TPS548B27EVM-162

www.ti.com Table of Contents User’s Guide TPS548B27EVM-162 20-A, Buck Converter Evaluation Module User Guide ABSTRACT This user’s guide contains information for the TPS548B27EVM-162 evaluation module (EVM) as well as for the TPS548B27 DC/DC converter. Also included are the performance specifications, the schematic, and the list of materials for the TPS548B27EVM. Table of Contents 1 Introduction.............................................................................................................................................................................2 2 Safety Warnings......................................................................................................................................................................2 3 Background.............................................................................................................................................................................2 4 Performance Specification Summary................................................................................................................................... 3 5 Modifications...........................................................................................................................................................................3 5.1 Output Voltage Setpoint..................................................................................................................................................... 3 5.2 Frequency and Operation Mode Setting............................................................................................................................ 4 5.3 Enable Pin Selection.......................................................................................................................................................... 4 5.4 Remote Sensing.................................................................................................................................................................4 5.5 Adjustable UVLO................................................................................................................................................................4 6 Schematic................................................................................................................................................................................5 7 List of Materials.......................................................................................................................................................................6 8 Layout...................................................................................................................................................................................... 8 List of Figures Figure 2-1. Hot Surface. Contact may cause burns. Do not touch.............................................................................................. 2 Figure 6-1. TPS548B27EVM Schematic..................................................................................................................................... 5 Figure 8-1. TPS548B27EVM Top-Side Composite View............................................................................................................. 8 Figure 8-2. TPS548B27EVM Bottom-Side Composite View........................................................................................................8 Figure 8-3. TPS548B27EVM Top-Side Layout............................................................................................................................ 9 Figure 8-4. TPS548B27EVM Internal Layer-1 Layout................................................................................................................. 9 Figure 8-5. TPS548B28EVM Internal Layer-2 Layout................................................................................................................. 9 Figure 8-6. TPS548B27EVM Bottom-Side Layout.......................................................................................................................9 List of Tables Table 3-1. Input Voltage and Output Current Summary...............................................................................................................2 Table 4-1. Performance Specification Summary..........................................................................................................................3 Table 5-1. TPS548B27EVM Mode Pin Selection.........................................................................................................................4 Table 5-2. Enable Pin Selection...................................................................................................................................................4 Table 7-1. TPS548B27EVM List of Materials...............................................................................................................................6 Trademarks D-CAP3™ is a trademark of TI. All trademarks are the property of their respective owners. SNVU759 – JULY 2021 Submit Document Feedback TPS548B27EVM-162 20-A, Buck Converter Evaluation Module User Guide Copyright © 2021 Texas Instruments Incorporated 1 Introduction www.ti.com 1 Introduction The TPS548B27 is a D-CAP3™ synchronous buck converter designed for 20-A output current, and the evaluation module is designed to demonstrate the small printed-circuit-board areas that may be achieved when designing with the device. The high-side and low-side switching MOSFETs are integrated in the device package along with their gate drive circuitry. Rated input voltage and output current ranges for the evaluation module are given in Table 3-1. 2 Safety Warnings Figure 2-1. Hot Surface. Contact may cause burns. Do not touch. 3 Background The EVM is setup to allow the user to evaluate the performance of the TPS548B27 IC, and easily make changes to multiple settings. The low drain-to-source on resistance of the MOSFETs allows the device to achieve high efficiencies and keep the junction temperature low at high output currents. There is no need for external compensation components since this device is designed with D-CAP3™ control topology. On the EVM, the switching frequency and the operation mode are externally selectable using a jumper to set the resistor from the MODE pin to AGND. An external resistor divider allows for an adjustable output voltage. Additionally, the device provides adjustable soft start, adjustable OC limit threshold, external reference input, and an open-drain power good indicator. Lastly the TPS548B27 device has a fixed internal VIN under voltage lockout and externally adjustable UVLO using a resistor divider at the EN pin. Table 3-1. Input Voltage and Output Current Summary 2 EVM Input Voltage Range Output Current Range TPS548B27 VIN = 4 V to 16 V 0 A to 20 A TPS548B27EVM-162 20-A, Buck Converter Evaluation Module User Guide Copyright © 2021 Texas Instruments Incorporated SNVU759 – JULY 2021 Submit Document Feedback www.ti.com Performance Specification Summary 4 Performance Specification Summary A summary of the TPS548B27EVM performance specifications is provided in Table 4-1. Specifications are given for an input voltage of VIN = 12 V and an output voltage of 1.0 V, unless otherwise specified. The TPS548B27EVM is designed and tested for VIN = 8 V to 14 V. The ambient temperature is 25°C for all measurements, unless otherwise noted. The design can be modified to perform over 4 V to 16 V. Table 4-1. Performance Specification Summary Specification Test Conditions VIN voltage range (without internal Bias) MIN TYP MAX Unit 8 12 14 V Output voltage setpoint Output current range 1.0 VIN = 8 V to 14 V 0 20 V 20 A Internal LDO Voltage 3.0 V Operating frequency 800 kHz 5 Modifications These evaluation modules are designed to provide access to the features of the TPS548B27. Some modifications can be made to this module. 5.1 Output Voltage Setpoint To change the output voltage of the EVM, it is necessary to change the value of resistor R8 and R9. R13 is fixed at 10 kΩ. Changing the total value of R8 plus R9 can change the output voltage above the 0.6-V reference voltage VINTREF. A two resistor configuration of R8 + R9 is implemented to give the exact desired output voltage setting. The value of R8 and R9 for a specific output voltage can be calculated using Equation 1. RFB _ HS VO VINTREF u RFB _ LS VINTREF (1) where • • • VINTREF = 0.6 V RFB_HS = R8+ R9 RFB_LS = R13 = 10 kΩ SNVU759 – JULY 2021 Submit Document Feedback TPS548B27EVM-162 20-A, Buck Converter Evaluation Module User Guide Copyright © 2021 Texas Instruments Incorporated 3 Modifications www.ti.com 5.2 Frequency and Operation Mode Setting To change the frequency and operation mode of the part, the MODE pin is used. J4 and the surrounding circuitry allows for an easy change to the frequency and operation mode setting. Table 5-1 shows all 6 options offered by J4. Table 5-1. TPS548B27EVM Mode Pin Selection Mode Pin Connections Switching Frequency (FSW) Operation Mode Under Light Load Connection Jumper Setting 600 kHz Skip Mode Short to VCC Short Pins 1 and 2 800 kHz Skip Mode 243 kΩ ±10% to AGND Short Pins 3 and 4 1000 kHz Skip Mode 121 kΩ ±10% to AGND Short Pins 5 and 6 1000 kHz Forced CCM 60.4 kΩ ±10% to AGND Short Pins 7 and 8 800 kHz Forced CCM 30.1 kΩ ±10% to AGND Short Pins 9 and 10 600 kHz Forced CCM Short to AGND Short Pins 11 and 12 5.3 Enable Pin Selection The converter can be enabled and disabled by J3. Default setting: EN pin connected to VIN. Table 5-2. Enable Pin Selection Set On Connection Enable Selection Pins 2-3 Shorted EN pin connected to VIN pins through resistor divider J3 Open EN pin is left floating Pins 1-2 Shorted EN pin connected to PGND 5.4 Remote Sensing The EVM is not set-up for remote sensing by default. To set up remote sensing follow these steps: 1. Replace R10 and R14 with 100-Ω resistors 2. Connect your sense points to the Vsns+ and Vsns- test points 5.5 Adjustable UVLO The undervoltage lockout (UVLO) can be adjusted externally using R2 and R9. See the TPS548B27 4-V to 16-V Input, 15-A/20-A Synchronous Step-Down Converter Data Sheet for detailed instructions for setting the external UVLO. 4 TPS548B27EVM-162 20-A, Buck Converter Evaluation Module User Guide Copyright © 2021 Texas Instruments Incorporated SNVU759 – JULY 2021 Submit Document Feedback www.ti.com Schematic 6 Schematic Figure 6-1 illustrates the TPS548B27EVM schematic. TP1 TP2 R1 0 R2 VIN: 4 to 16V J2 C2 22uF 22uF C3 1uF C4 1uF PGND 0 J1 L_Filt L1 PGND PGND VIN 1 2 Vin C1 47nH C5 10µF Vout C6 TP4 330uF PGND 1.0 Vout and 20A Iout max C7 22uF C8 22uF C9 22uF C11 1uF C10 22uF C12 1uF PGND 9 18 TP7 VCC EN 7 BOOT R5 20.0k EN FB TP8 VCC: 3.3 to 3.6V Short 2-3: Pull to VIN VIN VIN SW PGND C24 2.2uF 16 R6 TP9 3 2 1 PGOOD 8 Mode 3 TRIP 2 VSNSPGOOD SS/REFIN PGND EN Short 2-1: Disable R11 10.0k C28 0.01uF C14 0.1uF 100uF 100uF C15 470uF TP5 R3 BOOT 19 SW 17 0 C17 L2 300nH XAL7070-301MEB FB 6 MODE AGND PGND PGND PGND PGND PGND PGND TRIP R12 5.23k 0.1uF R4 2.2 TP10 SS 4 C19 C23 1000pF VSNS- 5 PGND 0.1uF VCC 10.0k J3 C16 C13 TP6 U1 Open: Float EN 1 2 VOUT TP3 C25 AGND C26 C27 R8 R9 6.65k 0 TP14 0.022uF C22 100uF 100uF C18 470uF PGND R7 2200pF PGND 10 11 12 13 14 15 C21 100uF 0 TP11 1 C20 TP12 Bode-/ VSNS+ TP13 R10 Bode+ 10.0 R8 for Bode Plot tes
ng purposes only 0.22uF R13 10.0k TPS548B27RYLT AGND PGND AGND TP15 AGND VSNS- R14 NT1 0 PGND AGND PGND J4 Mode 1 3 5 7 9 11 VCC 2 4 6 8 10 12 TSW-106-07-G-D R15 R16 R17 R18 30.1k 60.4k 121k 243k AGND Figure 6-1. TPS548B27EVM Schematic SNVU759 – JULY 2021 Submit Document Feedback TPS548B27EVM-162 20-A, Buck Converter Evaluation Module User Guide Copyright © 2021 Texas Instruments Incorporated 5 List of Materials www.ti.com 7 List of Materials Table 7-1 presents the list of materials for the TPS548B27EVM. Table 7-1. TPS548B27EVM List of Materials 6 Designator QTY Description Part Number Manufacturer C1, C2, C9, C10 4 CAP, CERM, 22 uF, 25 V, +/- 20%, X6S, 1206_190 GRM31CC81E226ME11L Murata C3, C11, C12 3 CAP CER 1UF 25V X6S 0402 GRM155C81E105KE11D Murata C6 1 CAP, AL, 330 uF, 25 V, +/- 20%, 0.15 ohm, SMD EEE-FC1E331P Panasonic C13, C14, C20, C21 4 CAP, CERM, 100 uF, 4 V, +/- 20%, X6S, 1206_190 C3216X6S0G107M160AC TDK C16, C19 2 CAP, CERM, 0.1 uF, 6.3 V, +/- 10%, X7R, 0402 GRM155R70J104KA01D MuRata C17 1 CAP, CERM, 0.1 uF, 50 V, +/- 10%, X7R, AEC-Q200 Grade 1, 0402 CGA2B3X7R1H104K050BB TDK C24 1 CAP, CERM, 2.2 uF, 10 V, +/- 20%, X5R, 0402 GRM155R61A225ME95 Murata C25 1 CAP, CERM, 2200 pF, 16 V, +/- 10%, X7R, 0402 GRM155R71C222KA01D Murata C26 1 CAP, CERM, 0.022 uF, 16 V, +/- 10%, X7R, 0402 GRM155R71C223KA01D Murata C27 1 CAP, CERM, 0.22 uF, 10 V, +/- 10%, X7R, 0402 GRM155R71A224KE01D Murata C28 1 CAP, CERM, 0.01 uF, 16 V, +/- 10%, X5R, 0402 GRM155R61C103KA01D Murata H1, H2, H3, H4 4 Bumpon, Hemisphere, 0.44 X 0.20, Clear SJ-5303 (CLEAR) 3M J1, J2 2 Therminal Block, 5 mm, 2-pole, Tin, TH 282856-2 TE Connectivity J3 1 Header, 100mil, 3x1, Gold, TH HTSW-103-07-G-S Samtec J4 1 Header, 100mil, 6x2, Gold, TH TSW-106-07-G-D Samtec L2 1 Inductor, Shielded, Composite, 300 nH, 33.4 A, 0.00106 ohm, SMD XAL7070-301MEB Coilcraft LBL1 1 Thermal Transfer Printable Labels, 0.650" W x 0.200" H 10,000 per roll THT-14-423-10 Brady R1, R2 2 RES, 0, 1%, 0.5 W, 1206 5108 Keystone R3, R7, R9, R14 4 RES, 0, 5%, 0.1 W, AEC-Q200 Grade 0, 0402 ERJ-2GE0R00X Panasonic R5 1 RES, 20.0 k, 0.1%, 0.1 W, 0603 RT0603BRD0720KL Yageo America R6, R13 2 RES, 10.0 k, 1%, 0.1 W, 0402 ERJ-2RKF1002X Panasonic R8 1 RES, 6.65 k, 1%, 0.063 W, AEC-Q200 Grade 0, 0402 CRCW04026K65FKED Vishay-Dale R10 1 RES, 10.0, 1%, 0.063 W, 0402 CRCW040210R0FKED Vishay-Dale R11 1 RES, 10.0 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 CRCW060310K0FKEA Vishay-Dale R12 1 RES, 5.23 k, 1%, 0.063 W, AEC-Q200 Grade 0, 0402 CRCW04025K23FKED Vishay-Dale R15 1 RES, 30.1 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 CRCW060330K1FKEA Vishay-Dale R16 1 RES, 60.4 k, 1%, 0.1 W, 0603 RC0603FR-0760K4L Yageo R17 1 RES, 121 k, 1%, 0.1 W, 0603 RC0603FR-07121KL Yageo R18 1 RES, 243 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 CRCW0603243KFKEA Vishay-Dale SH-J1, SH-J2 2 Shunt, 100mil, Gold plated, Black SNT-100-BK-G Samtec TP1, TP2, TP4, TP11, TP14 5 Test Point, Multipurpose, Black, TH 5011 Keystone TP3, TP5, TP8 3 Test Point, Multipurpose, Red, TH 5010 Keystone TP6 1 Test Point, Compact, Orange, TH 5008 Keystone TP7, TP9, TP10 3 Test Point, Compact, Yellow, TH 5009 Keystone TP12, TP13, TP15 3 Test Point, Multipurpose, Orange, TH 5013 Keystone U1 1 2.7V - 16V, 20A Synchronous Step-Down Converter With Differential Remote Sense TPS548B27RYLT Texas Instruments C4 0 CAP CER 1UF 25V X6S 0402 GRM155C81E105KE11D Murata C5 0 CAP, CERM, 10 uF, 25 V, +/- 10%, X7R, 0805 GRM21BZ71E106KE15L Murata C7, C8 0 CAP, CERM, 22 uF, 25 V, +/- 20%, X6S, 1206_190 GRM31CC81E226ME11L Murata C15, C18 0 CAP, Tantalum Polymer, 470 uF, 6.3 V, +/- 20%, 0.01 ohm, 6TPF470MAH 7343-40 SMD Panasonic C22 0 CAP, CERM, 100 uF, 4 V, +/- 20%, X6S, 1206_190 C3216X6S0G107M160AC TDK C23 0 CAP, CERM, 1000 pF, 50 V, +/- 5%, X7R, 0603 CL10C102JB8NNNC Samsung ElectroMechanics 'FID1, FID2, FID3, FID4, FID5, FID6 0 Fiducial mark. There is nothing to buy or mount. N/A N/A TPS548B27EVM-162 20-A, Buck Converter Evaluation Module User Guide Copyright © 2021 Texas Instruments Incorporated SNVU759 – JULY 2021 Submit Document Feedback www.ti.com List of Materials Table 7-1. TPS548B27EVM List of Materials (continued) Designator QTY Description Part Number Manufacturer L1 0 Inductor, Wirewound, Ceramic, 47 nH, 0.5 A, 0.31 ohm, SMD 0805CS-470XJLB Coilcraft R4 0 RES, 2.2, 5%, 0.5 W, 1206 CRM1206-JW-2R2ELF Bourns SNVU759 – JULY 2021 Submit Document Feedback TPS548B27EVM-162 20-A, Buck Converter Evaluation Module User Guide Copyright © 2021 Texas Instruments Incorporated 7 Layout www.ti.com 8 Layout The board layout for the TPS548B27EVM is shown in Figure 8-3 through Figure 8-6. 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, and SW. Also on the top layer are connections for the remaining pins of the TPS548B27 and the majority of the signal traces. The top layer has a dedicated ground plane for quiet analog ground that is connected to the main power ground plane at a single point. The internal layer-1 is a large ground plane. The internal layer-2 contains an additional large ground copper area as well as an additional VOUT copper fill. The bottom layer is another ground plane with two additional traces for the output voltage feedback and various signals routed to test points and headers. There are also additional VIN and VOUT planes on the bottom layer. The top-side ground traces are connected to the bottom and internal ground planes with multiple via groupings placed around the board. The input decoupling capacitors and bootstrap capacitor are all located as close to the IC as possible. Additionally, the voltage set point 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 TP4 test point. An additional input bulk capacitor is used to limit the noise entering the converter from the input supply. Critical analog circuits that are noise sensitive are terminated to the quiet analog ground island on the top layer. Figure 8-1. TPS548B27EVM Top-Side Composite View 8 Figure 8-2. TPS548B27EVM Bottom-Side Composite View TPS548B27EVM-162 20-A, Buck Converter Evaluation Module User Guide Copyright © 2021 Texas Instruments Incorporated SNVU759 – JULY 2021 Submit Document Feedback www.ti.com Layout Figure 8-3. TPS548B27EVM Top-Side Layout Figure 8-4. TPS548B27EVM Internal Layer-1 Layout Figure 8-5. TPS548B28EVM Internal Layer-2 Layout Figure 8-6. 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