Related Manuals for Texas Instruments TPS61042EVM-226
Summary of Contents for Texas Instruments TPS61042EVM-226
- Page 1 查询TPS61042EVM-226供应商 捷多邦，专业PCB打样工厂，24小时加急出货 TPS61042EVM 226 White Light LED Bias Supply EVM User’s Guide September 2002 PMP EVMs...
- 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 2002, Texas Instruments Incorporated...
- Page 5 This user’s guide describes the characteristics, operation, and use of the TPS61042EVM–226 white light LED bias supply evaluation module (EVM). This EVM is a Texas Instruments high-efficiency boost converter that is config- ured to supply 20 mA of bias current to four white light LEDs, from a 1.8 V to 6 V input voltage.
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Page 7: Table Of Contents
4–1 TPS61042EVM-226 Bill of Materials .......... - Page 8 Contents...
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Page 9: Introduction
Chapter 1 Introduction This chapter contains background information for the TPS61042 and support documentation for the TPS61042EVM–226 evaluation module. Topic Page Background .......... -
Page 10: Background
Background 1.1 Background This TPS61042EVM uses the TPS61042 boost converter to provide 20 mA of bias current to a four-element white LED from a 1.8 V to 6 V input. This EVM may be modified to drive more or less than four LEDs. It may also be modified to deliver a higher or lower output current to the LEDs. -
Page 11: Setup
Chapter 2 Setup This chapter describes how to properly connect, set up, and use the TPS61042EVM-226. Topic Page Input/Output Connections ........ -
Page 12: Input/Output Connections
Input/Output Connections 2.1 Input/Output Connections The TPS61042EVM–226 PWB has several connections, which are described in Table 2–1. Table 2–1. Input/Output Connections Reference Designator Name Description 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: Analog Dimming With Pwm Voltage
EVM Operation is the minimum output current o_min is the maximum output current o_max Reference designators correspond to the EVM schematic shown in Chapter 4 R 3 * I R 3 ) V I o_max o_min adj_min adj_max R 2 + V ) I o_max o_min adj_min... -
Page 14: Pwm Dimming Using Ctrl
Setup 2.2.3 PWM Dimming Using CTRL The third method for dimming the LEDs is to inject a PWM voltage into the CTRL pin of the TPS61042. The LED current is proportional to the CRTL pin duty cycle. Refer to the TPS61042 data sheet for more information on this dimming method. -
Page 15: Board Layout
Chapter 3 Board Layout This chapter provides the TPS61042EVM-226 board layout and illustrations. Topic Page Layout ............ -
Page 16: Layout
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 TPS61042EVM–226 PWB. The nodes with a high switching frequency are short and are isolated from the noise sensi- tive feedback circuitry. - Page 17 Layout Figure 3–3. Bottom Layer Routing...
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Page 19: Schematic And Bill Of Materials
Chapter 4 Schematic and Bill of Materials This chapter provides the TPS61042EVM–226 schematic and bill of materials. Topic Page Schematic ........... . Bill of Materials . -
Page 20: Schematic
Schematic 4.1 Schematic... -
Page 21: Bill Of Materials
Bill of Materials 4.2 Bill of Materials Table 4–1. TPS61042EVM-226 Bill of Materials Count Ref Des Description Size Part Number Capacitor, ceramic, 4.7 µF, Murata GRM21BR60J475KA11 6.3 V, X5R, 10% Capacitor, ceramic, 0.1 µF, 25 V, Murata GRM188R71E104KA01 X7R, 10%...
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