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Summary of Contents for Texas Instruments TPS61040EVM
- Page 1 TPS61040EVM-001 Evaluation Module User’s Guide PMP Portable Power February 2002 SLVU065...
- 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 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 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 2002, Texas Instruments Incorporated...
- Page 5 About This Manual This users guide describes the characteristics, operation, and use of the TPS61040EVM LCD bias supply evaluation module (EVM). This EVM is a Texas Instruments high-efficiency boost converter that is configured to generate 18 V at 20 mA, for LCD bias supply, from a single cell Li−Ion battery.
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Page 7: Table Of Contents
4−1 TPS61040EVM−001 Schematic .......... - Page 8 4−1 TPS61040EVM−001 Bill of Materials ..........
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Page 9: Introduction
Chapter 1 Introduction This chapter contains background information for the TPS61040 and support documentation for the TPS61040EVM−001 evaluation module. Topic Page Background .......... -
Page 10: Background
LCD bias with either a variable resistance or an analog voltage. The output voltage of the TPS61040EVM can be adjusted up to 28 V by modifying the resistor values used in resistor divider R1 & R2. The EVM can also be configured for higher or lower output currents. -
Page 11: Setup And Test Results
Chapter 2 Setup and Test Results This chapter describes how to properly connect, setup, and use the TPS61040EVM−001. This chapter also presents the test results for this EVM. Topic Page Input/Output Connections ........ -
Page 12: Input/Output Connections
Input/Output Connections 2.1 Input/Output Connections The TPS61040EVM−001 PWB has several connections, which are described in Table 2−1. Table 2−1. Input/Output Connections Reference Name Description Designator This is the positive connection to the input power supply. The leads to the input supply should be twisted and kept as short as possible. -
Page 13: Output Voltage Ripple
Output Voltage Ripple Figure 2−1. Start-Up Waveforms 2.4 Output Voltage Ripple Figure 2−2 shows the output voltage ripple with I = 20 mA. The top trace shows the ripple with 3.6-V input, and the bottom trace shows the ripple with a 4.2-V input. -
Page 14: Switching Waveforms
Switching Waveforms 2.5 Switching Waveforms Figure 2−3 shows the switching waveform at the SW pin of the TPS61040. When the internal FET turns on, the voltage at the SW pin is pulled to ground until the inductor current reaches 450 mA. When the inductor current reaches 450 mA, the FET turns off and the voltage at the SW pin rises to the output voltage plus the forward voltage drop of the diode. -
Page 15: Efficiency
Efficiency Figure 2−4. Input Ripple Voltage Input Ripple Voltage Input Ripple Current 2.7 Efficiency Figure 2−5 shows the measured efficiency of the TPS61040. Figure 2−5. Typical Efficiency V I = 6 V V I = 4.2 V V I = 3.6 V V I = 2.5 V 12.5 17.5... -
Page 16: Output Adjust
Output Adjust 2.8 Output Adjust The TPS61040EMV−001 provides two methods of output voltage adjustment for LCD contrast control. The first method of output voltage adjustment is accomplished with a variable resistor, while the second method is accomplished using a variable control voltage. 2.8.1 Variable Resistor Output Voltage Adjust This method is accomplished by removing R2 on the EVM and then placing... -
Page 17: Board Layout
3.1 Layout Board layout is critical for all switch mode power supplies. Figures 3−1, 3−2 and 3−3 show the board layout for the TPS61040EVM−001 PWB. The nodes with high-switching frequency are short and isolated from the noise-sensitive feedback circuitry. Careful attention has been given to the routing of high-frequency current loops. - Page 18 Layout Figure 3−2. Top Layer Routing Figure 3−3. Bottom Layer Routing Board Layout...
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Page 19: Schematic And Bill Of Materials
Chapter 4 Schematic and Bill of Materials This chapter provides the TPS61040EVM−001 schematic and bill of materials. Topic Page Schematic ........... . -
Page 20: Schematic
MBR0530 TPS61040DBV 2.21 MΩ 22 pF 4.7 µF 1 µF 162 kΩ Adjust 4.2 Bill of Materials Table 4−1. TPS61040EVM−001 Bill of Materials Reference Description Size Qty. Part # Capacitor, ceramic, 4.7 µF, 6.3 V, X5R, 15% 0805 Murata GRM21B60J475KA11...
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