TPS54239EVM-056

www.ti.com Table of Contents User’s Guide TPS54239 Step-Down Converter Evaluation Module User's Guide ABSTRACT This user's guide contains information for the TPS54239EVM-056 evaluation module as well as for the TPS54239. Included are the performance specifications, schematic, and the bill of materials of the TPS54239EVM-056. Table of Contents 1 Introduction.............................................................................................................................................................................3 2 Performance Specification Summary................................................................................................................................... 4 3 Modifications...........................................................................................................................................................................5 3.1 Output Voltage Setpoint..................................................................................................................................................... 5 3.2 Output Filter and Closed-Loop Response..........................................................................................................................5 4 Test Setup and Results.......................................................................................................................................................... 6 4.1 Input/Output Connections.................................................................................................................................................. 6 4.2 Start-Up Procedure............................................................................................................................................................ 6 4.3 Efficiency............................................................................................................................................................................7 4.4 Load Regulation................................................................................................................................................................. 8 4.5 Line Regulation.................................................................................................................................................................. 8 4.6 Load Transient Response.................................................................................................................................................. 9 4.7 Output Voltage Ripple........................................................................................................................................................ 9 4.8 Input Voltage Ripple......................................................................................................................................................... 10 4.9 Start-Up............................................................................................................................................................................ 11 4.10 Shut-Down..................................................................................................................................................................... 12 5 Board Layout.........................................................................................................................................................................13 5.1 Layout.............................................................................................................................................................................. 13 6 Schematic, Bill of Materials, and Reference...................................................................................................................... 16 6.1 Schematic........................................................................................................................................................................ 16 6.2 Bill of Materials.................................................................................................................................................................17 6.3 Reference.........................................................................................................................................................................17 7 Revision History................................................................................................................................................................... 17 List of Figures Figure 4-1. TPS54239EVM-056 Efficiency.................................................................................................................................. 7 Figure 4-2. TPS54239EVM-056 Light-Load Efficiency................................................................................................................ 7 Figure 4-3. TPS54239EVM-056 Load Regulation, VIN = 5 V and VIN = 12 V.............................................................................. 8 Figure 4-4. TPS54239EVM-056 Line Regulation........................................................................................................................ 8 Figure 4-5. TPS54239EVM-056 Load Transient Response........................................................................................................ 9 Figure 4-6. TPS54239EVM-056 Output Voltage Ripple (IOUT = 2 A)...........................................................................................9 Figure 4-7. TPS54239EVM-056 Output Voltage Ripple (IOUT = 0 A).........................................................................................10 Figure 4-8. TPS54239EVM-056 Input Voltage Ripple............................................................................................................... 10 Figure 4-9. TPS54239EVM-056 Start-Up Relative to VIN with SS............................................................................................. 11 Figure 4-10. TPS54239EVM-056 Start-Up Relative to EN with SS........................................................................................... 11 Figure 4-11. TPS54239EVM-056 Shut-Down Relative to VIN with SS.......................................................................................12 Figure 4-12. TPS54239EVM-056 Shut-Down Relative to EN with SS...................................................................................... 12 Figure 5-1. Top Assembly.......................................................................................................................................................... 13 Figure 5-2. Top Layer.................................................................................................................................................................14 Figure 5-3. Internal Layer 1....................................................................................................................................................... 14 Figure 5-4. Internal Layer 2....................................................................................................................................................... 15 Figure 5-5. Bottom Layer........................................................................................................................................................... 15 SLVU835A – JANUARY 2013 – REVISED OCTOBER 2021 TPS54239 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 1 Trademarks www.ti.com Figure 6-1. TPS54239EVM-056 Schematic Diagram................................................................................................................ 16 List of Tables Table 1-1. Input Voltage and Output Current Summary...............................................................................................................3 Table 2-1. TPS54239EVM-056 Performance Specifications Summary.......................................................................................4 Table 3-1. Output Voltages.......................................................................................................................................................... 5 Table 4-1. Connection and Test Points........................................................................................................................................ 6 Table 6-1. Bill of Materials..........................................................................................................................................................17 Trademarks D-CAP2™ is a trademark of Texas Instruments. All trademarks are the property of their respective owners. 2 TPS54239 Step-Down Converter Evaluation Module User's Guide SLVU835A – JANUARY 2013 – REVISED OCTOBER 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Introduction 1 Introduction The TPS54239 is a single, adaptive on-time, D-CAP2™-mode, synchronous buck converter requiring a low external component count. The D-CAP2™ control circuit is optimized for low-ESR output capacitors such as POSCAP, SP-CAP, or ceramic types and features fast transient response with no external compensation. The switching frequency is internally set at a nominal 600 kHz. The high-side and low-side switching MOSFETs are incorporated inside the TPS54239 package along with the gate-drive circuitry. The low drain-to-source on-resistance of the MOSFETs allows the TPS54239 to achieve high efficiencies and helps keep the junction temperature low at high-output currents. The TPS54239 dc/dc synchronous converter is designed to provide up to a 2-A output from an input voltage source of 4.5 V to 23 V. The output voltage range is from 0.76 V to 7 V. Rated input voltage and output current range for the evaluation module are given in Table 1-1. The TPS54239EVM-056 evaluation module circuit is a single, synchronous buck converter providing 1.05 V at 2 A from 4.5-V to 23-V input. This user’s guide describes the TPS54239EVM-056 performance. Table 1-1. Input Voltage and Output Current Summary EVM Input Voltage Range Output Current Range TPS54239EVM-056 VIN = 4.5 V to 23 V 0 A to 2 A SLVU835A – JANUARY 2013 – REVISED OCTOBER 2021 TPS54239 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 3 Performance Specification Summary www.ti.com 2 Performance Specification Summary A summary of the TPS54239EVM-056 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. TPS54239EVM-056 Performance Specifications Summary Specifications Test Conditions Input voltage range (VIN) Min Typ Max 4.5 12 23 Output voltage Operating frequency VIN = 12 V, IO = 1.5 A Output current range 4 V 600 kHz 0 2 IO = 1 A Load regulation VIN = 12 V Overcurrent limit VIN = 12 V, LO = 2.2 µH Output ripple voltage VIN = 12 V, IO = 2 A 10 Maximum efficiency VIN = 5 V, IO= 0.5 A 87.7 TPS54239 Step-Down Converter Evaluation Module User's Guide V 1.05 Line regulation +0.5/- 0.3 3.1 A % +/- 0.02 2.5 Unit % 4.6 A mVPP % SLVU835A – JANUARY 2013 – REVISED OCTOBER 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Modifications 3 Modifications These evaluation modules are designed to provide access to the features of the TPS54239. Some modifications 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. For output voltage from 0.76 V to 7 V: æ R1 ö VO = 0.765 ´ ç 1+ ÷ è R2 ø (1) Table 3-1 lists the R1 values for some common output voltages. For higher output voltages of 1.8 V or above, a feedforward capacitor (C4) may be required to improve phase margin. Pads for this component (C4) are provided on the printed-circuit board (PCB). Note that the resistor values given in Table 3-1 are standard values and not the exact value calculated using Equation 1. Table 3-1. Output Voltages Output Voltage (V) (1) C4 (pF)(1) R1 (kΩ) R2 (kΩ) L1 (µH) C8 + C9 + C10 (µF) Min Typ Max Min Typ Max Min Max 1 6.81 22.1 5 150 220 1.5 2.2 4.7 22 68 1.05 8.25 22.1 5 150 220 1.5 2.2 4.7 22 68 1.2 12.7 22.1 5 100 1.5 2.2 4.7 22 68 1.5 21.5 22.1 5 68 1.5 2.2 4.7 22 68 1.8 30.1 22.1 5 22 2.2 3.3 4.7 22 68 2.5 49.9 22.1 5 22 2.2 3.3 4.7 22 68 3.3 73.2 22.1 5 22 2.2 3.3 4.7 22 68 5 124 22.1 5 22 3.3 4.7 22 68 6.5 165 22.1 5 22 3.3 4.7 22 68 Optional 3.2 Output Filter and Closed-Loop Response The TPS54239 relies on the output filter characteristics to ensure stability of the control loop. The recommended output filter components for common output voltages are given in Table 3-1. It may be possible for other output filter component values to provide acceptable closed-loop characteristics. R3 and TP4 are provided for convenience in breaking the control loop and measuring the closed-loop response. SLVU835A – JANUARY 2013 – REVISED OCTOBER 2021 TPS54239 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback 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 TPS54239EVM-056. 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 TPS54239EVM-056 is provided with input and output connectors and test points as shown in Table 4-1. A power supply capable of supplying 2 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 2 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. TP8 is used to monitor the output voltage with TP9 as the ground reference. Table 4-1. Connection and Test Points Reference Designator Function J1 VIN (see Table 1-1 for VIN range) J2 VOUT, 1.05 V at 2-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 connector. TP3 EN test point TP4 Loop response measurement test point TP5 VREG5 test point TP6 Switch node test point TP7 Analog ground test point TP8 Output voltage test point at VOUT connector TP9 Ground test point at VOUT connector 4.2 Start-Up Procedure 1. Ensure that the jumper at JP1 (Enable control) is set from EN to OFF. 2. Apply appropriate VIN voltage to VIN and PGND terminals at J1. 3. Move the jumper at JP1 (Enable control) to cover EN and ON. The EVM enables the output voltage. 6 TPS54239 Step-Down Converter Evaluation Module User's Guide SLVU835A – JANUARY 2013 – REVISED OCTOBER 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Test Setup and Results 4.3 Efficiency Figure 4-1 shows the efficiency for the TPS54239EVM-056 at an ambient temperature of 25°C. 100 90 80 Efficiency - % 70 VIN = 12 V 60 VIN = 5 V 50 40 30 20 10 0 0 0.5 1 1.5 2 Output Current - A C001 Figure 4-1. TPS54239EVM-056 Efficiency Figure 4-2 shows the efficiency at light loads for the TPS54239EVM-056 at an ambient temperature of 25°C. 100 90 80 VIN = 5 V Efficiency - % 70 60 50 40 30 VIN = 12 V 20 10 0 0.001 0.01 0.1 1 10 Output Current - A C002 Figure 4-2. TPS54239EVM-056 Light-Load Efficiency SLVU835A – JANUARY 2013 – REVISED OCTOBER 2021 TPS54239 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 7 Test Setup and Results www.ti.com 4.4 Load Regulation The load regulation for the TPS54239EVM-056 is shown in Figure 4-3. 0.5 0.4 0.3 Load Regulation - % 0.2 VIN = 12 V 0.1 0.0 ±0.1 ±0.2 VIN = 5 V ±0.3 ±0.4 ±0.5 0 0.5 1 1.5 2 Output Current - A C003 Figure 4-3. TPS54239EVM-056 Load Regulation, VIN = 5 V and VIN = 12 V 4.5 Line Regulation The line regulation for the TPS54239EVM-056 is shown in Figure 4-4. 1.0 0.8 0.6 Line Rgulation - % 0.4 IOUT = 1.0 A 0.2 0.0 ±0.2 ±0.4 ±0.6 ±0.8 ±1.0 4 8 12 16 20 24 Input Voltage - V C004 Figure 4-4. TPS54239EVM-056 Line Regulation 8 TPS54239 Step-Down Converter Evaluation Module User's Guide SLVU835A – JANUARY 2013 – REVISED OCTOBER 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Test Setup and Results 4.6 Load Transient Response The TPS54239EVM-056 response to load transient is shown in Figure 4-5. The current step is from 0.5 A to 1.5 A. Total peak-to-peak voltage variation is as shown. VOUT = 20 mV / div (ac coupled) IOUT = 500 mA / div Load step = 0.5 - 1.5 A, slew rate = 500 mA / µsec Time = 200 µsec / div Figure 4-5. TPS54239EVM-056 Load Transient Response 4.7 Output Voltage Ripple The TPS54239EVM-056 output voltage ripple is shown in Figure 4-6. The output current is the rated full load of 2 A. VOUT = 20 mV / div (ac coupled) SW = 5 V / div Time = 1 µsec / div Figure 4-6. TPS54239EVM-056 Output Voltage Ripple (IOUT = 2 A) SLVU835A – JANUARY 2013 – REVISED OCTOBER 2021 TPS54239 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 9 Test Setup and Results www.ti.com The TPS54239EVM-056 output voltage ripple is shown in Figure 4-7. The output current is 0 A (no load). VOUT = 20 mV / div (ac coupled) SW = 5 V / div Time = 1 µsec / div Figure 4-7. TPS54239EVM-056 Output Voltage Ripple (IOUT = 0 A) 4.8 Input Voltage Ripple The TPS54239EVM-056 input voltage ripple is shown in Figure 4-8. The output current is the rated full load of 2 A. VIN = 50 mV / div (ac coupled) SW = 5 V / div Time = 1 µsec / div Figure 4-8. TPS54239EVM-056 Input Voltage Ripple 10 TPS54239 Step-Down Converter Evaluation Module User's Guide SLVU835A – JANUARY 2013 – REVISED OCTOBER 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Test Setup and Results 4.9 Start-Up The TPS54239EVM-056 start-up waveforms relative to VIN and EN are shown in Figure 4-9 and Figure 4-10. RLOAD = 1 Ω. VIN = 10 V / div EN = 10 V / div SS = 5 V / div VOUT = 1 V / div Time = 2 msec / div Figure 4-9. TPS54239EVM-056 Start-Up Relative to VIN with SS VIN = 10 V / div EN = 10 V / div SS = 5 V / div VOUT = 1 V / div Time = 2 msec / div Figure 4-10. TPS54239EVM-056 Start-Up Relative to EN with SS SLVU835A – JANUARY 2013 – REVISED OCTOBER 2021 TPS54239 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 11 Test Setup and Results www.ti.com 4.10 Shut-Down The TPS54239EVM-056 shut-down waveforms relative to VIN and EN are shown in Figure 4-11 and Figure 4-12. RLOAD = 1 Ω. VIN = 10 V / div EN = 10 V / div SS = 5 V / div VOUT = 1 V / div Time = 2 msec / div Figure 4-11. TPS54239EVM-056 Shut-Down Relative to VIN with SS VIN = 10 V / div EN = 10 V / div SS = 5 V / div VOUT = 1 V / div Time = 2 msec / div Figure 4-12. TPS54239EVM-056 Shut-Down Relative to EN with SS 12 TPS54239 Step-Down Converter Evaluation Module User's Guide SLVU835A – JANUARY 2013 – REVISED OCTOBER 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Board Layout 5 Board Layout This section provides description of the TPS54239EVM-056, board layout, and layer illustrations. 5.1 Layout The board layout for the TPS54239EVM-056 is shown in Figure 5-1 through Figure 5-5. The top layer contains the main power traces for VIN, VO, and ground. Also on the top layer are connections for the pins of the TPS54239 and a large area filled with ground. Many of the signal traces also are located on the top side. The input decoupling capacitors are located as close to the IC as possible. The input and output connectors, test points, and all of the components are located on the top side. An analog ground (GND) area is provided on the top side. Analog ground (GND) and power ground (PGND) are connected at a single point on the top layer near C6. The two internal layers are completely dedicated to power ground planes. The bottom layer is primarily power ground. A copper pour area on the bottom layer is used to connect the switching node (SW) to the output inductor and the boost capacitor. Traces also connect enable control jumper, EN, VREG5, and LOOP test points, and the feedback trace from VOUT to the voltage setpoint divider network. Figure 5-1. Top Assembly SLVU835A – JANUARY 2013 – REVISED OCTOBER 2021 TPS54239 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 13 Board Layout www.ti.com Figure 5-2. Top Layer Figure 5-3. Internal Layer 1 14 TPS54239 Step-Down Converter Evaluation Module User's Guide SLVU835A – JANUARY 2013 – REVISED OCTOBER 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Board Layout Figure 5-4. Internal Layer 2 Figure 5-5. Bottom Layer SLVU835A – JANUARY 2013 – REVISED OCTOBER 2021 TPS54239 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 15 Schematic, Bill of Materials, and Reference www.ti.com 6 Schematic, Bill of Materials, and Reference 6.1 Schematic Figure 6-1 is the schematic for the TPS54239EVM-056. TP1 J1 VIN 1 GND 2 TP2 C1 C2 10uF 10uF C3 0.1uF JP1 R3 0 TP4 ON 1 EN 2 OFF 3 TP3 R4 10.0k U1 TPS54239 7 R1 8.25k 5 VOUT C4 6 TP5 1 8 R5 R2 TP7 C5 0 VIN EN VBST VFB SW VREG5 GND SS THERMAL PAD 2 1 C7 0.1uF 0.47uF C8 9 8200pF L1 2.2 uH TP8 VOUT 4 D1 C6 22.1k TP6 3 1 C9 C10 22uF 22uF J2 C11 TP9 1 2 VOUT 1 GND R6 1 1 1 Not Installed Figure 6-1. TPS54239EVM-056 Schematic Diagram 16 TPS54239 Step-Down Converter Evaluation Module User's Guide SLVU835A – JANUARY 2013 – REVISED OCTOBER 2021 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated www.ti.com Schematic, Bill of Materials, and Reference 6.2 Bill of Materials Table 6-1. Bill of Materials RefDes Qty Value Description Size Part Number MFR C1, C2 2 10uF Capacitor, Ceramic, 25V, X5R, 20% 1210 Std Std C3 1 0.1uF Capacitor, Ceramic, 50V, X7R, 10% 1206 Std Std C4, C8 0 Open Capacitor, Ceramic 0603 Std Std C5 1 0.47uF Capacitor, Ceramic, 16V, X7R, 10% 0603 Std Std C6 1 8200pF Capacitor, Ceramic, 25V, X7R , 10% 0603 Std Std C7 1 0.1uF Capacitor, Ceramic, 50V, X7R, 10% 0603 Std Std C9, C10 2 22uF Capacitor, Ceramic, 6.3V, X5R, 20% 1206 C3216X5R0J226M TDK C11 1 Open Capacitor, Ceramic 1206 Std Std D1 0 Open Diode, 0.5 A, 30 V, 2PIN TUMD2 RSX051VA-30 Rohm 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 2.2uH Inductor, SMT, 5.5A, 14.6 mΩ 0.256 x 0.280 inch CLF7045T-2R2N 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, R5 2 0 Resistor, Chip, 1/16W, 1% 0603 Std Std R4 1 10.0k Resistor, Chip, 1/16W, 1% 0603 Std Std R5 0 Open Resistor, Chip, 1/16W, 1% 0603 Std Std TP1, TP3, TP4, TP5, TP6, TP8 3 5000 Test Point, Red, Thru Hole Color Keyed 0.100 x 0.100 inch 5000 Keystone TP2, TP7, TP9 3 5001 Test Point, Black, Thru Hole Color Keyed 0.100 x 0.100 inch 5001 Keystone U1 1 TPS54239DDA IC, 4.5-23 V Input, 2-A Sync. Step-Down SWIFT Converter SO8[DDA] TPS54239DDA TI 0.100 929950-00 3M PWR056 Any – 1 Shunt, 100-mil, Black – 1 PCB 6.3 Reference Texas Instruments, TPS54239, 4.5-V to 23-V Input, 2-A Synchronous Step-Down SWIFT™ Converter Data Sheet 7 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision * (January 2013) to Revision A (October 2021) Page • Updated user's guide title................................................................................................................................... 3 • Updated the numbering format for tables, figures, and cross-references throughout the document. ................3 SLVU835A – JANUARY 2013 – REVISED OCTOBER 2021 TPS54239 Step-Down Converter Evaluation Module User's Guide Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated 17 IMPORTANT NOTICE AND DISCLAIMER TI PROVIDES TECHNICAL AND RELIABILITY DATA (INCLUDING DATA SHEETS), DESIGN RESOURCES (INCLUDING REFERENCE DESIGNS), APPLICATION OR OTHER DESIGN ADVICE, WEB TOOLS, SAFETY INFORMATION, AND OTHER RESOURCES “AS IS” AND WITH ALL FAULTS, AND DISCLAIMS ALL WARRANTIES, EXPRESS AND IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY RIGHTS. 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