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User's Guide

SLVU767–August 2012

TPS542951 Dual Channel SWIFT™ Evaluation Module

This user's guide contains information for the TPS542951EVM-057 evaluation module as well as for the

TPS542951. Included are the performance specifications, schematic, and the bill of materials of the

TPS542951 EVM.

Contents

1 Introduction .................................................................................................................. 3

2 Performance Specification Summary ..................................................................................... 3

3 Modifications ................................................................................................................. 4

3.1 Output Voltage Setpoint ........................................................................................... 4

3.2 Output Filter and Closed-Loop Response ...................................................................... 4

4 Test Setup and Results .................................................................................................... 5

4.1 Input/Output Connections ......................................................................................... 5

4.2 Start-Up Procedure ................................................................................................ 5

4.3 Efficiency ............................................................................................................ 6

4.4 Load Regulation .................................................................................................... 8

4.5 Line Regulation ..................................................................................................... 9

4.6 Load Transient Response ....................................................................................... 10

4.7 Output Voltage Ripple ........................................................................................... 11

4.8 Input Voltage Ripple .............................................................................................. 13

4.9 Start-Up ............................................................................................................ 14

5 Board Layout ............................................................................................................... 16

5.1 Layout .............................................................................................................. 16

6 Schematic, Bill of Materials, and Reference ........................................................................... 20

6.1 Schematic ......................................................................................................... 20

6.2 Bill of Materials .................................................................................................... 21

6.3 Reference .......................................................................................................... 21

List of Figures

1 TPS542951EVM Converter 1 Efficiency ................................................................................. 6

2 TPS542951EVM Converter 1 Light Load Efficiency.................................................................... 6

3 TPS542951EVM Converter 2 Efficiency ................................................................................. 7

4 TPS542951EVM Converter 2 Light Load Efficiency.................................................................... 7

5 TPS542951EVM Converter 1 Load Regulation......................................................................... 8

6 TPS542951EVM Converter 2 Load Regulation......................................................................... 8

7 TPS542951EVM Converter 1 Line Regulation.......................................................................... 9

8 TPS542951EVM Converter 2 Line Regulation.......................................................................... 9

9 TPS542951EVM Converter 1 Load Transient Response ............................................................ 10

10 TPS542951EVM Converter 2 Load Transient Response ............................................................ 10

11 TPS542951EVM Converter 1 Output Voltage Ripple................................................................. 11

12 TPS542951EVM Converter 1 Eco-mode™ Output Voltage Ripple at No Load................................... 11

13 TPS542951EVM Converter 2 Output Voltage Ripple................................................................. 12

14 TPS542951EVM Converter 2 Eco-mode™ Output Voltage Ripple at No Load................................... 12

15 TPS542951EVM Input Voltage Ripple.................................................................................. 13

SWIFT, Eco-mode, D-CAP2 are trademarks of Texas Instruments.

SLVU767–August 2012 TPS542951 Dual Channel SWIFT™ Evaluation Module

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Summary of content (30 pages)

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User's Guide SLVU767 – August 2012 TPS542951 Dual Channel SWIFT™ Evaluation Module This user's guide contains information for the TPS542951EVM-057 evaluation module as well as for the TPS542951. Included are the performance specifications, schematic, and the bill of materials of the TPS542951 EVM. 1 2 3 4 5 6 Contents Introduction .................................................................................................................. 3 Performance Specification Summary ......................
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www.ti.com 16 17 18 19 20 21 22 23 24 25 26 ............................................................... TPS542951EVM Start-Up Relative to EN1 ............................................................................ TPS542951EVM Converter 2 Start-Up Relative to VIN ............................................................... TPS542951EVM Start-Up Relative to EN2 ............................................................................ Top Assembly .............................................
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Introduction www.ti.com 1 Introduction The TPS542951 is a dual, 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 of 700 kHz.
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Modifications 3 www.ti.com Modifications This evaluation module is designed to provide access to the features of the TPS542951. Some modifications can be made to this module. 3.1 Output Voltage Setpoint To change the output voltages of the EVM, it is necessary to change the value of the top resistor of the feedback divider, R1 or R3. Please refer to the top assembly in Figure 20 to locate the resistors close to the output connectors. Changing the value of R1 or R3 can change the output voltage above 0.
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Test Setup and Results www.ti.com 4 Test Setup and Results This section describes how to properly connect, set up, and use the TPS542951EVM. 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 TPS542951EVM is provided with input/output connectors and test points as shown in Table 4.
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Test Setup and Results 4.3 www.ti.com Efficiency 4.3.1 Efficiency of Converter 1 Figure 1 shows the efficiency for the converter 1 on the TPS542951EVM at an ambient temperature of 25°C. 100 90 80 Efficiency (%) 70 60 50 40 30 20 VIN = 6 V VIN = 12 V VIN = 18 V 10 0 0.00 0.25 0.50 0.75 1.00 Output Current (A) 1.25 1.50 1.75 2.00 G005 Figure 1. TPS542951EVM Converter 1 Efficiency Figure 2 shows the light load efficiency for converter 1 on the TPS542951EVM at an ambient temperature of 25°C.
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Test Setup and Results www.ti.com 4.3.2 Efficiency of Converter 2 Figure 3 shows the efficiency for the converter 2 on the TPS542951EVM at an ambient temperature of 25°C. 100 90 80 Efficiency (%) 70 60 50 40 30 20 VIN = 5 V VIN = 12 V VIN = 18 V 10 0 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 Output Current (A) 2.00 2.25 2.50 2.75 3.00 G005 Figure 3.
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Test Setup and Results 4.4 www.ti.com Load Regulation 4.4.1 Load Regulation of Converter 1 The load regulation for the converter 1 on the TPS542951EVM is shown in Figure 5. On the EVM, the load regulation of converter 1 is independent on the load of converter 2. 1.2 VIN = 6 V VIN = 12 V 1 Output Voltage Deviation (%) 0.8 0.6 0.4 0.2 0 −0.2 −0.4 −0.6 −0.8 −1 −1.2 0.00 0.25 0.50 0.75 1.00 Output Current (A) 1.25 1.50 1.75 2.00 G008 Figure 5. TPS542951EVM Converter 1 Load Regulation 4.4.
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Test Setup and Results www.ti.com 4.5 Line Regulation 4.5.1 Line Regulation Converter 1 The line regulation of converter 1 on the TPS542951EVM is shown in Figure 7. 1 0.8 Output Voltage Deviation (%) 0.6 0.4 0.2 0 −0.2 −0.4 −0.6 −0.8 IOUT = 1.0 A −1 6.0 7.5 9.0 10.5 12.0 Input Voltage (V) 13.5 15.0 16.5 18.0 G007 Figure 7. TPS542951EVM Converter 1 Line Regulation 4.5.2 Line Regulation Converter 2 The line regulation of converter 2 on the TPS542951EVM is shown in Figure 8. 1 0.
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Test Setup and Results 4.6 4.6.1 www.ti.com Load Transient Response Load Transient Response Converter 1 The response of converter 1 on the TPS542951EVM to a load transient is shown in Figure 9. VOUT1 = 50 mV/div (ac coupled) Load Current = 1 A/div Load step = 0.5 A to 1.5 A Slew rate = 500 mA/µsec Time = 100 µs/div Figure 9. TPS542951EVM Converter 1 Load Transient Response 4.6.
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Test Setup and Results www.ti.com 4.7 4.7.1 Output Voltage Ripple Output Voltage Ripple Converter 1 The output voltage ripple of converter 1 on the TPS542951EVM is shown in Figure 11. The output current is the rated full load of 2 A. VOUT1 = 50 mV/div (ac coupled) SW1 = 5 V/div Time = 1 µs/div Figure 11. TPS542951EVM Converter 1 Output Voltage Ripple The output voltage ripple of converter 1 on the TPS542951EVM during Eco-mode™ operation at no load is shown in Figure 12.
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Test Setup and Results 4.7.2 www.ti.com Output Voltage Ripple Converter 2 The output voltage ripple of converter 2 on the TPS542951EVM is shown in Figure 13. The output current is the rated full load of 3 A. VOUT2 = 100 mV/div (ac coupled) SW2 = 5 V/div Time = 1 µs/div Figure 13. TPS542951EVM Converter 2 Output Voltage Ripple The output voltage ripple of converter 2 on the TPS542951EVM during Eco-mode™ operation at no load is shown in Figure 14.
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Test Setup and Results www.ti.com 4.8 Input Voltage Ripple The TPS542951EVM input voltage ripple is shown in Figure 15. The output currents are the rated full load currents of 2 A CH1 and 3 A CH2. VIN = 100 mV/div (ac coupled) SW1 = 10 V/div SW2 = 10 V/div Time = 1 µs/div Figure 15.
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Test Setup and Results 4.9 4.9.1 www.ti.com Start-Up Converter 1 Start-Up The TPS542951EVM start-up waveform of converter 1 relative to VIN is shown in Figure 16. VIN = 10 V/div EN1 = 10 V/div SS1 = 5 V/div VOUT1 = 2 V/div Time = 2 ms/div Figure 16. TPS542951EVM Converter 1 Start-Up Relative to VIN The TPS542951EVM start-up waveform of converter 1 relative to EN1 is shown in Figure 17. VIN = 10 V/div EN1 = 10 V/div SS1 = 5 V/div VOUT1 = 2 V/div Time = 2 ms/div Figure 17.
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Test Setup and Results www.ti.com 4.9.2 Converter 2 Start-Up The TPS542951EVM start-up waveform of converter 2 relative to VIN is shown in Figure 18. VIN = 10 V/div EN2 = 10 V/div SS2 = 5 V/div VOUT2 = 2 V/div Time = 2 ms/div Figure 18. TPS542951EVM Converter 2 Start-Up Relative to VIN The TPS542951EVM start-up waveform of converter 2 relative to EN2 is shown in Figure 19. VIN = 10 V/div EN2 = 10 V/div SS2 = 5 V/div VOUT2 = 2 V/div Time = 2 ms/div Figure 19.
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Board Layout 5 www.ti.com Board Layout This section provides a description of the TPS542951EVM, board layout, and layer illustrations. 5.1 Layout The board layout for the TPS542951EVM is shown in Figure 20 through Figure 25. The top layer contains the main power traces for VIN and VOUTx. Also on the top layer are connections for the pins of the TPS542951 and a large area filled with ground. Many of the signal traces also are located on the top side.
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Board Layout www.ti.com Figure 21. Top Layer Figure 22.
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Board Layout www.ti.com Figure 23. Internal 2 Layer Figure 24.
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Board Layout www.ti.com Figure 25.
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Schematic, Bill of Materials, and Reference www.ti.com 6 Schematic, Bill of Materials, and Reference 6.1 Schematic Figure 26 is the schematic for the TPS542951EVM. L2 1.5uH TP3 2 C13 1 J5 TP11 VIN2 R10 EN2 TP8 22uF 10 9 1uF 17 TP15 GND VFB1 PWPD VFB2 C11 C21 1 8 5 7 EN1 PGND1 4 VREG5 VREG5 13 14 12 EN2 PGND2 15 1 2 VIN1 VIN SW1 2 3 1 VBST1 TP1 J1 SW2 16 0.1uF VIN2 C6 10uF VBST2 C5 10uF R3 21.5k TP12 R4 22.
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Schematic, Bill of Materials, and Reference www.ti.com 6.2 Bill of Materials Table 5. Bill of Materials Count RefDes Value Description Size Part Number Manufacturer 1 C11 1 µF Capacitor, ceramic, 16 V, X7R, 10% 0603 GRM188R71C105KA12 Murata 4 C1-2 C45 10 µF Capacitor, ceramic, 25 V, X7R, 10% 1206 GRM31CR71E106KA12 Murata 0 C12-13 open Capacitor, ceramic, 50 V, X7R, 10% 0603 GRM188R71H104KA93 Murata 4 C14-17 22 µF Capacitor, ceramic, 6.
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EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following conditions: The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims arising from the handling or use of the goods.
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FCC Interference Statement for Class B EVM devices This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.
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【Important Notice for Users of this Product in Japan】】 This development kit is NOT certified as Confirming to Technical Regulations of Radio Law of Japan If you use this product in Japan, you are required by Radio Law of Japan to follow the instructions below with respect to this product: 1. 2. 3. Use this product in a shielded room or any other test facility as defined in the notification #173 issued by Ministry of Internal Affairs and Communications on March 28, 2006, based on Sub-section 1.
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EVALUATION BOARD/KIT/MODULE (EVM) WARNINGS, RESTRICTIONS AND DISCLAIMERS For Feasibility Evaluation Only, in Laboratory/Development Environments. Unless otherwise indicated, this EVM is not a finished electrical equipment and not intended for consumer use.
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EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following conditions: The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims arising from the handling or use of the goods.
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FCC Interference Statement for Class B EVM devices This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.
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【Important Notice for Users of this Product in Japan】】 This development kit is NOT certified as Confirming to Technical Regulations of Radio Law of Japan If you use this product in Japan, you are required by Radio Law of Japan to follow the instructions below with respect to this product: 1. 2. 3. Use this product in a shielded room or any other test facility as defined in the notification #173 issued by Ministry of Internal Affairs and Communications on March 28, 2006, based on Sub-section 1.
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EVALUATION BOARD/KIT/MODULE (EVM) WARNINGS, RESTRICTIONS AND DISCLAIMERS For Feasibility Evaluation Only, in Laboratory/Development Environments. Unless otherwise indicated, this EVM is not a finished electrical equipment and not intended for consumer use.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.