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User's Guide

SLVU728–May 2012

High Efficiency 14A Synchronous Buck Converter with

Eco-Mode™

The TPS53319EVM-136 is designed to use a regulated 12V bus to produce a regulated 1.5V output at up

to 14A of load current. The TPS53319EVM-136 is designed to demonstrate the TPS53319 in a typical low

voltage application while providing a number of test points to evaluate the performance of the TPS53319.

Contents

1 Introduction .................................................................................................................. 3

1.1 Typical Applications ................................................................................................ 3

1.2 Features ............................................................................................................. 3

2 Electrical Performance Specifications .................................................................................... 3

3 Schematic .................................................................................................................... 4

4 Test Setup ................................................................................................................... 5

4.1 Test Equipment ..................................................................................................... 5

4.2 Recommended Test Setup ....................................................................................... 6

5 Configurations ............................................................................................................... 6

5.1 Switching Frequency Selection .................................................................................. 6

5.2 Soft Start Selection ................................................................................................ 7

5.3 Mode Selection ..................................................................................................... 7

5.4 Enable Selection ................................................................................................... 7

6 Test Procedure .............................................................................................................. 8

6.1 Line/Load Regulation and Efficiency Measurement Procedure .............................................. 8

6.2 Control Loop Gain and Phase Measurement Procedure ..................................................... 8

6.3 List of Test Points .................................................................................................. 8

6.4 Equipment Shutdown .............................................................................................. 9

7 Performance Data and Typical Characteristic Curves ................................................................. 9

7.1 Efficiency ............................................................................................................ 9

7.2 Load Regulation .................................................................................................. 10

7.3 Line Regulation ................................................................................................... 10

7.4 Enable Turn on/ Turn off ........................................................................................ 11

7.5 Output Ripple ..................................................................................................... 11

7.6 Switching Node ................................................................................................... 12

7.7 Output Transient with Auto-skip mode ......................................................................... 12

7.8 Output Transient with FCCM mode ............................................................................ 13

7.9 Output 0.75V Pre-bias Turn on ................................................................................. 13

7.10 Output Over Current and Short Circuit Protection ........................................................... 13

7.11 Bode plot ........................................................................................................... 14

7.12 Thermal Image .................................................................................................... 15

8 EVM Assembly Drawing and PCB Layout ............................................................................. 16

9 Bill of Materials ............................................................................................................. 24

List of Figures

1 TPS53319EVM-136 Schematic ........................................................................................... 4

2 Tip and Barrel Measurement for Vout Ripple ........................................................................... 5

3 TPS53319EVM-136 Recommended Test Set Up ...................................................................... 6

4 Efficiency..................................................................................................................... 9

SLVU728–May 2012 High Efficiency 14A Synchronous Buck Converter with Eco-Mode™

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Summary of content (33 pages)

PAGE 1
User's Guide SLVU728 – May 2012 High Efficiency 14A Synchronous Buck Converter with Eco-Mode™ The TPS53319EVM-136 is designed to use a regulated 12V bus to produce a regulated 1.5V output at up to 14A of load current. The TPS53319EVM-136 is designed to demonstrate the TPS53319 in a typical low voltage application while providing a number of test points to evaluate the performance of the TPS53319. 1 2 3 4 5 6 7 8 9 Contents Introduction ...............................................................
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www.ti.com 5 Load Regulation ........................................................................................................... 10 6 Line Regulation ............................................................................................................ 10 7 Enable Turn on 11 8 Enable Turn off 11 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 ............................................................................................................ ...........................
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Introduction www.ti.com 1 Introduction The TPS53319EVM-136 evaluation module (EVM) uses the TPS53319. The TPS53319 is a D-CAP™ mode, 14A synchronous Buck converter with integrated MOSFETs. It provides a fixed 1.5V output at up to 14A from a 12V input bus. 1.1 Typical Applications • • • 1.
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Schematic 3 www.ti.com Schematic Figure 1.
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Test Setup www.ti.com 4 Test Setup 4.1 Test Equipment Voltage Source: The input voltage source Vin should be a 0-20V variable DC source capable of supplying 10Adc. Connect Vin to J1 as shown in Figure 3. Multimeters: V1: Vin at TP1 (Vin) and TP10 (GND). V2: Vout at TP2 (Vout) and TP11 (GND). A1: Vin input current Output Load: The output load should be an electronic constant resistance mode load capable of 0-16Adc at 1.5V.
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Configurations 4.2 www.ti.com Recommended Test Setup + DC + Source Vin - V1 V2 Load - A1 Figure 3. TPS53319EVM-136 Recommended Test Set Up Figure 3 is the recommended test set up to evaluate the TPS53319EVM-136. Working at an ESD workstation, make sure that any wrist straps, bootstraps or mats are connected referencing the user to earth ground before power is applied to the EVM. Input Connections: 1.
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Configurations www.ti.com Table 2. Switching Frequency Selection Jumper set to Resistor (RF) Connections(Ω) Switching Frequency(kHz) Top(1-2 pin shorted) 0 250 2nd (3-4 pin shorted) 187k 300 3rd(5-6 pin shorted) 619k 400 4 (7-8 pin shorted) Open 500 5th(9-10 pin shorted) 866k 600 6th(11-12 pin shorted) 309k 750 7th(13-14 pin shorted) 124k 850 Bottom(15-16 pin shorted) 0 970 th 5.2 Soft Start Selection The soft start time can be set by J4. Default setting: 1.4ms Table 3.
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Test Procedure www.ti.com 6 Test Procedure 6.1 Line/Load Regulation and Efficiency Measurement Procedure 1. Set up EVM as described in Section 4 and Figure 3. 2. Ensure Load is set to constant resistance mode and to sink 0Adc 3. Ensure all jumpers configuration settings per section 5. 4. Ensure the jumper provided in the EVM shorts on J6 before Vin is applied. 5. Increase Vin from 0V to 12V. Using V1 to measure input voltage. 6. Remove the jumper on J6 to enable the controller. 7.
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www.ti.com 6.4 Performance Data and Typical Characteristic Curves Equipment Shutdown 1. Shut down Load 2. Shut down Vin 7 Performance Data and Typical Characteristic Curves Figure 4 through Figure 18 present typical performance curves for TPS53319EVM-136. 7.1 Efficiency Figure 4.
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Performance Data and Typical Characteristic Curves 7.2 www.ti.com Load Regulation Figure 5. Load Regulation 7.3 Line Regulation Figure 6.
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Performance Data and Typical Characteristic Curves www.ti.com 7.4 Enable Turn on/ Turn off Figure 7. Enable Turn on 7.5 Figure 8. Enable Turn off Output Ripple Figure 9.
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Performance Data and Typical Characteristic Curves 7.6 www.ti.com Switching Node Figure 10. Switching Node 7.7 Output Transient with Auto-skip mode Figure 11. Output Transient from DCM to CCM 12 Figure 12.
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Performance Data and Typical Characteristic Curves www.ti.com 7.8 Output Transient with FCCM mode Figure 13. Output Transient with FCCM mode 7.9 Output 0.75V Pre-bias Turn on Figure 14. Output 0.75V Pre-bias Turn on 7.
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Performance Data and Typical Characteristic Curves Figure 15. Output Over Current Protection www.ti.com Figure 16. Output Over Voltage Protection 7.11 Bode plot Figure 17. Bode plot at 12Vin, 1.
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Performance Data and Typical Characteristic Curves www.ti.com 7.12 Thermal Image Figure 18. Top Board at 12Vin, 1.5V/14A, 25deg.C amb.
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EVM Assembly Drawing and PCB Layout 8 www.ti.com EVM Assembly Drawing and PCB Layout The following figures (Figure 19 through Figure 26) show the design of the TPS53319EVM-136 printed circuit board. The EVM has been designed using a 6 Layer, 2 oz copper circuit board. Figure 19.
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EVM Assembly Drawing and PCB Layout www.ti.com Figure 20.
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EVM Assembly Drawing and PCB Layout www.ti.com Figure 21.
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EVM Assembly Drawing and PCB Layout www.ti.com Figure 22.
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EVM Assembly Drawing and PCB Layout www.ti.com Figure 23.
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EVM Assembly Drawing and PCB Layout www.ti.com Figure 24.
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EVM Assembly Drawing and PCB Layout www.ti.com Figure 25.
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EVM Assembly Drawing and PCB Layout www.ti.com Figure 26.
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Bill of Materials 9 www.ti.com Bill of Materials Table 7 list the EVM components according to the schematic shown in Figure 1. Table 7. Complonents List QTY. RefDes Description MFR Part Number 2 C1, C2 Capacitor, Ceramic, 22uF, 25V, X5R, 20%, 1210 STD STD 3 C7, C8, C9 Capacitor, Ceramic, 100uF, 6.3V, X5R, 20%, 1210 STD STD 1 C13 Capacitor, Ceramic, 4.
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EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following conditions: The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims arising from the handling or use of the goods.
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FCC Interference Statement for Class B EVM devices This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.
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【Important Notice for Users of this Product in Japan】】 This development kit is NOT certified as Confirming to Technical Regulations of Radio Law of Japan If you use this product in Japan, you are required by Radio Law of Japan to follow the instructions below with respect to this product: 1. 2. 3. Use this product in a shielded room or any other test facility as defined in the notification #173 issued by Ministry of Internal Affairs and Communications on March 28, 2006, based on Sub-section 1.
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EVALUATION BOARD/KIT/MODULE (EVM) WARNINGS, RESTRICTIONS AND DISCLAIMERS For Feasibility Evaluation Only, in Laboratory/Development Environments. Unless otherwise indicated, this EVM is not a finished electrical equipment and not intended for consumer use.
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EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following conditions: The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims arising from the handling or use of the goods.
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FCC Interference Statement for Class B EVM devices This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.
PAGE 31
【Important Notice for Users of this Product in Japan】】 This development kit is NOT certified as Confirming to Technical Regulations of Radio Law of Japan If you use this product in Japan, you are required by Radio Law of Japan to follow the instructions below with respect to this product: 1. 2. 3. Use this product in a shielded room or any other test facility as defined in the notification #173 issued by Ministry of Internal Affairs and Communications on March 28, 2006, based on Sub-section 1.
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EVALUATION BOARD/KIT/MODULE (EVM) WARNINGS, RESTRICTIONS AND DISCLAIMERS For Feasibility Evaluation Only, in Laboratory/Development Environments. Unless otherwise indicated, this EVM is not a finished electrical equipment and not intended for consumer use.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.