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User's Guide

SLVU430–January 2011

TPS5401EVM-708 0.5-A, SWIFT™ Regulator Evaluation

Module

This user's guide contains background information for the TPS5401 as well as support documentation for

the TPS5401EVM-708 evaluation module (HPA708). Also included are the performance specifications, the

schematic, and the bill of materials for the TPS5401EVM-708.

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 TPS5401EVM-708 Efficiency.............................................................................................. 4

2 TPS5401EVM-708 Low Current Efficiency .............................................................................. 5

3 TPS5401EVM-708 Load Regulation ..................................................................................... 5

4 TPS5401EVM-708 Line Regulation ...................................................................................... 6

5 TPS5401EVM-708 Transient Response ................................................................................ 6

6 TPS5401EVM-708 Loop Response ..................................................................................... 7

7 TPS5401EVM-708 Output Ripple ........................................................................................ 7

8 TPS5401EVM-708 Input Ripple .......................................................................................... 8

9 TPS5401EVM-708 Start-Up Relative to V

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

10 TPS5401EVM–708 Eco–mode™ Operation ............................................................................ 9

11 TPS5401EVM-708 Top-Side Assembly ................................................................................ 10

12 TPS5401EVM-708 Top-Side Layout.................................................................................... 10

13 TPS5401EVM-708 Bottom-Side Layout................................................................................ 11

14 TPS5401EVM-708 Schematic ........................................................................................... 11

List of Tables

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

2 TPS5401EVM-708 Performance Specification Summary ............................................................. 2

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

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

5 TPS5401EVM-708 Bill of Materials ..................................................................................... 12

SLVU430–January 2011 TPS5401EVM-708 0.5-A, SWIFT™ Regulator Evaluation Module

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Summary of content (14 pages)

PAGE 1
User's Guide SLVU430 – January 2011 TPS5401EVM-708 0.5-A, SWIFT™ Regulator Evaluation Module This user's guide contains background information for the TPS5401 as well as support documentation for the TPS5401EVM-708 evaluation module (HPA708). Also included are the performance specifications, the schematic, and the bill of materials for the TPS5401EVM-708. 1 2 3 4 Contents Introduction ..................................................................................................................
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Introduction 1 www.ti.com Introduction This user's guide contains background information for the TPS5401 as well as support documentation for the TPS5401EVM-708 evaluation module (HPA708). Also included are the performance specifications, the schematic, and the bill of materials for the TPS5401EVM-708. 1.1 Background The TPS5401 dc/dc converter is designed to provide up to a 0.5-A output from an input voltage source of 3.5 V to 42 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 TPS5401. 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. R6 = 10 k W ´ (VOUT - 0.8 V) 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 VOUT, 5 V at 0.5 A maximum TP1 VIN test point at VIN connector TP2 GND test point at VIN TP3 EN test point. Connect EN to ground to disable, open to enable. TP4 Slow start monitor test point TP5 PWRGD test point TP6 PH test point TP7 Output voltage test point at voltage divider. Used for loop response measurements.
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Test Setup and Results www.ti.com 100 90 80 Efficiency - % 70 VIN = 7.5 V 60 VIN = 15 V 50 VIN = 24 V 40 30 VIN = 35 V 20 10 0 0.001 0.01 0.1 1 IOUT - Output Current - A Figure 2. TPS5401EVM-708 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 TPS5401EVM-708 is shown in Figure 3. 0.10 VIN = 24 V 0.
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Test Setup and Results www.ti.com 0.10 IOUT = 0.25 A 0.08 0.06 Regulation - % 0.04 0.02 0.00 −0.02 −0.04 −0.06 −0.08 −0.10 5 10 15 20 25 30 35 VIN - Input Voltage - V Figure 4. TPS5401EVM-708 Line Regulation 2.5 Load Transients The TPS5401EVM-708 response to load transients is shown in Figure 5. The current step is from 25% to 75% of maximum rated load at a 24-V input. Total peak-to-peak voltage variation is as shown, including ripple and noise on the output.
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Test Setup and Results www.ti.com 60 180 40 120 Phase 60 0 0 Gain Phase - ° Gain - dB 20 −20 −60 −40 −120 −60 100 1000 10000 100000 −180 1000000 Frequency - Hz Figure 6. TPS5401EVM-708 Loop Response 2.7 Output Voltage Ripple The TPS5401EVM-708 output voltage ripple is shown in Figure 7 . The output current is the rated full load of 0.5 A and VIN = 24 V. The ripple voltage is measured directly across the output capacitors.
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Test Setup and Results www.ti.com PH = 20 V / div VIN = 100 mV / div (ac coupled) Inductor Current = 100 mA / div Time = 1 µsec / div Figure 8. TPS5401EVM-708 Input Ripple 2.9 Powering Up The start-up waveforms are shown in Figure 9. In Figure 9, the top trace shows VOUT , and the bottom trace shows VIN.
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Board Layout www.ti.com 2.10 Eco-mode™ Operation At light load currents, the TPS5401 is designed to operate in pulse-skipping Eco-mode™ operation. When the COMP pin voltage lowers to 500 mA typical, the device enters Eco-mode™ operation. Figure 10 shows Eco-mode operation; channel 1(C1) shows the switching node (PH) voltage, whereas channel 2(C2) shows the output voltage, and channel 3 (C3) shows the inductor current.
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Board Layout www.ti.com Figure 11. TPS5401EVM-708 Top-Side Assembly Figure 12. TPS5401EVM-708 Top-Side Layout 10 TPS5401EVM-708 0.
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Schematic and Bill of Materials www.ti.com Figure 13. TPS5401EVM-708 Bottom-Side Layout 3.2 Estimated Circuit Area The estimated printed-circuit board area for the components used in this design is 0.743 in2 (526 mm2). This area does not include test point or connectors. 4 Schematic and Bill of Materials This section presents the TPS5401EVM-708 schematic and bill of materials. 4.1 Schematic Figure 14 is the schematic for the TPS5401EVM-708. + + Figure 14.
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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 TPS5401EVM-708. Table 5. TPS5401EVM-708 Bill of Materials Count Size Part Number 0 C1 Open Capacitor, multi pattern, SM 1210 to E case + F THole Multi sizes Engineering Only 2 C2, C3 2.2mF Capacitor, Ceramic, 50V, X7R 1206 GRM31CR71H225KA Murata 88L 1 C4 0.01mF Capacitor, Ceramic, 25V, X5R, 20% 0603 Std Std 1 C5 220mF Capacitor, Al Electrolytic, 10 V, 105 deg.
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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.