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User's Guide

SLVU372–March 2009

TPS54260EVM-597 2.5-A, SWIFT™ Regulator Evaluation

Module

This user's guide contains information for the TPS54260EVM-597 evaluation module (HPA597). Included

are the performance specifications, the schematic, and the bill of materials for the TPS54260EVM-597.

Contents

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

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

3 Board Layout ............................................................................................................... 10

4 Schematic and Bill of Materials .......................................................................................... 12

List of Figures

1 TPS54260EVM-597 Efficiency ............................................................................................ 4

2 TPS54260EVM-597 Low Current Efficiency............................................................................. 5

3 TPS54260EVM-597 Load Regulation .................................................................................... 5

4 TPS54260EVM-597 Line Regulation..................................................................................... 6

5 TPS54260EVM-597 Transient Response ............................................................................... 6

6 TPS54260EVM-597 Loop Response .................................................................................... 7

7 TPS54260EVM-597 Output Ripple ...................................................................................... 7

8 TPS54260EVM-597 Input Ripple ......................................................................................... 8

9 TPS54260EVM-597 Start-Up Relative to V

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

10 Continuous Conduction Mode Operation ................................................................................ 9

11 Discontinuous Conduction Mode Operation............................................................................. 9

12 TPS54260EVM–415 Eco–mode™ Operation ......................................................................... 10

13 TPS54260EVM-597 Top-Side Assembly............................................................................... 11

14 TPS54260EVM-597 Top-Side Layout .................................................................................. 11

15 TPS54260EVM-597 Bottom-Side Layout .............................................................................. 12

16 TPS54260EVM-597 Schematic.......................................................................................... 13

List of Tables

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

2 TPS54260EVM-597 Performance Specification Summary............................................................ 2

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

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

5 Bill of Materials ............................................................................................................ 14

SWIFT, Eco-mode are trademarks of Texas Instruments.

SLVU372–March 2009 TPS54260EVM-597 2.5-A, SWIFT™ Regulator Evaluation Module

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Summary of content (16 pages)

PAGE 1
User's Guide SLVU372 – March 2009 TPS54260EVM-597 2.5-A, SWIFT™ Regulator Evaluation Module This user's guide contains information for the TPS54260EVM-597 evaluation module (HPA597). Included are the performance specifications, the schematic, and the bill of materials for the TPS54260EVM-597. 1 2 3 4 Contents Introduction .................................................................................................................. 2 Test Setup and Results ............................................
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Introduction 1 www.ti.com Introduction This user's guide contains background information for the TPS54260 as well as support documentation for the TPS54260EVM-597 evaluation module (HPA597). Also included are the performance specifications, the schematic, and the bill of materials for the TPS54260EVM-597. 1.1 Background The TPS54260 dc/dc converter is designed to provide up to a 2.5-A output from an input voltage source of 3.5 V to 60 V.
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Test Setup and Results www.ti.com Table 2. TPS54260EVM-597 Performance Specification Summary (continued) SPECIFICATION TEST CONDITIONS Operating frequency 1.3 MIN TYP MAX UNIT 300 kHz Maximum efficiency TPS54260EVM-597, VIN = 12 V, IO = 0.8 A CCM/DCM boundary VIN = 12 V, 87.1% 0.337 Eco-mode™ threshold VIN = 12 V 5 mA No load input current (switching) VIN = 12 V 392 µA A Modifications These evaluation modules are designed to provide access to the features of the TPS54260.
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Test Setup and Results 2.1 www.ti.com Input/Output Connections The TPS54260EVM-597 is provided with input/output connectors and test points as shown in Table 4. A power supply capable of supplying 1.5 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 must be 2.5 A. Wire lengths must be minimized to reduce losses in the wires.
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Test Setup and Results www.ti.com Figure 2 shows the efficiency for the TPS54260EVM-597 at lower output currents between 0.001 A and 0.1 A at an ambient temperature of 25°C. EFFICIENCY - Vin = 12 V 100 90 80 Efficiency - % 70 60 50 40 30 20 10 0 0.001 0.01 0.1 1 10 Output Current - A Figure 2. TPS54260EVM-597 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.
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Test Setup and Results 2.4 www.ti.com Output Voltage Line Regulation The line regulation for the TPS54260EVM-597 is shown in Figure 4. LINE REGULATION - Iout = 1.2 A 0.2 Output Voltage Deviation - % 0.15 0.1 0.05 0 -0.05 -0.1 -0.15 -0.2 10.8 11.2 11.6 12 12.4 12.8 13.2 Input Voltage - V Figure 4. TPS54260EVM-597 Line Regulation 2.5 Load Transients The TPS54260EVM-597 response to load transients is shown in Figure 5. The current step is from 1.5 A to 2.5 A . The input voltage is 12 V.
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Test Setup and Results www.ti.com 2.6 Loop Characteristics The TPS54260EVM-597 loop-response characteristics are shown in Figure 6 . Gain and phase plots are shown for VIN voltage of 12V. Load current for the measurement is 2.5 A. 60 180 50 150 40 120 30 90 20 60 10 30 0 0 -10 -30 -20 -60 -30 Phase - Degrees Gain - dB Closed Loop Response -90 -40 Gain -120 -50 Phase -150 -60 10 100 1000 10000 100000 -180 1000000 Frequency - Hz Figure 6.
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Test Setup and Results 2.8 www.ti.com Input Voltage Ripple The TPS54260EVM-597 input voltage ripple is shown in Figure 8 . The output current is the rated full load of 2.5 A and VIN = 12 V. The ripple voltage is measured directly across the input capacitors. Vin = 200 mV / div (ac coupled) PH = 5 V / div Time = 2 usec /div Figure 8. TPS54260EVM-597 Input Ripple 2.9 Powering Up The start-up waveforms are shown in Figure 9. Start-up is relative to VIN rising.
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Test Setup and Results www.ti.com 2.10 Continuous Conduction Mode Operation When the output current is greater than one half the peak to peak inductor current, the circuit is operating in continuous conduction mode (CCM). The output voltage, PH node voltage and inductor current for CCM is shown in Figure 10. Vout = 2 V / div PH = 10 V / div Inductor Current = 500 mA / div Time = 2 usec / div Figure 10. Continuous Conduction Mode Operation 2.
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Board Layout 2.12 www.ti.com Eco-mode™ Operation At light load currents, the TPS54260 is designed to operate in the pulse-skipping Eco-mode™ operation. When the COMP pin voltage lowers to 500 mA typical, the device enters the Eco-mode™ operation. The output voltage, PH node voltage and inductor current for Eco-mode™ is shown inFigure 12. Vout = 2 V / div PH = 10 V / div Inductor Current = 500 mA / div Time = 2 usec / div Figure 12.
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Board Layout www.ti.com Figure 13. TPS54260EVM-597 Top-Side Assembly Figure 14. TPS54260EVM-597 Top-Side Layout SLVU372 – March 2009 Submit Documentation Feedback TPS54260EVM-597 2.
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Schematic and Bill of Materials www.ti.com Figure 15. TPS54260EVM-597 Bottom-Side Layout 3.2 Estimated Circuit Area The estimated printed-circuit board area for the components used in this design is 0.72 in2. This area does not include test points or connectors. 4 Schematic and Bill of Materials This section presents the TPS54260EVM-597 schematic and bill of materials. 12 TPS54260EVM-597 2.
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Schematic and Bill of Materials www.ti.com 4.1 Schematic + Figure 16 is the schematic for the TPS54260EVM-597. Figure 16. TPS54260EVM-597 Schematic SLVU372 – March 2009 Submit Documentation Feedback TPS54260EVM-597 2.
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Schematic and Bill of Materials 4.2 www.ti.com Bill of Materials Table 5 presents the bill of materials for the TPS54260EVM-597. Table 5. Bill of Materials Count Value Description Size Part Number MFR C1 open Capacitor, multi pattern, SM 1210 to E case + F THole Multi sizes Engineering Only Std 2 C2, C3 2.2uF Capacitor, Ceramic, 100V, X7R, 10% 1210 Std Std 1 C4 0.01uF Capacitor, Ceramic, 25V, X5R, 20% 0603 Std Std 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.