Power Supply User Manual

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User's Guide

SLVU392–July 2010

TPS53125EVM-599

The TPS53125EVM-599 Evaluation Module presents an easy-to-use reference design for a common dual

output power supply using the TPS53125 controller in cost-sensitive applications. Also included are the

schematic, board layout, and bill of materials.

Contents

1 Description ................................................................................................................... 2

1.1 Applications ......................................................................................................... 2

1.2 Features ............................................................................................................. 2

2 TPS53125EVM-599 Electrical Performance Specifications ........................................................... 2

3 TPS53125EVM-599 Schematic ........................................................................................... 3

4 Connector and Test Point Descriptions .................................................................................. 4

4.1 Enable Jumpers/Switches –SW1 and SW2 .................................................................... 4

4.2 Test Point Descriptions ............................................................................................ 4

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

5.1 Equipment ........................................................................................................... 5

5.2 Equipment Setup ................................................................................................... 6

5.3 Start-Up/Shutdown Procedures .................................................................................. 7

5.4 Output Ripple Voltage Measurement Procedure .............................................................. 8

5.5 Equipment Shutdown .............................................................................................. 8

6 TPS53125EVM-599 Test Data ............................................................................................ 8

6.1 Efficiency ............................................................................................................ 8

6.2 Line and Load Regulation ......................................................................................... 9

6.3 Output Voltage Ripple and Switching Node Waveforms .................................................... 10

6.4 Switch Node ....................................................................................................... 11

7 TPS53125EVM-599 Assembly Drawings and Layout ................................................................ 12

8 TPS53125EVM-599 Bill of Materials .................................................................................... 15

List of Figures

1 TPS53125EVM-599 Schematic ........................................................................................... 3

2 TPS53125EVM-599 Recommended Test Setup ....................................................................... 7

3 TPS53125EVM-599 Efficiency vs Load Current ........................................................................ 8

4 TPS53125EVM-599 Efficiency vs Load Current ........................................................................ 9

5 TPS53125EVM-599 Output Voltage vs Load Current ................................................................. 9

6 TPS53125EVM-599 Output Voltage vs Load Current ................................................................ 10

7 TPS53125EVM-599 Output Voltage Ripple and Switching Waveform............................................. 10

8 TPS53125EVM-599 Output Voltage Ripple............................................................................ 11

9 TPS53125EVM-599 Switching Waveforms ............................................................................ 11

10 TPS53125EVM-599 Switching Waveforms ............................................................................ 12

11 TPS53125EVM-599 Component Placement, Viewed From Top.................................................... 12

12 TPS53125EVM-599 Top Copper, Viewed From Top ................................................................. 13

13 TPS53125EVM-599 Bottom Copper, Viewed From Bottom ......................................................... 13

14 TPS53125EVM-599 Internal 1, X-Ray View From Top............................................................... 14

15 TPS53125EVM-599 Internal 2, X-Ray View From Top............................................................... 14

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SLVU392–July 2010 TPS53125EVM-599

Summary of content (17 pages)

PAGE 1
User's Guide SLVU392 – July 2010 TPS53125EVM-599 The TPS53125EVM-599 Evaluation Module presents an easy-to-use reference design for a common dual output power supply using the TPS53125 controller in cost-sensitive applications. Also included are the schematic, board layout, and bill of materials. 1 2 3 4 5 6 7 8 Contents Description ................................................................................................................... 2 1.1 Applications ..................................
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Description www.ti.com List of Tables 1 1 TPS53125EVM-599 Electrical and Performance Specifications ...................................................... 2 2 Test Point Description ...................................................................................................... 4 3 TPS53125EVM-599 Bill of Materials ....................................................................................
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TPS53125EVM-599 Schematic www.ti.com TPS53125EVM-599 Schematic + + + + + 3 For Reference Only, See Table x: for Specific Values Figure 1.
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Connector and Test Point Descriptions www.ti.com 4 Connector and Test Point Descriptions 4.1 Enable Jumpers/Switches –SW1 and SW2 The TPS53125EVM-599 board includes independent enable switches for each of the two outputs. When the switch is in the DIS position, the channel is disabled and discharged per the TPS53125’s internal discharge characteristics. To enable VOUT1, place SW1 in the EN position. To enable VOUT2, place SW2 in the EN position. 4.
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Test Setup www.ti.com 4.2.4 Soft-Start Voltage Monitoring – TP1, TP2, and TP3 TPS53125EVM-599 provides two test points for measuring the soft-start ramp voltages. TP1 monitors the soft-start ramp of Channel 1. TP2 monitors the soft-start ramp of Channel 2. To use TP1 or TP2, connect an oscilloscope probe between TP1 or TP2 and TP3. 4.2.5 Switching Node Monitoring – TP3, TP5, and TP11 TPS53125EVM-599 provides two test points for measuring the switching node waveform voltages.
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Test Setup www.ti.com J1 to LOAD1 and J2 to LOAD2 - The connection between J1 and LOAD1 and J2 and LOAD2 of TPS53125EVM-599 can carry as much as 4 Adc each. The minimum recommended wire size is AWG #14, with the total length of wire less than 2 feet (1-foot input, 1-foot return). 5.1.6 Other Test Equipment Fan – The TPS53125EVM-599 Evaluation Module includes components that can become hot to the touch.
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Test Setup www.ti.com 5.2.2 Test Setup Diagram FAN Oscilloscope + V1 1MW, AC 20mV / div 20MHz - + - + + A1 - + LOAD1 1.05V @ 4A V2 LOAD2 1.8V @ 4A V3 - + VVIN Figure 2. TPS53125EVM-599 Recommended Test Setup 5.3 Start-Up/Shutdown Procedures Perform the start-up and shutdown procedures in the following manner. 1. Increase VIN from 0 V to 12 Vdc. 2. Vary LOAD1 from 0 V – 4 Adc. 3. Vary LOAD2 from 0 V – 4 Adc. 4. Vary VIN from 8 Vdc to 22 Vdc. 5. Decrease VIN to 0 Vdc. 6.
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TPS53125EVM-599 Test Data www.ti.com 7. Decrease LOAD2 to 0 A. 5.4 Output Ripple Voltage Measurement Procedure Perform the Output Ripple Voltage Measurement procedure in the following manner. 1. Increase VIN from 0 V to 12 Vdc. 2. Adjust LOAD1 to desired load between 0 Adc and 4 Adc. 3. Adjust LOAD2 to desired load between 0 Adc and 4 Adc. 4. Adjust VIN to desired load between 8 Vdc and 22 Vdc. 5. Connect oscilloscope probe to CN1 or CN2 shown in Figure 2. 6. Measure Output Ripple. 7.
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TPS53125EVM-599 Test Data www.ti.com 100 VI = 8 V 90 h - Efficiency - % 80 VI = 12 V 70 VI = 22 V 60 50 40 30 20 10 0 0 0.5 1 1.5 2 2.5 3 ILOAD - Load Current - A 3.5 4 4.5 VIN = 8 V – 22 V, VOUT2 = 1.80 V, IOUT2 = 0 A – 4 A Figure 4. TPS53125EVM-599 Efficiency vs Load Current 6.2 Line and Load Regulation 1.07 VO - Output Voltage - V 1.065 VI = 22 V VI = 12 V 1.06 VI = 8 V 1.055 1.05 0 0.5 1 1.5 2 2.5 3 ILOAD - Load Current - A 3.5 4 4.5 VIN = 8 V – 22 V, VOUT1 = 1.
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TPS53125EVM-599 Test Data www.ti.com 1.86 1.855 VO - Output Voltage - V 1.85 1.845 VI = 22 V VI = 12 V 1.84 1.835 VI = 8 V 1.83 1.825 1.82 0 0.5 1 1.5 2 2.5 3 ILOAD - Load Current - A 3.5 4 4.5 VIN = 8 V – 22 V, VOUT1 = 1.80 V, IOUT = 0 A – 4 A Figure 6. TPS53125EVM-599 Output Voltage vs Load Current 6.3 Output Voltage Ripple and Switching Node Waveforms VIN = 12, VOUT1 = 1.05, IOUT1 = 4 A Figure 7.
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TPS53125EVM-599 Test Data www.ti.com VIN = 12, VOUT2 = 1.80, IOUT2 = 4 A Figure 8. TPS53125EVM-599 Output Voltage Ripple 6.4 Switch Node tVIN = 12, VOUT1 = 1.05, IOUT1 = 4A, Ch1: TP5 (SW1) Figure 9.
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TPS53125EVM-599 Assembly Drawings and Layout www.ti.com VIN = 12, VOUT2 = 1.80, IOUT2 = 4A Ch1: TP11 (SW2) Figure 10. TPS53125EVM-599 Switching Waveforms 7 TPS53125EVM-599 Assembly Drawings and Layout The following figures (Figure 11 through Figure 15) show the design of the TPS53125EVM-599 printed-circuit board. The EVM has been designed using a 4-layer, 2-oz copper-clad circuit board 3.5 in 2.7 to allow the user to easily view, probe, and evaluate the TPS53125 control IC in a practical application.
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www.ti.com TPS53125EVM-599 Assembly Drawings and Layout Figure 12. TPS53125EVM-599 Top Copper, Viewed From Top Figure 13.
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TPS53125EVM-599 Assembly Drawings and Layout www.ti.com Figure 14. TPS53125EVM-599 Internal 1, X-Ray View From Top Figure 15.
PAGE 15
TPS53125EVM-599 Bill of Materials www.ti.com 8 TPS53125EVM-599 Bill of Materials The Table 3 contains the bill of materials for TPS53125EVM-599. The reference designators reference the schematic in Figure 1 and assembly locations in Figure 11. The components listed with a quantity of 0 are not populated on the PCB but are provided for reference. Table 3. TPS53125EVM-599 Bill of Materials QTY Description Size Part Number MFR 0 RefDes C1 Value Capacitor, Aluminum, 25V, 20% 0.328 x 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.