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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 ..............................................
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Description www.ti.com List of Tables 1 TPS53125EVM-599 Electrical and Performance Specifications...................................................... 2 2 Test Point Description...................................................................................................... 4 3 TPS53125EVM-599 Bill of Materials.................................................................................... 15 1 Description The TPS53125EVM-599 evaluation board provides the user with a convenient way to
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www.ti.com TPS53125EVM-599 Schematic 3 TPS53125EVM-599 Schematic For Reference Only, See Table x: for Specific Values Figure 1. TPS53125EVM-599 Schematic 3 SLVU392–July 2010 TPS53125EVM-599 Copyright © 2010, Texas Instruments Incorporated + + + + +
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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. 4.2 Test Point Descriptions Table 2 lists the test
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www.ti.com Test Setup 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. TP5 monitors the swi
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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. Because this EVM is not enclosed to allow probing of circuit nodes, a small fan capable of 200
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www.ti.com Test Setup 5.2.2 Test Setup Diagram FAN Oscilloscope 1MW, AC + - 20mV /div V1 20MHz + LOAD1 + 1.05V @ V2 4A - - - LOAD2 - 1.8V @ V3 4A + + A1 V VIN - 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 V from 0 V to 12 Vdc. IN 2. Vary LOAD1 from 0 V – 4 Adc. 3. Vary LOAD2 from 0 V – 4 Adc. 4. Vary V from 8 Vdc to 22 Vdc. IN 5. Decrease V to 0 Vdc. IN 6. Decrease LOAD1 to 0 A
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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 V from 0 V to 12 Vdc. IN 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 V to desired load between 8 Vdc and 22 Vdc. IN 5. Connect oscilloscope probe to CN1 or CN2 shown in Figure 2. 6. Measure Output Ripple. 7. Decrease
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www.ti.com TPS53125EVM-599 Test Data 100 V = 8 V I 90 80 V = 12 V 70 I V = 22 V 60 I 50 40 30 20 10 0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 I - Load Current - A LOAD V = 8 V – 22 V, V = 1.80 V, I = 0 A – 4 A IN OUT2 OUT2 Figure 4. TPS53125EVM-599 Efficiency vs Load Current 6.2 Line and Load Regulation 1.07 1.065 V = 22 V I V = 12 V I 1.06 V = 8 V I 1.055 1.05 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 I - Load Current - A LOAD V = 8 V – 22 V, V = 1.05 V, I = 0 A – 4 A IN OUT1 OUT Figure 5. TPS53125EVM-599 Output Vol
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TPS53125EVM-599 Test Data www.ti.com 1.86 1.855 1.85 1.845 V = 22 V I V = 12 V I 1.84 1.835 V = 8 V I 1.83 1.825 1.82 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 I - Load Current - A LOAD V = 8 V – 22 V, V = 1.80 V, I = 0 A – 4 A IN OUT1 OUT Figure 6. TPS53125EVM-599 Output Voltage vs Load Current 6.3 Output Voltage Ripple and Switching Node Waveforms V = 12, V = 1.05, I = 4 A IN OUT1 OUT1 Figure 7. TPS53125EVM-599 Output Voltage Ripple and Switching Waveform 10 TPS53125EVM-599 SLVU392–July 2010 Copyright © 2
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www.ti.com TPS53125EVM-599 Test Data V = 12, V = 1.80, I = 4 A IN OUT2 OUT2 Figure 8. TPS53125EVM-599 Output Voltage Ripple 6.4 Switch Node tV = 12, V = 1.05, I = 4A, IN OUT1 OUT1 Ch1: TP5 (SW1) Figure 9. TPS53125EVM-599 Switching Waveforms 11 SLVU392–July 2010 TPS53125EVM-599 Copyright © 2010, Texas Instruments Incorporated
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TPS53125EVM-599 Assembly Drawings and Layout www.ti.com V = 12, V = 1.80, I = 4A IN OUT2 OUT2 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 appl
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www.ti.com TPS53125EVM-599 Assembly Drawings and Layout Figure 12. TPS53125EVM-599 Top Copper, Viewed From Top Figure 13. TPS53125EVM-599 Bottom Copper, Viewed From Bottom 13 SLVU392–July 2010 TPS53125EVM-599 Copyright © 2010, Texas Instruments Incorporated
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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. TPS53125EVM-599 Internal 2, X-Ray View From Top 14 TPS53125EVM-599 SLVU392–July 2010 Copyright © 2010, Texas Instruments Incorporated
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www.ti.com TPS53125EVM-599 Bill of Materials 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 RefDes Value Description Size Part Number MFR 0 C1 Capacitor, Aluminum, 25V, 20% 0.328 x 0.390 inch Std S
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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. As such, the goods being provided are not intended to be
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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. All products are sold subject to TI’s terms and conditions of sale supplied at the t
