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Summary of Contents for Texas Instruments TPS54614EVM
- Page 1 TPS54614EVM, 1.8 V Swift Regulator Evaluation Module User’s Guide September 2001 PMP PD & PS SLVU053...
- Page 2 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.
- Page 3 EVM IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided may not be complete in terms...
- Page 4 EVM schematic located in the EVM User’s Guide. When placing measurement probes near these devices during operation, please be aware that these devices may be very warm to the touch. Mailing Address: Texas Instruments Post Office Box 655303 Dallas, Texas 75265 Copyright 2001, Texas Instruments Incorporated...
- Page 5 Operation of this equipment in other environments may cause interference with radio communications, in which case the user at his own expense will be required to take whatever measures may be required to correct this interference. Trademarks SWIFT is a trademark of Texas Instruments.
- Page 7 Contents Contents Introduction ..............Background .
- Page 8 Contents Figures 2–1 Test Setup Connection Diagram ..........2–2 Measured Efficiency .
- Page 9 Chapter 1 Introduction This chapter contains background information for the TPS54614 and support documentation for the TPS54614 EVM evaluation module. The TPS54614 EVM performance specifications are given, as well as modification instructions if different preset output voltages are desired. Topic Page Background .
- Page 10 Texas Instruments application report SLVA105 – Designing With Internally Compensated SWIFTt Regulators. 1.2 Performance Specification Summary A summary of the TPS54614EVM performance specifications is provided by Table 1–1. All specifications are given for an ambient temperature of 25°C, unless otherwise noted.
- Page 11 Modifications 1.3 Modifications The EVM can be modified for different preset output voltages by using other devices in the TPS5461x family. For output voltages less than 2.5 V, only U1 needs to be changed. For output voltages 2.5 V and higher, the output capacitor (C1) also needs to be changed.
- Page 13 Chapter 2 Setup and Test Results This chapter describes how to properly connect, set up, and use the TPS54614 EVM. This chapter also presents the test results for the TPS54614, and covers efficiency, output voltage regulation, load transients, loop response, output ripple, and start-up. Topic Page Input/Output Connections...
- Page 14 Figure 2–1. Test Setup Connection Diagram TPS5461x SWIFT Product Family Part Number 0.9 V TPS54611 1.2 V TPS54612 1.5 V TPS54613 1.8 V TPS54614 2.5 V TPS54615 3.3 V TPS54616 TPS54614EVM TPS54610 SLVP183 REV A 2001 NOTE: All wire pairs should be twisted.
- Page 15 Efficiency 2.2 Efficiency The TPS54614 efficiency peaks at around 1.5 A of load current. At a full 6-A load the efficiency drops to around 83% with a 5-V input source. The efficiency shown in Figure 2–2 is typical for an ambient temperature of 25°C. The efficiency is lower at higher ambient temperatures, due to temperature variation in the drain-to-source resistance of the MOSFETs.
- Page 16 Thermal Performance 2.3 Thermal Performance The plot in Figure 2–4 shows the junction temperature versus the load current at 25°C ambient temperature. The case temperature is plotted in Figure 2–5. The low junction-to-case thermal resistance of the PWP package, along with a good board layout, helps to keep the junction temperature low at high output currents.
- Page 17 Output Voltage Regulation 2.4 Output Voltage Regulation The output voltage load regulation at 25°C is shown in Figure 2–6. The output voltage varies less than 0.3% over the entire input voltage range of 3.3 V to 5.0 V, and load range of 0 A to 6 A. Figure 2–6.
- Page 18 Output Voltage Regulation 2.5 Load Transients The TPS54614 EVM response to load transients is shown in Figure 2–7 and Figure 2–8. The load transient in Figure 2–7 transitions from 1.5 A to 4.5 A in 16 µs, while the load transient in Figure 2–8 transitions from 4.5 A to 1.5 A in 12 µs.
- Page 19 Output Voltage Regulation 2.6 Loop Characteristics The loop gain and phase for a 5.0-V input and a 6.0-A load are shown in Figure 2–9 and Figure 2–10. The loop crossover frequency is approximately 50 kHz, and the phase margin is approximately 46°. Figure 2–9.
- Page 20 Output Voltage Regulation 2.7 Output Voltage Ripple The output ripple voltage is plotted in Figure 2–11 for a 3.3-V input, and in Figure 2–12 for a 5.0-V input. The TPS54614 has a typical output voltage ripple of less than 15 mV Figure 2–11.
- Page 21 Output Voltage Regulation 2.8 Input Voltage Ripple The input voltage ripple for a 6-A load is shown in Figure 2–13 for a 3.3-V input and in Figure 2–14 for a 5.0-V input. With a 5.0-V input, the ripple is approximately 260 mVpp. The input voltage ripple can be made lower by adding capacitance to the input.
- Page 22 Output Voltage Regulation 2.9 Start-Up The start-up voltage waveform of the TPS54614 EVM is shown in Figure 2–15. The TPS54614 output begins to rise when the input rises above the 3.0-V startup level. The output voltage then ramps linearly to 1.8 V in 3.6 ms.
- Page 23 Chapter 3 Board Layout This chapter provides the TPS54614 EVM board layout illustrations. Topic Page Layout ............Board Layout...
- Page 24 Figure 3–1. Top-Side Assembly TPS5461x SWIFT Product Family Part Number 0.9 V TPS54611 1.2 V TPS54612 1.5 V TPS54613 1.8 V TPS54614 2.5 V TPS54615 3.3 V TPS54616 TPS54610 TPS54614EVM SLVP183 REV A 2001...
- Page 25 Layout Figure 3–2. Top-Side Layout Board Layout...
- Page 26 Layout Figure 3–3. Internal Layers Layout...
- Page 27 Layout Figure 3–4. Bottom-Side Layout Board Layout...
- Page 29 Chapter 4 Schematic and Bill of Materials This chapter provides a schematic diagram and bill of materials for the TPS54614 EVM. Topic Page Schematic ........... . Bill of Materials .
- Page 30 Schematic 4.1 Schematic Figure 4–1. EVM Schematic TPS54614PWP FSEL SS/ENA Enable 10 µF 220 µF PWRGD VBIAS 0.1 µF PWRGD 10 kΩ 7.2 µH VSENSE BOOT 0.047 µF PGND PGND PGND 680 µF AGND PGND PGND PwrPad Optional...
- Page 31 Bill of Materials 4.2 Bill of Materials Table 4–1. TPS54614 EVM Bill of Materials Count Ref Des Description Size Part Number Capacitor, POSCAP, 680-µF, 2.5-V, 7343 (D) Sanyo 2R5TPB680M 40-mΩ, 20% Capacitor, ceramic, 0.047-µF, 25-V, Murata GRM39X7R473K25 X7R, 10% Murata GRM39X7R104K25 Capacitor, ceramic, 0.1-µF, 25-V, X7R, 10%...
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