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1 Introduction

1.1 Background

User's Guide

SLVU151 – March 2006

TPS54550EVM-158 SWIFT™ Regulator Evaluation Module

Contents

1 Introduction .......................................................................................... 1

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

3 Board Layout ........................................................................................ 8

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

List of Figures

1 Measured Efficiency, TPS54550 ................................................................. 4

2 Load Regulation .................................................................................... 4

3 Line Regulation ..................................................................................... 5

4 Load Transient Response, TPS54550 ........................................................... 5

5 Measured Loop Response, TPS54550, VIN = 12 V ........................................... 6

6 Measured Output Voltage Ripple, TPS54550 .................................................. 6

7 Input Voltage Ripple, TPS54550 ................................................................. 7

8 Power Up, OUT Relative to VIN ................................................................. 7

9 Top-Side Layout .................................................................................... 9

10 Bottom-Side Layout (Looking From Top Side) ................................................ 10

11 Top-Side Assembly ............................................................................... 11

12 TPS54550EVM-158 Schematic ................................................................. 12

List of Tables

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

2 TPS54550EVM-158 Performance Specification Summary ................................... 2

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

4 EVM Connectors and Test Points ................................................................ 3

5 TPS54550EVM-158 Bill of Materials ........................................................... 13

This user's guide contains background information for the TPS54550 as well as support documentation for

the TPS54550EVM-158 evaluation module (HPA158). Also included are the performance specifications,

the schematic, and the bill of materials for the TPS54550EVM-158.

The TPS54550 dc/dc converter is designed to provide up to a 6-A output from an input voltage source of

4.5 V to 20 V. Rated input voltage and output current range for the evaluation module is given in Table 1 .

This evaluation module is designed to demonstrate the small printed-circuit-board areas that may be

achieved when designing with the TPS54550 regulator. The maximum EVM input voltage of 17 V, is the

result of the 3.3-V output voltage. The switching frequency is internally set at a nominal 700 kHz. The

high-side MOSFET is incorporated inside the TPS54550 package along with the gate drive circuitry. The

SWIFT, PowerPAD are trademarks of Texas Instruments.

SLVU151 – March 2006 TPS54550EVM-158 SWIFT™ Regulator Evaluation Module 1

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Summary of content (15 pages)

PAGE 1
User's Guide SLVU151 – March 2006 TPS54550EVM-158 SWIFT™ Regulator Evaluation Module 1 2 3 4 Contents Introduction .......................................................................................... 1 Test Setup and Results ............................................................................ 3 Board Layout ........................................................................................ 8 Schematic and Bill of Materials ...............................................................
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www.ti.com Introduction low drain-to-source on resistance of the MOSFET allows the TPS54550 to achieve high efficiencies and helps to keep the junction temperature low at high output currents. An external divider allows for an adjustable output voltage. External compensation components accommodate a wide range of output filter components. Additionally, the TPS54550 provides an enable input. The absolute maximum input voltage is 20 V. Table 1. Input Voltage and Output Current Summary 1.
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www.ti.com Test Setup and Results Table 3. Output Voltages Available 1.3.2 Output Voltage (V) R2 Value (kΩ) 1.8 9.76 2.5 5.49 3.3 3.74 5 2.15 Input Voltage Range The EVM is designed to operate from a nominal 12 V or 15 V with a working operating range of 6-V to 17-V input voltage. The TPS54550 is specified to operate over an input voltage range of 4.5 V to 20 V. The upper voltage limit of 17 V is due to minimum on time restrictions to guarantee 3.3-V output.
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www.ti.com Test Setup and Results 100 VI = 9 V VI = 6 V Efficiency - % 95 90 VI = 12 V 85 VI = 15 V VI = 17 V 80 VO = 3.3 V, fS = 700 kHz 75 0 1 2 3 IO - Output Current - A 4 5 Figure 1. Measured Efficiency, TPS54550 2.3 Output Voltage Regulation The output voltage load regulation of the TPS54550EVM-158 is shown in Figure 2; the output voltage line regulation is shown in Figure 3. Measurements are given for an ambient temperature of 25°C. 0.15 Load Regulation - % 0.1 0.
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www.ti.com Test Setup and Results 0.15 IO = 2.5 A 0.1 Output Regulation - % IO = 5 A 0.05 0 IO = 0 A -0.05 -0.1 -0.15 6 7 8 9 10 11 12 13 14 VI - Input Voltage - V 15 16 17 Figure 3. Line Regulation 2.4 Load Transients The TPS54550EVM-158 response to load transients is shown in Figure 4. The current step is from 25% to 75% of maximum rated load. Total peak-to-peak voltage variation is as shown, including ripple and noise on the output. VI = 12 V, VO = 3.
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www.ti.com Test Setup and Results 2.5 Loop Characteristics The TPS54550EVM-158 loop-response characteristics are shown in Figure 5. Gain and phase plots are shown for VIN voltage of 12 V and load current of 2.5 A. 70 210 180 Phase 50 150 40 120 30 90 Gain 20 60 10 30 0 Phase - Degrees G - Gain - dB 60 0 -10 -20 VI = 12 V, VO = 3.3 V, IO = 2.5 A, fS = 700 kHz -30 -60 -30 10 100 1k 10 k 100 k -90 1M f - Frequency - Hz Figure 5. Measured Loop Response, TPS54550, VIN = 12 V 2.
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www.ti.com Test Setup and Results 2.7 Input Voltage Ripple The input voltage ripple is shown in Figure 7. The input voltage is VIN = 12 V for the TPS54550. Output current for each device is at full rate TPS54550EVM-158 load of 5 A. VI(Ripple) = 100 mV/div (ac) coupled V(PH) = 2 V/div VI = 7 V, VO = 3.3 V, IO = 5 A, fS = 700 kHz Figure 7. Input Voltage Ripple, TPS54550 2.8 Powering Up The TPS54550EVM-158 start-up waveforms are shown in Figure 8.
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www.ti.com Board Layout 3 Board Layout This section provides a description of the TPS54550EVM-158 board layout and layer illustrations. 3.1 Layout The board layout for the TPS54550EVM-158 is shown in Figure 9 through Figure 11. The topside layer of the TPS54550EVM-158 is laid out in a manner typical of a user application. The top and bottom layers are 2-oz. copper. The top layer contains the main power traces for VIN, OUT, and VPHASE.
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www.ti.com Board Layout Figure 9.
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www.ti.com Board Layout Figure 10.
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www.ti.com Schematic and Bill of Materials Figure 11. Top-Side Assembly 4 Schematic and Bill of Materials The TPS54550EVM-158 schematic and bill of materials are presented in this section.
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www.ti.com Schematic and Bill of Materials 4.1 Schematic + The schematic for the TPS54550EVM-158 is shown in Figure 12. Figure 12.
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www.ti.com Schematic and Bill of Materials 4.2 Bill of Materials The bill of materials for the TPS54550EVM-158 is given by Table 5. Table 5. TPS54550EVM-158 Bill of Materials Count REF DES Value Description Size Part Number MFR 1210 C3225X5R0J107M TDK 0603 C1608X5R1E104KB TDK Capacitor, Ceramic, 25V, X5R, 10% 0603 C1608X5R1E105KB TDK 0.033 µF Capacitor, Ceramic, 50V, X5R, 10% 0603 C1608X5R1H333KB TDK C6 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.