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User's Guide

SLUU818–April 2012

Using the TPS51219EVM-630 High-Performance,

Single, Synchronous, Step-Down Controller for

Notebook Power Supply

The TPS51219EVM evaluation module (EVM) uses the TPS51219. The TPS51219 is a small-size, single

buck controller with adaptive on-time D-CAP2™ providing 1.05-V output at up to 20 A from input voltage

ranging 8 V to 20 V.

Contents

1 Description ................................................................................................................... 3

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

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

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

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

4 Test Setup ................................................................................................................... 6

4.1 Test Equipment ..................................................................................................... 6

4.2 Recommended Test Setup ....................................................................................... 7

5 Test Procedure .............................................................................................................. 8

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

5.2 List of Test Points .................................................................................................. 8

5.3 Equipment Shutdown .............................................................................................. 8

6 Performance Data and Typical Characteristic Curves ................................................................. 8

6.1 Efficiency ............................................................................................................ 9

6.2 Load Regulation .................................................................................................... 9

6.3 Line Regulation ................................................................................................... 10

6.4 Load Transient .................................................................................................... 10

6.5 Output Ripple ..................................................................................................... 11

6.6 Switch Node Voltage ............................................................................................. 11

6.7 Turnon/Turnoff Waveform ....................................................................................... 12

6.8 Output 0.5-V Prebias Turnon Waveform ...................................................................... 12

7 EVM Assembly Drawing and PCB Layout ............................................................................. 13

8 Bill of Materials ............................................................................................................. 16

List of Figures

1 TPS51219EVM-630 Schematic, Sheet 1 of 2........................................................................... 4

2 TPS51219EVM-630 Schematic, Sheet 2 of 2........................................................................... 5

3 Tip and Barrel Measurement for Switch Node Voltage ................................................................ 6

4 TPS51219EVM-630 Recommended Test Setup ....................................................................... 7

5 TPS51219EVM-630 Efficiency ............................................................................................ 9

6 TPS51219EVM-630 Load Regulation .................................................................................... 9

7 TPS51219EVM-630 Line Regulation ................................................................................... 10

8 TPS51219EVM-630 Load Transient (V

OUT

=1.05 V) ................................................................... 10

9 Output Ripple .............................................................................................................. 11

10 Switching Node Waveform ............................................................................................... 11

11 Enable Turnon ............................................................................................................. 12

SLUU818–April 2012 Using the TPS51219EVM-630 High-Performance, Single, Synchronous,

Step-Down Controller for Notebook Power Supply

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Summary of content (25 pages)

PAGE 1
User's Guide SLUU818 – April 2012 Using the TPS51219EVM-630 High-Performance, Single, Synchronous, Step-Down Controller for Notebook Power Supply The TPS51219EVM evaluation module (EVM) uses the TPS51219. The TPS51219 is a small-size, single buck controller with adaptive on-time D-CAP2™ providing 1.05-V output at up to 20 A from input voltage ranging 8 V to 20 V. 1 2 3 4 5 6 7 8 Contents Description .....................................................................................................
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www.ti.com 12 Enable Turnoff ............................................................................................................. 12 13 Output 0.5-V Prebias Turnon Waveform ............................................................................... 12 14 TPS51219EVM-630 Top Layer Assembly Drawing (Top View) ..................................................... 13 15 TPS51219EVM-630 Bottom Layer Assembly Drawing (Bottom View) .............................................
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Description www.ti.com 1 Description The TPS51219EVM evaluation module (EVM) is designed to use a regulated voltage ranging 8 V to 20 V to produce 1.05-V output at up to 20 A of load current. The TPS51219EVM demonstrates the TPS51219 in a typical low-voltage application with D-CAP2™ mode operation. The EVM also provides test points to evaluate the performance of the TPS51219. 1.1 Typical Applications • • • 1.
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Schematic 3 www.ti.com Schematic Figure 1.
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Schematic www.ti.com Figure 2.
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Test Setup www.ti.com 4 Test Setup 4.1 Test Equipment Voltage Source VIN: The input voltage source VIN must be a 0-V to 20-V variable DC source capable of supplying 10 Adc. Connect VIN to J4 as shown in Figure 4. Voltage Source V5IN: The input voltage source V5IN must be a 0-V to 5-V variable DC source capable of supplying 1 Adc. Connect V5IN to J1 as shown in Figure 4.
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Test Setup www.ti.com 4.2 Recommended Test Setup + A1 DC Source VIN Electronic Load V1 _ _ + J4 TP12 VIN_GND OFF SW1 ON Oscilloscope V3 TP11 VIN TP3 JP2 _ _ + GSNS TP15 VCCIO TP7 SW PGOOD TP8 GND J6 VSNS J12 J13 TP16 VCCIO_GND JP1 + TPS51219 EVM-630 _ V2 TP9 V5IN + J1: V5IN DC Source V5IN TP10 V5IN_GND J2: V5IN_GND + TP6 TP5 GND ILOAD _ A2 FAN Figure 4. TPS51219EVM-630 Recommended Test Setup Figure 4 is the recommended test setup to evaluate the TPS51219EVM.
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Test Procedure www.ti.com 5 Test Procedure 5.1 Line/Load Regulation and Efficiency Measurement Procedure 1. Ensure the load is set to constant resistance mode and to sink 0 Adc. 2. Ensure SW1 on the EVM is at OFF position before VIN and V5IN are applied. 3. Increase VIN from 0 V to 8 V. Use V1 to measure input voltage. 4. Increase V5IN from 0 V to 5 V. Use V2 to measure input voltage. 5. Turn SW1 to ON position to enable the controller. 6.
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Performance Data and Typical Characteristic Curves www.ti.com 6.1 Efficiency 100 VIN = 8 V 90 80 Efficiency (%) 70 VIN = 12 V 60 VIN = 20 V 50 40 30 20 10 0 0.001 0.01 0.1 1 Output Current (A) 10 100 G001 Figure 5. TPS51219EVM-630 Efficiency 6.2 Load Regulation 1.07 1.065 1.06 Output Voltage (V) VIN = 8 V VIN = 20 V 1.055 1.05 VIN = 12 V 1.045 1.04 1.035 1.03 0 2 4 6 8 10 12 14 Output Current (A) 16 18 20 G002 Figure 6.
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Performance Data and Typical Characteristic Curves 6.3 www.ti.com Line Regulation 1.07 1.065 Output Voltage (V) 1.06 1.055 1.05 1.045 1.04 1.035 1.03 6 8 10 12 14 16 Input Voltage (V) 18 20 22 G003 Figure 7. TPS51219EVM-630 Line Regulation 6.4 Load Transient VIN = 20 V VSNS-GSNS (0.5 V/div) Offset: 1.05 V IOUT (8 A/div) Offset: 6 A Figure 8. TPS51219EVM-630 Load Transient (VOUT=1.
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Performance Data and Typical Characteristic Curves www.ti.com 6.5 Output Ripple VIN = 12 V, VOUT = 1.05 V, IOUT = 20 A Figure 9. Output Ripple 6.6 Switch Node Voltage VIN = 12 V, VOUT = 1.05 V, IOUT = 20 A Figure 10.
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Performance Data and Typical Characteristic Curves 6.7 www.ti.com Turnon/Turnoff Waveform IOUT = 15 A IOUT = 15 A EN (5 V/div) EN (5 V/div) VSNS-GSNS (0.5 V/div) VSNS-GSNS (0.5 V/div) 0.5 V Pre-biased PGOOD (5 V/div) PGOOD (5 V/div) Figure 11. Enable Turnon 6.8 Figure 12. Enable Turnoff Output 0.5-V Prebias Turnon Waveform IOUT = 0 A EN (5 V/div) VSNS-GSNS (0.5 V/div) 0.5 V Pre-biased PGOOD (5 V/div) Figure 13. Output 0.
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EVM Assembly Drawing and PCB Layout www.ti.com 7 EVM Assembly Drawing and PCB Layout The following figures (Figure 15 through Figure 19) show the design of the TPS51219EVM-630 printedcircuit board (PCB). The EVM has been designed using four-layer, 2-oz copper circuit board. Figure 14. TPS51219EVM-630 Top Layer Assembly Drawing (Top View) Figure 15.
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EVM Assembly Drawing and PCB Layout www.ti.com Figure 16. TPS51219EVM-630 Top Copper Layer (Top View) Figure 17.
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EVM Assembly Drawing and PCB Layout www.ti.com Figure 18. TPS51219EVM-630 Internal Layer 2 (Top View) Figure 19.
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Bill of Materials 8 www.ti.com Bill of Materials Table 3. EVM Components List According to Schematic Shown in Figure 1 QTY REFDES DESCRIPTION PART NUMBER MFR 7 C1, C4, C27, C29, C30, 0.1 µF C31, C37 Capacitor, Ceramic, 50 V, X5R, 10% STD STD 1 C3 10 nF Capacitor, Ceramic, 50 V, X5R, 10% STD STD 1 C5 2.
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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.
PAGE 22
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 23
【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.