – REVISED AUGUST 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Test Setup and Results 2.3 Output Voltage Load Regulation Figure 2-3 shows the load regulation for the TPS54A20EVM-770. 1 0.8 0.6 Load Regulation (%) 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 0 1 2 3 4 5 Output Current (A) 6 7 8 9 10 D003 Figure 2-3. TPS54A20EVM-770 Load Regulation Measurements are given for an ambient temperature of 25°C. 2.4 Output Voltage Line Regulation Figure 2-4 shows the line regulation for the TPS54A20EVM-770. 0.5 0.4 0.3 Line Regulation (%) 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 9 10 11 12 Input Voltage (V) 13 14 D004 Figure 2-4. TPS54A20EVM-770 Line Regulation SLVUAM8B – DECEMBER 2015 – REVISED AUGUST 2021 TPS54A20 SWIFT™ Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 7 Test Setup and Results www.ti.com 2.5 Load Transients Figure 2-5 shows the TPS54A20EVM-770 response to load transients. The current step is from 0 A to 9 A. The current step slew rate is 9 A/µs. Total peak-to-peak voltage variation is as shown, including ripple and noise on the output. The transient waveform is measured using the on-board fast transient circuit. CAUTION Q1 may get hot. Limit the power dissipation to 3W or less. Use low duty cycles. VO = 50 mV / div (ac coupled) IO = 5 A / div Load step = 0 A - 9 A, slew rate = 9 A / µsec Time = 50 µsec / div Figure 2-5. TPS54A20EVM-770 Transient Response 2.6 Loop Characteristics 60 180 50 150 40 120 30 90 20 60 10 30 0 0 -10 -30 -20 -60 -30 -90 -40 -120 -50 -60 100 Phase (Degrees) Gain (dB) Figure 2-6 shows the TPS54A20EVM-770 loop-response characteristics. Gain and phase plots are shown for VIN voltage of 12 V. Load current for the measurement is 5 A. -150 200 300 500 1000 2000 5000 10000 20000 Frequency (Hz) 50000100000 -180 1000000 EVMU Figure 2-6. TPS54A20EVM-770 Loop Response 8 TPS54A20 SWIFT™ Step-Down Converter Evaluation Module User's Guide SLVUAM8B – DECEMBER 2015 – REVISED AUGUST 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Test Setup and Results 2.7 Output Voltage Ripple Figure 2-7, Figure 2-8, and Figure 2-9 show the TPS54A20EVM-770 output voltage ripple. The load currents are 0 A, 5 A and 10 A. VIN = 12 V. The ripple voltage is measured directly across TP7 and TP8. VO = 20 mV / div (ac coupled) SWA = 5 V / div SWB = 5 V / div Time = 200 nsec / div Figure 2-7. TPS54A20EVM-770 Output Ripple, 0 A Load VO = 20 mV / div (ac coupled) SWA = 5 V / div SWB = 5 V / div Time = 200 nsec / div Figure 2-8. TPS54A20EVM-770 Output Ripple, 5 A Load SLVUAM8B – DECEMBER 2015 – REVISED AUGUST 2021 TPS54A20 SWIFT™ Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 9 Test Setup and Results www.ti.com VO = 20 mV / div (ac coupled) SWA = 5 V / div SWB = 5 V / div Time = 200 nsec / div Figure 2-9. TPS54A20EVM-770 Output Ripple, 10 A Load 2.8 Input Voltage Ripple Figure 2-10, Figure 2-11 and Figure 2-12 show the TPS54A20EVM-770 input voltage ripple. The load currents are 0 A, 5 A and 10 A. VIN = 12 V. The ripple voltage is measured directly across TP1 and TP2. VI = 50 mV / div (ac coupled) SWA = 5 V / div SWB = 5 V / div Time = 200 nsec / div Figure 2-10. TPS54A20EVM-770 Input Ripple, 0 A Load 10 TPS54A20 SWIFT™ Step-Down Converter Evaluation Module User's Guide SLVUAM8B – DECEMBER 2015 – REVISED AUGUST 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Test Setup and Results VI = 50 mV / div (ac coupled) SWA = 5 V / div SWB = 5 V / div Time = 200 nsec / div Figure 2-11. TPS54A20EVM-770 Input Ripple, 5 A Load VI = 50 mV / div (ac coupled) SWA = 5 V / div SWB = 5 V / div Time = 200 nsec / div Figure 2-12. TPS54A20EVM-770 Input Ripple, 10 A Load SLVUAM8B – DECEMBER 2015 – REVISED AUGUST 2021 TPS54A20 SWIFT™ Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 11 Test Setup and Results www.ti.com 2.9 Powering Up Figure 2-13 and Figure 2-14 show the start-up waveforms for the TPS54A20EVM-770. In Figure 2-13, the output voltage ramps up as soon as the input voltage reaches the UVLO threshold as set by the R2 and R3 resistor divider network. In Figure 2-14, the input voltage is initially 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, the start-up sequence begins and the output voltage ramps up to the externally set value of 1.2 V. The input voltage for these plots is 12 V and the load is 1 Ω. VIN = 10=0 V / div EN = 1 V / div VO = 500 mV / div Time = 2 msec / div Figure 2-13. TPS54A20EVM-770 Start-Up Relative to VIN VIN = 10=0 V / div EN = 1 V / div VO = 500 mV / div Time = 2 msec / div Figure 2-14. TPS54A20EVM-770 Start-Up Relative to Enable 12 TPS54A20 SWIFT™ Step-Down Converter Evaluation Module User's Guide SLVUAM8B – DECEMBER 2015 – REVISED AUGUST 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Test Setup and Results 2.10 Thermal Image The EVM thermal image is shown in Figure 2-15. The input voltage is 12 V and the output current is 10A. The EVM was allowed to operate at full 10 A load for > 45 minutes before the image was captured. Maximum Case Temperature = 76.3 °C Figure 2-15. Thermal Image SLVUAM8B – DECEMBER 2015 – REVISED AUGUST 2021 TPS54A20 SWIFT™ Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 13 Board Layout www.ti.com 3 Board Layout This section provides a description of the TPS54A20EVM-770 board layout and layer illustrations. 3.1 Layout The board layout for the TPS54A20EVM-770 is shown in Figure 3-1 through Figure 3-5. The top-side layer of the EVM is laid out in a manner typical of a user application. The top, bottom, and internal layers are 2-oz. copper. The top layer contains the main power traces for VIN, VOUT, SWA and SWB. Also on the top layer are connections for the remaining pins of the TPS54A20 and a large area filled with ground. The internal layer-1 is dedicated ground plane. The internal layer-2 contain an additional large ground copper area as well as an additional VOUT copper fill. The bottom layer is another ground plane with an additional trace for the output voltage feedback. The top-side ground traces are connected to the bottom and internal ground planes with multiple vias placed around the board including five vias directly under the TPS54A20 device to provide a thermal path from the top-side ground plane to the bottom-side ground plane. The input decoupling capacitors and bootstrap capacitor are all located as close to the IC as possible. Additionally, the voltage setpoint resistor divider components are kept close to the IC. The voltage divider network ties to the output voltage at the point of regulation, the copper VOUT trace at the TP7 test point. For the TPS54A20, an additional input bulk capacitor may be required, depending on the EVM connection to the input supply. Critical analog circuits such as the voltage set point divider, frequency set resistor, and compensation components are terminated to ground using a wide ground trace separate from the power ground pour. 14 Figure 3-1. TPS54A20EVM-770 Top-Side Assembly Figure 3-2. TPS54A20EVM-770 Top-Side Layout Figure 3-3. TPS54A20EVM-770 Internal Layer-1 Layout Figure 3-4. TPS54A20EVM-770 Internal Layer-2 Layout TPS54A20 SWIFT™ Step-Down Converter Evaluation Module User's Guide SLVUAM8B – DECEMBER 2015 – REVISED AUGUST 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Schematic and Bill of Materials Figure 3-5. TPS54A20EVM-770 Bottom-Side Layout 4 Schematic and Bill of Materials This section presents the TPS54A20EVM-770 schematic and bill of materials. SLVUAM8B – DECEMBER 2015 – REVISED AUGUST 2021 TPS54A20 SWIFT™ Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 15 Schematic and Bill of Materials www.ti.com 4.1 Schematic Figure 4-1 is the schematic for the TPS54A20EVM-770. TP1 J1 2 1 Vin = 9.2 V - 14 V DNPC22 47uF 25V DNPC23 47uF 25V C24 22uF 35V C1 10uF 25V C2 TP2 10uF 25V U1 VIN PGND 3 TP3 R2 80.6k VG+ R6 TP4PGOOD 15 47.5k SYNC 14 SSFSEL 6 EN 4 J2 2 1 TP5 J3 R3 R4 22.1k 12.4k DNP C3 1uF 16V 5 VGA 7 TON 19 VG+ 16 2 1 R1 DNP 47.0k ILIM R5 22.1k C4 1uF 10V 17 VIN BOOTA PGOOD SYNC SS/FSEL EN SCAP SCAP NC SWA 8 BTA 9 20 C5 0.047uF 10V SCAP C6 2.2uF 16V SWA 11 13 L1 220nH ILIM TP7 VGA BOOTB TON C7 0.047uF 10V SWB VG+ SWB VG- FB 12 18 TP8 L2 220nH R9 FB 1 AGND PGND AGND PGND C10 47uF 10V DNPC11 DNPC12 100uF 100uF 6.3V 6.3V PGND 0 2 TP6 C8 R8 TPS54A20RNJR 3.32k PGND AGND C9 47uF 10V 1 2 R10 20.0k PGND J4 Vout = 1.2 V, 10 A 10 BTB TP13 R7 14.3k 22pF 50V 5,6, 7,8 TP9 Q1 4 1,2,3 AGND TP10 R11 51.1 TP11 R12 0.02 R13 0.02 TP12 PGND Figure 4-1. TPS54A20EVM-770 Schematic 4.2 Bill of Materials Table 4-1 presents the bill of materials for the TPS54A20EVM-770. Table 4-1. TPS54A20EVM-770 Bill of Materials Designator Quantity PCB 1 C1, C2 2 10uF CAP, CERM, 10 uF, 25 V, +/- 20%, X5R, 0603 C3 1 1uF C4 1 1uF C5, C7 2 C6 1 16 Value Description Package Part Number Manufacturer PWR770 Any 0603 C1608X5R1E106M080AC TDK CAP, CERM, 1 uF, 16 V, +/- 10%, X7R, 0603 0603 C1608X7R1C105K080AC TDK CAP, CERM, 1 uF, 10 V, +/- 10%, X5R, 0402 0402 GRM155R61A105KE15D MuRata 0.047uF CAP, CERM, 0.047 uF, 10 V, +/- 10%, X5R, 0402 0402 C1005X5R1A473K050BA TDK 2.2uF CAP, CERM, 2.2 uF, 16 V, +/- 10%, X7R, 1206 1206 GRM31MR71C225KA35L MuRata Printed Circuit Board TPS54A20 SWIFT™ Step-Down Converter Evaluation Module User's Guide Copyright © 2021 Texas Instruments Incorporated SLVUAM8B – DECEMBER 2015 – REVISED AUGUST 2021 Submit Document Feedback www.ti.com Schematic and Bill of Materials Table 4-1. TPS54A20EVM-770 Bill of Materials (continued) Designator Quantity Value Description Package Part Number Manufacturer C8 1 22pF CAP, CERM, 22 pF, 50 V, +/- 5%, C0G/NP0, 0603 0603 06035A220JAT2A AVX C9, C10 2 47uF CAP, CERM, 47 uF, 10 V, +/- 20%, X5R, 0805 0805 GRM21BR61A476ME15 MuRata C24 1 22uF CAP, CERM, 22 uF, 35 V, +/- 20%, X5R, 0805 0805 C2012X5R1V226M125AC TDK J1, J4 2 Terminal Block, 5.08 mm, 2x1, Brass, TH 2x1 5.08 mm Terminal Block ED120/2DS On-Shore Technology J2, J3 2 Header, 100mil, 2x1, Gold, TH Header, 100mil, 2x1, TH HTSW-102-07-G-S Samtec L1, L2 2 220nH Inductor, 220 nH, 7.2 A, 0.0075 ohm, SMD 3.2x2.5mm MLA-FY12NR22N-M3-RU Mag Layers Q1 1 30V MOSFET, N-CH, 30 V, 65 A, DQJ0008A (VSONP-8) DQJ0008A CSD17527Q5A Texas Instruments R2 1 80.6k RES, 80.6 k, 1%, 0.1 W, 0603 0603 CRCW060380K6FKEA Vishay-Dale R3 1 12.4k RES, 12.4 k, 1%, 0.1 W, 0603 0603 CRCW060312K4FKEA Vishay-Dale R5 1 22.1k RES, 22.1 k, 1%, 0.1 W, 0603 0603 RC0603FR-0722K1L Yageo America R6 1 47.5k RES, 47.5 k, 1%, 0.1 W, 0603 0603 RC0603FR-0747K5L Yageo America R7 1 14.3k RES, 14.3 k, 1%, 0.1 W, 0603 0603 CRCW060314K3FKEA Vishay-Dale R8 1 3.32k RES, 3.32 k, 1%, 0.1 W, 0603 0603 CRCW06033K32FKEA Vishay-Dale R9 1 20.0k RES, 20.0 k, 1%, 0.1 W, 0603 0603 CRCW060320K0FKEA Vishay-Dale R10 1 0 RES, 0, 5%, 0.1 W, 0603 0603 ERJ-3GEY0R00V Panasonic R11 1 51.1 RES, 51.1, 0.1%, 0.1 W, 0603 0603 RT0603BRD0751R1L Yageo America R12, R13 2 0.02 RES, 0.02, 1%, 3 W, 2512 2512 CRA2512-FZ-R020ELF Bourns SH-J1 1 1x2 Shunt, 100mil, Gold plated, Black Shunt SNT-100-BK-G Samtec TP1, TP7, TP11 3 Test Point, Multipurpose, Red, TH Red Multipurpose Testpoint 5010 Keystone TP2, TP8, TP10, TP12, TP13 5 Test Point, Multipurpose, Black, TH Black Multipurpose Testpoint 5011 Keystone TP3 1 Test Point, Multipurpose, Blue, TH Blue Multipurpose Testpoint 5127 Keystone TP4 1 Test Point, Multipurpose, Orange, TH Orange Multipurpose Testpoint 5013 Keystone TP5 1 Test Point, Multipurpose, Yellow, TH Yellow Multipurpose Testpoint 5014 Keystone TP6 1 Test Point, Multipurpose, Brown, TH Brown Multipurpose Testpoint 5125 Keystone TP9 1 Test Point, Multipurpose, White, TH White Multipurpose Testpoint 5012 Keystone U1 1 Small, 10MHz 10A, 8V to 14V Input, SWIFT Series Capacitor RNJ0020A Step-Down Converter, RNJ0020A (VQFN-HR-20) TPS54A20RNJR Texas Instruments C11, C12 0 100uF CAP, CERM, 100 uF, 6.3 V, +/- 20%, X5R, 1206 1206 JMK316BJ107ML-T Taiyo Yuden C22, C23 0 47uF CAP, CERM, 47 uF, 25 V, +/- 20%, X5R, 1206_190 1206_190 C3216X5R1E476M160AC TDK R1 0 47.0k RES, 47.0 k, 1%, 0.1 W, 0603 0603 RC0603FR-0747KL Yageo America R4 0 22.1k RES, 22.1 k, 1%, 0.1 W, 0603 0603 RC0603FR-0722K1L Yageo America SLVUAM8B – DECEMBER 2015 – REVISED AUGUST 2021 Submit Document Feedback TPS54A20 SWIFT™ Step-Down Converter Evaluation Module User's Guide Copyright © 2021 Texas Instruments Incorporated 17 Revision History www.ti.com 5 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision A (March 2019) to Revision B (August 2021) Page • Updated user's guide title................................................................................................................................... 2 • Updated the numbering format for tables, figures, and cross-references throughout the document. ................2 Changes from Revision * (December 2015) to Revision A (March 2019) Page • Changed 1 kΩ to 14.3 kΩ................................................................................................................................... 3 • Updated Figure 2-6 ............................................................................................................................................8 • Updated Figure 3-1 through Figure 3-5............................................................................................................ 14 • Updated Figure 4-1...........................................................................................................................................15 • Updated Table 4-1............................................................................................................................................ 16 18 TPS54A20 SWIFT™ Step-Down Converter Evaluation Module User's Guide SLVUAM8B – DECEMBER 2015 – REVISED AUGUST 2021 Submit Document Feedback Copyright © 2021 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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