Related Manuals for Texas Instruments TPS54980EVM-022
Summary of Contents for Texas Instruments TPS54980EVM-022
- Page 1 TPS54980EVM 022 9 Amp, SWIFTE Regulator Evaluation Module User’s Guide September 2003 PMP Systems Power SLVU090...
- Page 2 TI product or service and is an unfair and deceptive business practice. TI is not responsible or liable for any such statements. Following are URLs where you can obtain information on other Texas Instruments products & application solutions:...
- 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 of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety measures typically found in the end product incorporating the goods.
- 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 2003, Texas Instruments Incorporated...
-
Page 5: Table Of Contents
Contents Introduction ..............Background . - Page 6 ........1−2 TPS54980EVM-022 Performance Specification Summary ......
- Page 7 About This Manual This user’s guide describes the characteristics, operation, and the use of the TPS54980EVM-022 evaluation module. It covers all pertinent areas involved to properly use this EVM board along with the devices that it supports. The physical PCB layout, schematic diagram, and circuit descriptions are included.
-
Page 9: Introduction
Chapter 1 Introduction This chapter contains background information for the TPS54980 as well as support documentation for the TPS54980EVM-022 evaluation module (HPA022). The TPS54980EVM-022 performance specifications are given, as well as modifications. Topic Page Background .......... -
Page 10: Background
Background 1.1 Background The TPS54980 tracking dc/dc converter is designed to provide accurate power sequencing in applications where two or more voltages are required for a load. These types of applications include core and I/O power supplies for microprosessors, DSPs, and FPGAs. Typically, some specific relation between the core and I/O supply voltages has to be provided during the power up and power down sequences. -
Page 11: Performance Specification Summary
25°C for all measurements, unless otherwise noted. The data presented in Table 1−2 was compiled with no load on the I/O output. The maximum input voltage for the TPS54980 is 4 V. Table 1−2. TPS54980EVM-022 Performance Specification Summary Parameters Test Conditions... -
Page 12: Modifications
Modifications 1.3 Modifications The TPS54980EVM-022 is designed to demonstrate the small size that can be attained when designing with the TPS54980, however many of the features, which allow for extensive modifications, have been omitted from this EVM. 1.3.1 Changing Output Voltage... -
Page 13: Power Sequencing
Modifications Figure 1−1. Frequency Trimming Resistor Selection Graph R − Resistance − kΩ An onboard electrolytic input capacitor may be added at C1. 1.3.3 Power Sequencing By selecting different R6−R7 resistor divider ratios, different power sequencing scenarios can be set. The Equations 1−3, 1−4, and 1−5 show how to select the different ways of power sequencing. -
Page 15: Test Setup And Results
Test Setup and Results This chapter describes how to properly connect, setup, and use the TPS54980EVM-022 evaluation module. The chapter also includes test results typical for the TPS54980EVM-022 and covers efficiency, output voltage regulation, load transients, loop response, output ripple, input ripple, and startup. -
Page 16: Input/Output Connections
Input/Output Connections 2.1 Input/Output Connections The TPS54980EVM−022 has the following three input/output connectors: VIN J1, VOUT I/O J2, and VOUT CORE J3. A diagram showing the connection points is shown in Figure 2−1. A power supply capable of supplying 8 A should be connected to J1 through a pair of 20 AWG wires. -
Page 17: Efficiency
Efficiency 2.2 Efficiency The TPS54980EVM−022 efficiency peaks at a load current of about 1 A to 2 A and then decreases as the load current increases towards full load. Figure 2−2 shows the efficiency of the TPS54980 at 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 18: Power Dissipation
2.3 Power Dissipation The low junction-to-case thermal resistance of the PWP package, along with well designed board layout, allows the TPS54980EVM-022 EVM to output full rated load current while maintaining safe junction temperatures. With a 3.3-V input source and a 9-A load, the junction temperature is approximately 60°C, while the case temperature is approximately 55°C. -
Page 19: Output Voltage Regulation
Output Voltage Regulation 2.4 Output Voltage Regulation The output voltage load regulation of the TPS54980EVM−022 is shown in Figure 2−4, while the output voltage line regulation is shown in Figure 2−5. Measurements are shown for an ambient temperature of 25°C. Figure 2−4. -
Page 20: Load Transients
Load Transients 2.5 Load Transients The TPS54980EVM−022 response to load transients is shown in Figure 2−6. The current step is from 25 to 75 percent of maximum rated load. Total peak-to-peak voltage variation is as shown, including ripple and noise on the output. -
Page 21: Output Voltage Ripple
Output Voltage Ripple Figure 2−8. Measured Loop Response, TPS54980, V MEASURED LOOP RESPONSE Phase Gain −10 −30 −60 −20 −90 −30 −40 −120 −150 −50 −180 −60 10 k 100 k f − Frequency − Hz 2.7 Output Voltage Ripple The TPS54980EVM−022 output voltage ripple is shown in Figure 2−9. -
Page 22: Input Voltage Ripple
Input Voltage Ripple 2.8 Input Voltage Ripple The TPS54980EVM−022 output voltage ripple is shown in Figure 2−10. The input voltage is 3.3 V for the TPS54980. Output current for each device is the rated full load of 9 A. Figure 2−10. Input Voltage Ripple, TPS54980 V O (ac) 20 mV/div V phase 1 V/div... -
Page 23: Power Up And Down
I/O voltage. If the resistors R6 = R1 and R7 = R2, then the core voltage tracks the I/O voltage. The start up voltage waveform of the TPS54980EVM-022 for this condition is shown in Figure 2−11. The waveform shows that the core voltage regulator tracks the output of the I/O regulator until the core regulator reaches its nominal 1.8-V level. -
Page 24: Power Down With Tracking
V O Core 500 mV/div t − Time − 1 ms/div The TPS54980EVM-022 EVM provides the ability to change the slew rate of the output voltage of the core regulator by using jumper JP2 (see schematic in Figure 4−1). If jumper JP2 is set so that R8 is connected in parallel to R7, ratiometric power sequencing is implemented. -
Page 25: Power Down With Ratiometric Sequencing
Power Up and Down Figure 2−14. Power Down With Ratiometric Sequencing V O I/O 500 mV/div V O Core 500 mV/div t − Time − 1 ms/div If jumper JP2 is set so that R8 is connected in parallel to R6, the core voltage rises first during power up and falls second during power down. -
Page 26: Power Up With Core Voltage Falling Second
Power Up and Down Figure 2−16. Power Up With Core Voltage Falling Second V O I/O 500 mV/div V O Core 500 mV/div t − Time − 1 ms/div 2-12... -
Page 27: Board Layout
Chapter 3 Board Layout This chapter provides a description of the TPS54980EVM-022 board layout and layer illustrations. Topic Page Layout ............ -
Page 28: Layout
Layout 3.1 Layout The board layout for the TPS54980EVM−022 is shown in Figure 3−1 through Figure 3−6. The topside layer of the TPS54980EVM−022 is laid out in a manner typical of a user application. The top and bottom layers are 1.5-oz. copper, while the two internal ground plane layers are 1-oz. -
Page 29: Internal Layer
Layout Figure 3−2. Internal Layer 2 Figure 3−3. Internal Layer 3 Board Layout... -
Page 30: Bottom Side Layout (Looking From Top Side)
Layout Figure 3−4. Bottom Side Layout (looking from top side) Figure 3−5. Top Side Assembly... -
Page 31: Schematic And Bill Of Materials
Chapter 4 Schematic and Bill of Materials The TPS54980EVM-022 schematic and bill of materials are presented in this chapter. Topic Page Schematic ........... . -
Page 32: Schematic
Schematic 4.1 Schematic The schematic for the TPS54980EVM−022 is shown in Figure 4−1. Figure 4−1. TPS54980EVM-022 Schematic... -
Page 33: Bill Of Materials
Bill of Materials 4.2 Bill of Materials The bill of materials for the TPS54980EVM−022 is listed in Table 4−1. Table 4−1. TPS54980EVM-022 Bill of Materials Count Ref Des Description Size Part Number Capacitor, POSCAP, 220 µF, 10 V, − 7343 (D) - Page 34 Bill of Materials Count Ref Des Description Size Part Number Adaptor, 3,5 mm probe clip (or 72900 Tektronix 131-4244-00 131-5031-00) Test point, red, 1 mm 0.038 Farnell 240-345 IC, high−side power distribution SW TPS201xD with current limit IC, tracking synchronous PWM PWP28 TPS54980PWP switcher...