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User's Guide

SLVU382–August 2010

TPS54425EVM-608 4-A, SWIFT™ Regulator Evaluation

Module

This user's guide contains information for the TPS54425 as well as support documentation for the

TPS54425EVM-608 evaluation module. Included are the performance specifications, schematic, and the

bill of materials of the TPS54425EVM-608.

Contents

1 Introduction .................................................................................................................. 2

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

3 Modifications ................................................................................................................. 3

3.1 Output Voltage Setpoint ........................................................................................... 3

4 Test Setup and Results .................................................................................................... 3

4.1 Input/Output Connections ......................................................................................... 4

4.2 Start-Up Procedure ................................................................................................ 4

4.3 Efficiency ............................................................................................................ 5

4.4 Load Regulation .................................................................................................... 7

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 ............................................................................................................ 10

5 Board Layout ............................................................................................................... 11

5.1 Layout .............................................................................................................. 11

6 Schematic, Bill of Materials, and Reference ........................................................................... 15

6.1 Schematic ......................................................................................................... 15

6.2 Bill of Materials .................................................................................................... 15

6.3 Reference .......................................................................................................... 16

List of Figures

1 TPS54425EVM-608 Efficiency ............................................................................................ 5

2 TPS54425EVM-608 Light Load Efficiency............................................................................... 6

3 TPS54425EVM-608 Load Regulation .................................................................................... 7

4 TPS54425EVM-608 Line Regulation..................................................................................... 8

5 TPS54425EVM-608 Load Transient Response......................................................................... 9

6 TPS54425EVM-608 Output Voltage Ripple ............................................................................. 9

7 TPS54425EVM-608 Input Voltage Ripple.............................................................................. 10

8 TPS54425EVM-608 Start-Up Relative to V

.......................................................................... 10

9 TPS54425EVM-608 Start-Up Relative to EN .......................................................................... 11

10 Top Assembly.............................................................................................................. 12

11 Top Layer................................................................................................................... 12

12 Internal Layer 1 ............................................................................................................ 13

13 Internal Layer 2 ............................................................................................................ 13

14 Bottom Layer............................................................................................................... 14

SWIFT, D-CAP2 are trademarks of Texas Instruments.

SLVU382–August 2010 TPS54425EVM-608 4-A, SWIFT™ Regulator Evaluation Module

Summary of content (18 pages)

PAGE 1
User's Guide SLVU382 – August 2010 TPS54425EVM-608 4-A, SWIFT™ Regulator Evaluation Module This user's guide contains information for the TPS54425 as well as support documentation for the TPS54425EVM-608 evaluation module. Included are the performance specifications, schematic, and the bill of materials of the TPS54425EVM-608. 1 2 3 4 5 6 Contents Introduction ..................................................................................................................
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Introduction www.ti.com 15 Bottom Assembly .......................................................................................................... 14 16 TPS54425EVM-608 Schematic Diagram............................................................................... 15 List of Tables 1 1 Input Voltage and Output Current Summary ............................................................................ 2 2 TPS54425EVM-608 Performance Specifications Summary 3 Output Voltages ..................
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Modifications www.ti.com 3 Modifications These evaluation modules are designed to provide access to the features of the TPS54425. 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 and Equation 2. For output voltage from 0.76 V to 2.
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Test Setup and Results 4.1 www.ti.com Input/Output Connections The TPS54425EVM-608 is provided with input/output connectors and test points as shown in Table 4. 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.
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Test Setup and Results www.ti.com 4.3 Efficiency Figure 1 shows the efficiency for the TPS54425EVM-608 at an ambient temperature of 25°C. 100 VIN = 5 V VOUT = 1.05 V 90 80 Efficiecny - % 70 VIN = 12 V 60 50 40 30 20 10 0 0 0.5 1 1.5 2 2.5 3 3.5 4 Output Current - A Figure 1.
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Test Setup and Results www.ti.com Figure 2 shows the efficiency at light loads for the TPS54425EVM-608 at an ambient temperature of 25°C. 100 VOUT = 1.05 V 90 VIN = 5 V 80 Efficiecny - % 70 60 50 40 VIN = 12 V 30 20 10 0 0.01 0.1 1 10 Output Current - A Figure 2.
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Test Setup and Results www.ti.com 4.4 Load Regulation The load regulation for the TPS54425EVM-608 is shown in Figure 3. 1 VIN = 5 V VOUT = 1.05 V Output Voltage Deviation - % 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 0 0.5 1 1.5 2 2.5 3 3.5 4 Output Current - A Figure 3.
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Test Setup and Results 4.5 www.ti.com Line Regulation The line regulation for the TPS54425EVM-608 is shown in Figure 4. 0.5 IOUT = 2 A VOUT = 1.05 V Output Voltage Deviation - % 0.4 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 4.5 6 7.5 9 10.5 12 13.5 15 16.5 18 Input Voltage - V Figure 4.
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Test Setup and Results www.ti.com 4.6 Load Transient Response The TPS54425EVM-608 response to load transient is shown in Figure 5. The current step is from 1 A to 3 A. Total peak-to-peak voltage variation is as shown. VOUT = 50 mV / div (ac coupled) IOUT = 1 A / div (1 A to 3 A load step) Time = 100 usec / div Figure 5. TPS54425EVM-608 Load Transient Response 4.7 Output Voltage Ripple The TPS54425EVM-608 output voltage ripple is shown in Figure 6. The output current is the rated full load of 4 A.
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Test Setup and Results 4.8 www.ti.com Input Voltage Ripple The TPS54425EVM-608 input voltage ripple is shown in Figure 7. The output current is the rated full load of 4 A. VIN = 50 mV / div (ac coupled) SW1, SW2 = 5 V / DIV Time = 1 usec / div Figure 7. TPS54425EVM-608 Input Voltage Ripple 4.9 Start-Up The TPS54425EVM-608 start-up waveform relative to VIN is shown in Figure 8. VIN = 10 V / div VOUT = 500 mV / div PG = 5 V / div Time = 1 msec / div Figure 8.
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Board Layout www.ti.com The TPS54425EVM-608 start-up waveform relative to enable (EN) is shown in Figure 9. EN = 10 V / div VOUT = 500 mV / div PG = 5 V / div Time = 1 msec / div Figure 9. TPS54425EVM-608 Start-Up Relative to EN 5 Board Layout This section provides description of the TPS54425EVM-608, board layout, and layer illustrations. 5.1 Layout The board layout for the TPS54425EVM-608 is shown in Figure 10 through Figure 15.
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Board Layout www.ti.com Figure 10. Top Assembly Figure 11.
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Board Layout www.ti.com Figure 12. Internal Layer 1 Figure 13.
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Board Layout www.ti.com Figure 14. Bottom Layer Figure 15.
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Schematic, Bill of Materials, and Reference www.ti.com 6 Schematic, Bill of Materials, and Reference 6.1 Schematic Figure 16 is the schematic for the TPS54425EVM-538. Figure 16. TPS54425EVM-608 Schematic Diagram 6.2 Bill of Materials Table 5.
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Schematic, Bill of Materials, and Reference 6.3 www.ti.com Reference 1.
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Evaluation Board/Kit Important Notice Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.