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User's Guide

SLVU377–May 2010

TPS54319EVM-626 3-A, SWIFT™ Regulator Evaluation

Module

This user's guide contains information for the TPS54319EVM-626 evaluation module (HPA597). Included

are the performance specifications, the schematic, and the bill of materials for the TPS54319EVM-626.

Contents

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

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

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

4 Schematic and Bill of Materials .......................................................................................... 13

List of Figures

1 TPS54319EVM-626 Efficiency ............................................................................................ 4

2 TPS54319EVM-626 Low Current Efficiency............................................................................. 5

3 TPS54319EVM-626 Load Regulation .................................................................................... 5

4 TPS54319EVM-626 Line Regulation..................................................................................... 6

5 TPS54319EVM-626 Transient Response ............................................................................... 6

6 TPS54319EVM-626 Loop Response .................................................................................... 7

7 TPS54319EVM-626 Output Ripple ...................................................................................... 7

8 TPS54319EVM-626 Input Ripple ......................................................................................... 8

9 TPS54319EVM-626 Start-Up Relative to V

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

10 TPS54319EVM-626 Start-Up Relative to EN ........................................................................... 9

11 TPS54319EVM-626 Top-Side Assembly............................................................................... 10

12 TPS54319EVM-626 Top-Side Layout .................................................................................. 10

13 Internal Layer 1 ............................................................................................................ 11

14 Internal Layer 2 ............................................................................................................ 11

15 TPS54319EVM-626 Bottom-Side Layout .............................................................................. 12

16 TPS54319EVM-626 Schematic.......................................................................................... 13

List of Tables

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

2 TPS54319EVM-626 Performance Specification Summary............................................................ 2

3 Common Output Voltages ................................................................................................. 3

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

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

SWIFT is a trademark of Texas Instruments.

SLVU377–May 2010 TPS54319EVM-626 3-A, SWIFT™ Regulator Evaluation Module

Summary of content (16 pages)

PAGE 1
User's Guide SLVU377 – May 2010 TPS54319EVM-626 3-A, SWIFT™ Regulator Evaluation Module This user's guide contains information for the TPS54319EVM-626 evaluation module (HPA597). Included are the performance specifications, the schematic, and the bill of materials for the TPS54319EVM-626. 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 TPS54319 as well as support documentation for the TPS54319EVM-626 evaluation module (HPA597). Also included are the performance specifications, the schematic, and the bill of materials for the TPS54319EVM-626. 1.1 Background The TPS54319 dc/dc converter is designed to provide up to a 3-A output from an input voltage source of 2.95 V to 6 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 TPS54319. Some modifications can be made to this module. 1.3.1 Output Voltage Set Point The voltage divider of R6 and R7 is used to set the output voltage of the EVM. The 51.1 Ω resistor R8 is provided as an aid to check the loop response of the circuit. To change the output voltage of the EVM, it is necessary to change the value of resistor R6.
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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, 1.8 V at 3 A maximum. JP1 Jumper for ENABLE function. Install jumper for disable. Open for enable. JP2 Jumper for PWRGD pull up. Install jumper to pull PWRGD to VIN through 100 kΩ. TP1 VIN test point at VIN connector. TP2 GND test point at VIN. TP3 PH test point EN test point. Connect EN to ground to disable, open to enable.
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Test Setup and Results www.ti.com Figure 2 shows the efficiency for the TPS54319EVM-626 at lower output currents between 0.001 A and 3 A at an ambient temperature of 25°C. EFFICIENCY 100 90 80 Efficiency - % 70 60 50 40 30 20 Vin = 3.3 V 10 Vin = 5 V 0 0.001 0.01 0.1 1 10 Output Current - A Figure 2. TPS54319EVM-626 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 TPS54319EVM-626 is shown in Figure 4. LINE REGULATION - Iout = 1.5 A 0.4 Output Voltage Deviation - % 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 3 3.5 4 4.5 5 5.5 6 Input Voltage - V Figure 4. TPS54319EVM-626 Line Regulation 2.5 Load Transients The TPS54319EVM-626 response to load transients is shown in Figure 5. The current step is from 0 A to 1.5 A . The input voltage is 5 V.
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Test Setup and Results www.ti.com 2.6 Loop Characteristics The TPS54319EVM-626 loop-response characteristics are shown in Figure 6 . Gain and phase plots are shown for VIN voltage of 5 V. Load current for the measurement is 3 A. 60 180 50 150 40 120 30 90 20 60 10 30 0 0 -10 -30 -20 -60 -30 -90 -40 Gain -120 -50 Phase -150 -60 10 100 1000 10000 100000 Phase - Degrees Gain - dB Closed Loop Response -180 1000000 Frequency - Hz Figure 6. TPS54319EVM-626 Loop Response 2.
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Test Setup and Results 2.8 www.ti.com Input Voltage Ripple The TPS54319EVM-626 input voltage ripple is shown in Figure 8 . The output current is the rated full load of 3 A and VIN = 5 V. The ripple voltage is measured directly across the input capacitors. Vin = 100 mV / div (ac coupled) PH = 2 V / div Time = 500 nsec / div Figure 8. TPS54319EVM-626 Input Ripple 2.9 2.9.1 Powering Up Power Up Relative to VIN The start-up waveform shown in Figure 9 shows start-up is relative to VIN rising.
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Board Layout www.ti.com 2.9.2 Power Up Relative to EN The start-up waveform shown in Figure 10shows start-up is relative to EN rising. The input voltage is initially applied and allowed to reach 5V while EN is held low by installing a jumper across JP1. When the jumper is removed, the device is enabled and the start-up sequence begins. The output ramps up at the externally set rate toward the set value of 1.8 V. The input voltage for this plot is 5 V with a 2 Ω load.
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Board Layout www.ti.com Figure 11. TPS54319EVM-626 Top-Side Assembly Figure 12.
PAGE 11
Board Layout www.ti.com Figure 13. Internal Layer 1 Figure 14.
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Board Layout www.ti.com Figure 15. TPS54319EVM-626 Bottom-Side Layout 3.2 Estimated Circuit Area The estimated printed-circuit board area for the components used in this design is 0.32 in2. This area does not include test points or connectors.
PAGE 13
Schematic and Bill of Materials www.ti.com 4 Schematic and Bill of Materials This section presents the TPS54319EVM-626 schematic and bill of materials. 4.1 Schematic Figure 16 is the schematic for the TPS54319EVM-626. Figure 16.
PAGE 14
Schematic and Bill of Materials 4.2 www.ti.com Bill of Materials Table 5 presents the bill of materials for the TPS54319EVM-626. 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 1 C2 10uF Capacitor, Ceramic, 10V, X5R, 20% 1206 Std Std 1 C3, 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.