Related Manuals for Texas Instruments TPS61045EVM-231
Summary of Contents for Texas Instruments TPS61045EVM-231
- Page 1 TPS61045EVM 231 Adjustable LCD Boost Converter Evaluation Module User’s Guide January 2003 PMP EVMs SLVU082...
- 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 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 This users guide describes the characteristics, operation, and use of the TPS61045EVM-231 adjustable LDC boost converter evaluation module (EVM). This EVM is a Texas Instruments high-efficiency, digitally adjustable, boost converter that is configured to deliver an 18 V LCD bias supply. This user’s guide includes a schematic diagram and bill of materials (BOM).
- Page 7 4–1 TPS61045EVM-231 Bill of Materials ..........
- Page 8 Contents viii...
- Page 9 Chapter 1 Introduction The Texas Instruments TPS61045EVM evaluation module (EVM) helps designers evaluate the operation and performance of this device. The TPS61045EVM uses the TPS61045 boost converter to provide a high efficiency, digitally adjustable, 18 V output for LCD bias supplies. This EVM may be modified to supply higher or lower output voltages.
- Page 11 Chapter 2 Setup This chapter describes the jumpers, buttons, and connectors on the EVM as well as how to properly connect, set up, and use the TPS61045EVM-231. Topic Page J1–VIN ............
- Page 12 J1–VIN 2.1 J1–VIN 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. 2.2 J2–GND This is the return connection for the input power supply. 2.3 J3–VOUT This is the positive connection from the output of the power supply.
- Page 13 Operation 2.9 Operation The EVM has been optimized to provide 17.54 V at 10 mA from a Li-Ion battery input voltage range (3 V to 4.2 V). Higher or lower output voltages and currents can be obtained by following the design guidelines provided in the TPS61045 data sheet.
- Page 15 Chapter 3 Board Layout This chapter provides the TPS61045EVM-231 board layout and illustrations. Topic Page Layout ............
- Page 16 3.1 Layout Board layout is critical for all switch mode power supplies. Figure 3–1, Figure 3–2, and Figure 3–3 show the board layout for the TPS61045EVM-231 PWB. The nodes with a high switching frequency are short and are isolated from the noise sensitive feedback circuitry. Careful attention has been given to the routing of high frequency current loops.
- Page 17 Layout Figure 3–3. Bottom Layer Routing Board Layout...
- Page 18 Chapter 4 Schematic and Bill of Materials This chapter provides the TPS61045EVM-231 schematic and bill of materials. Topic Page Schematic ........... .
- Page 19 Schematic 4.1 Schematic Figure 4–1. TPS61045EVM-231 Schematic Vout 22 pF 2.21 M 4.7 µH 1 µF MBR0530T1 25 V 4.7 µF TPS61045QFN AGND 1 MΩ PGND CTRL CTRL 0.1 µF CTRL 182 kΩ 100 kΩ SN74LV123APWR 0.1 µF 1Rext/Cext 100 kΩ...
- Page 20 Bill of Materials 4.2 Bill of Materials Table 4–1. TPS61045EVM-231 Bill of Materials Description Size Part Number Capacitor, ceramic, 22 pF, 50 V, C0G, 5% Murata GRM1885C1H220JZ01 Capacitor, ceramic, 1.0 µF, 25 V, X7R, 20% 1206 Murata GRM31MR71E105KC01 Capacitor, ceramic, 4.7 µF, 6.3 V, X5R, 10%...
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