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User's Guide

SLVU452–May 2011

TPS54228EVM-686, 2-A, SWIFT™ Regulator Evaluation

Module

This user's guide contains information for the TPS54228 as well as support documentation for the

TPS54228EVM-686 evaluation module. Included are the performance specifications, schematic, and the

bill of materials of the TPS54228EVM-686.

Contents

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

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

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

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

3.2 Output Filter and Closed-Loop Response ...................................................................... 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 .................................................................................................... 6

4.5 Line Regulation ..................................................................................................... 7

4.6 Load Transient Response ........................................................................................ 7

4.7 Output Voltage Ripple ............................................................................................. 8

4.8 Input Voltage Ripple ............................................................................................... 9

4.9 Start-Up ............................................................................................................ 10

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

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

6 Schematic, Bill of Materials, and Reference ........................................................................... 14

6.1 Schematic ......................................................................................................... 14

6.2 Bill of Materials .................................................................................................... 14

6.3 Reference .......................................................................................................... 15

List of Figures

1 TPS54228EVM-686 Efficiency ............................................................................................ 5

2 TPS54228EVM-686 Light-Load Efficiency............................................................................... 5

3 TPS54228EVM-686 Load Regulation, V

= 5 V........................................................................ 6

4 TPS54228EVM-686 Load Regulation, V

= 12 V ...................................................................... 6

5 TPS54228EVM-686 Line Regulation..................................................................................... 7

6 TPS54228EVM-686 Load Transient Response......................................................................... 7

7 TPS54228EVM-686 Output Voltage Ripple ............................................................................. 8

8 TPS54228EVM-686 Start of Eco-mode™ Output Voltage Ripple.................................................... 8

9 TPS54228EVM-686 Eco-mode™ Output Voltage Ripple ............................................................. 9

10 TPS54228EVM-686 Input Voltage Ripple ............................................................................... 9

11 TPS54228EVM-686 Start-Up Relative to V

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

12 TPS54228EVM-686 Start-Up Relative to EN .......................................................................... 10

13 Top Assembly.............................................................................................................. 11

14 Top Layer................................................................................................................... 12

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

SLVU452–May 2011 TPS54228EVM-686, 2-A, SWIFT™ Regulator Evaluation Module

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Summary of content (17 pages)

PAGE 1
User's Guide SLVU452 – May 2011 TPS54228EVM-686, 2-A, SWIFT™ Regulator Evaluation Module This user's guide contains information for the TPS54228 as well as support documentation for the TPS54228EVM-686 evaluation module. Included are the performance specifications, schematic, and the bill of materials of the TPS54228EVM-686. 1 2 3 4 5 6 Contents Introduction ..................................................................................................................
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Introduction www.ti.com 15 Bottom Layer ............................................................................................................... 12 16 Bottom Assembly .......................................................................................................... 13 17 TPS54228EVM-686 Schematic Diagram............................................................................... 14 1 Input Voltage and Output Current Summary .........................................................
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Modifications www.ti.com 3 Modifications These evaluation modules are designed to provide access to the features of the TPS54228. 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 7.0 V: æ R1 ö VO = 0.
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Test Setup and Results 4.1 www.ti.com Input/Output Connections The TPS54228EVM-686 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 TPS54228EVM-686 at an ambient temperature of 25°C. 100 VIN = 5 V 90 80 Efficiecny - % 70 VIN = 12 V 60 50 40 30 20 10 0 0 0.5 1 1.5 2 Output Current - A Figure 1. TPS54228EVM-686 Efficiency Figure 2 shows the efficiency at light loads for the TPS54228EVM-686 at an ambient temperature of 25°C. 100 90 VIN = 5 V 80 Efficiecny - % 70 60 50 VIN = 12 V 40 30 20 10 0 0.001 0.01 0.
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Test Setup and Results 4.4 www.ti.com Load Regulation The load regulation for the TPS54228EVM-686 is shown in Figure 3 and Figure 4 . 1 Output Voltage Deviation - % 0.8 0.6 0.4 VIN = 5 V 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 0 0.5 1 1.5 2 Output Curre nt - A Figure 3. TPS54228EVM-686 Load Regulation, VIN = 5 V 1 0.8 Output Voltage Deviation - % 0.6 0.4 VIN = 12 V 0.2 0 -0.2 -0.4 -0.6 -0.8 -1 0 0.5 1 1.5 2 Output Cur r e nt - A Figure 4.
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Test Setup and Results www.ti.com 4.5 Line Regulation The line regulation for the TPS54228EVM-686 is shown in Figure 5. 0.5 Output Voltage Deviation - % 0.4 0.3 0.2 0.1 0 -0.1 IOUT = 1 A -0.2 -0.3 -0.4 -0.5 4.5 6 7.5 9 10.5 12 13.5 15 16.5 18 Input Volta ge - V Figure 5. TPS54228EVM-686 Line Regulation 4.6 Load Transient Response The TPS54228EVM-686 response to load transient is shown in Figure 6. The current step is from 0.5 A to 1.5 A. Total peak-to-peak voltage variation is as shown.
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Test Setup and Results 4.7 www.ti.com Output Voltage Ripple The TPS54228EVM-686 output voltage ripple is shown in Figure 7. The output current is the rated full load of 2 A. VOUT = 50 mV / div (dc coupled, -950 mV offset) SW = 5 V / div Time = 1 µsec / div Figure 7. TPS54228EVM-686 Output Voltage Ripple The TPS54228EVM-686 output voltage ripple during the start of Eco-mode™ operation is shown in Figure 8 . The output current is 30 mA.
PAGE 9
Test Setup and Results www.ti.com The TPS54228EVM-686 output voltage ripple during Eco-mode™ operation is shown in Figure 9. The output current is 0 mA. VOUT = 50 mV / div (dc coupled, -950 mV offset) SW = 5 V / div Time = 2 msec / div Figure 9. TPS54228EVM-686 Eco-mode™ Output Voltage Ripple 4.8 Input Voltage Ripple The TPS54228EVM-686 input voltage ripple is shown in Figure 10. The output current is the rated full load of 2 A.
PAGE 10
Test Setup and Results 4.9 www.ti.com Start-Up The TPS54228EVM-686 start-up waveform relative to VIN is shown in Figure 11. VIN = 10 V / div SS = 5 V / div VOUT = 500 mV / div Time = 2 msec / div Figure 11. TPS54228EVM-686 Start-Up Relative to VIN The TPS54228EVM-686 start-up waveform relative to enable (EN) is shown in Figure 12. EN = 10 V / div SS = 5 V / div VOUT = 500 mV / div Time = 2 msec / div Figure 12.
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Board Layout www.ti.com 5 Board Layout This section provides description of the TPS54228EVM-686, board layout, and layer illustrations. 5.1 Layout The board layout for the TPS54228EVM-686 is shown in Figure 13 through Figure 16. 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 TPS54228 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 14. Top Layer Figure 15.
PAGE 13
Board Layout www.ti.com Figure 16.
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Schematic, Bill of Materials, and Reference www.ti.com 6 Schematic, Bill of Materials, and Reference 6.1 Schematic Figure 17 is the schematic for the TPS54228EVM-686. Figure 17. TPS54228EVM-686 Schematic Diagram 6.2 Bill of Materials Table 5. Bill of Materials RefDes Qty Value Description Size Part Number MFR C1, C2 2 10uF Capacitor, Ceramic, 25V, X5R, 20% 1210 Std Std C11 0 Open Capacitor, Ceramic 1206 Std Std C3, C7 2 0.
PAGE 15
www.ti.com 6.3 Schematic, Bill of Materials, and Reference Reference 1. TPS54228, 4.
PAGE 16
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.
PAGE 17
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.