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User's Guide

SLVU264 – November 2008

TPS54233EVM-373 2-A, SWIFT™ Regulator Evaluation

Module

Contents

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

2 Test Setup and Results ..................................................................................................... 3

3 Board Layout ................................................................................................................. 9

4 Schematic and Bill of Materials ........................................................................................... 11

List of Figures

1 TPS54233EVM-373 Efficiency ............................................................................................. 4

2 TPS54233EVM-373 Low Current Efficiency ............................................................................. 5

3 TPS54233EVM-373 Load Regulation ..................................................................................... 5

4 TPS54233EVM-373 Line Regulation ...................................................................................... 6

5 TPS54233EVM-373 Transient Response ............................................................................... 6

6 TPS54233EVM-373 Loop Response ..................................................................................... 7

7 TPS54233EVM-373 Output Ripple ....................................................................................... 7

8 TPS54233EVM-373 Input Ripple ......................................................................................... 8

9 TPS54233EVM-373 Start-Up Relative to V

............................................................................ 8

10 TPS54233EVM-373 Start-up Relative to Enable ....................................................................... 9

11 TPS54233EVM-373 ECO_MODE™ Operation .......................................................................... 9

12 TPS54233EVM-373 Top-Side Layout ................................................................................... 10

13 TPS54233EVM-373 Bottom-Side Layout ............................................................................... 10

14 TPS54233EVM-373 Top-Side Assembly................................................................................ 11

15 TPS54233EVM-373 Schematic .......................................................................................... 12

List of Tables

1 Input Voltage and Output Current Summary ............................................................................. 2

2 TPS54233EVM-373 and Performance Specification Summary ....................................................... 2

3 Output Voltages Available .................................................................................................. 3

4 EVM Connectors and Test Points ......................................................................................... 4

5 TPS54233EVM-373 Bill of Materials ..................................................................................... 13

SWIFT, ECO_MODE are trademarks of Texas Instruments.

SLVU264 – November 2008 TPS54233EVM-373 2-A, SWIFT™ Regulator Evaluation Module 1

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Summary of content (15 pages)

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User's Guide SLVU264 – November 2008 TPS54233EVM-373 2-A, SWIFT™ Regulator Evaluation Module 1 2 3 4 Contents Introduction ................................................................................................................... 2 Test Setup and Results ..................................................................................................... 3 Board Layout .................................................................................................................
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Introduction 1 www.ti.com Introduction This user's guide contains background information for the TPS54233 as well as support documentation for the TPS54233EVM-373 evaluation module (HPA373). Also included are the performance specifications, the schematic, and the bill of materials for the TPS54233EVM-373. 1.1 Background The TPS54233 dc/dc converter is designed to provide up to a 2 A output from an input voltage source of 3.5 V to 28 V.
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Test Setup and Results www.ti.com 1.3 Modifications These evaluation modules are designed to provide access to the features of the TPS54233. Some modifications can be made to this module. 1.3.1 Output Voltage Set Point To change the output voltage of the EVM, it is necessary to change the value of resistor R6. Changing the value of R6 can change the output voltage above 0.8 V. The value of R6 for a specific output voltage can be calculated using Equation 1. 0.8 V R6 = 10.2 kW ´ VOut - 0.
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Test Setup and Results www.ti.com Table 4. EVM Connectors and Test Points Reference Designator 2.2 Function J1 VIN (see Table 1 for VIN range) J2 2-pin header for enable. Connect EN to ground to disable, open to enable. J3 2-pin header for slow start monitor and GND. J4 VOUT, 3.3 V at 2 A maximum TP1 VIN test point at VIN connector TP2 GND test point at VIN TP3 PH test point TP4 Test point between voltage divider network and output. Used for loop response measurements.
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Test Setup and Results www.ti.com 100 95 VIN = 18 V 90 VIN = 12 V VIN = 15 V Efficiency - % 85 80 75 VIN = 18 V 70 65 60 55 50 0 20 40 60 80 100 120 140 160 180 200 IO - Output Current - mA Figure 2. TPS54233EVM-373 Low Current Efficiency The efficiency may be lower at higher ambient temperatures, due to temperature variation in the drain-to-source resistance of the internal MOSFET. 2.3 Output Voltage Load Regulation The load regulation for the TPS54233EVM-373 is shown in Figure 3. 0.05 0.
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Test Setup and Results 2.4 www.ti.com Output Voltage Line Regulation The line regulation for the TPS54233EVM-373 is shown in Figure 4. 0.025 IO = 1 A 0.020 Output Regulation - % 0.015 0.010 0.005 0 -0.005 -0.010 -0.015 -0.020 -0.025 8 9 10 11 12 13 14 15 VI - Input Voltage -V 16 17 18 Figure 4. TPS54233EVM-373 Line Regulation 2.5 Load Transients The TPS54233EVM-373 response to load transients is shown in Figure 5. The current step is from 25% to 75% of maximum rated load.
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Test Setup and Results www.ti.com 2.6 Loop Characteristics The TPS54233EVM-373 loop-response characteristics are shown in Figure 6 . Gain and phase plots are shown for VIN voltage of 15 V. Load current for the measurement is 1 A. 180 Gain Phase 60 -180 -60 10 1M f - Frequency - Hz Figure 6. TPS54233EVM-373 Loop Response 2.7 Output Voltage Ripple The TPS54233EVM-373 output voltage ripple is shown in Figure 7 . The output current is the rated full load of 2 A.
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Test Setup and Results 2.8 www.ti.com Input Voltage Ripple The TPS54233EVM-373 input voltage ripple is shown in Figure 8 . The output current is the rated full load of 2 A. Voltage is measured directly across the input capacitors. VIN PH Figure 8. TPS54233EVM-373 Input Ripple 2.9 Powering Up The start-up waveforms are shown in Figure 9 and Figure 10. In Figure 9, the top trace shows VIN, and the bottom trace shows VOUT.
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Board Layout www.ti.com VIN VOUT Figure 10. TPS54233EVM-373 Start-up Relative to Enable VOUT PH Figure 11. TPS54233EVM-373 ECO_MODE™ Operation 3 Board Layout This section provides a description of the TPS54233EVM-373, board layout, and layer illustrations. 3.1 Layout The board layout for the TPS54233EVM-373 is shown in Figure 12 through Figure 14. The topside layer of the EVM is laid out in a manner typical of a user application. The top and bottom layers are 2-oz. copper.
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Board Layout www.ti.com The input decoupling capacitors (C1, C2, and C3) and bootstrap capacitor (C4) are all located as close to the IC as possible. In addition, the voltage set-point resistor divider components are also kept close to the IC. The voltage divider network ties to the output voltage at the point of regulation, the copper VOUT trace past the output capacitor C9. For the TPS54233, an additional input bulk capacitor may be required, depending on the EVM connection to the input supply.
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Schematic and Bill of Materials www.ti.com Figure 14. TPS54233EVM-373 Top-Side Assembly 3.2 Estimated Circuit Area The estimated printed circuit board area for the components used in the design of this circuit is 0.72 in2. This area does not include test points or connectors. 4 Schematic and Bill of Materials This section presents the TPS54233EVM-373 schematic and bill of materials.
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Schematic and Bill of Materials 4.1 www.ti.com Schematic + Figure 15 is the schematic for the TPS54233EVM-373. Figure 15.
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Schematic and Bill of Materials www.ti.com 4.2 Bill of Materials Table 5 presents the bill of materials for the TPS54233EVM-373. Table 5. TPS54233EVM-373 Bill of Materials Cou nt RefDes Value Description Size 0 C1 Open Capacitor, Ceramic 1206 1 C2 10 µF Capacitor, Ceramic, 25V, X5R, 10% 1206 0 C3 Open Capacitor, Ceramic 0603 1 C4 0.1 µF Capacitor, Ceramic, 16V, X7R, 10% 1 C5 0.
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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.