User’s Guide April 2004 SBVU007
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.
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.
EVM WARNINGS AND RESTRICTIONS It is important to operate this EVM within the input voltage range of 2.8 V and 5.5 V, and the output voltage range of 2.8 V and 5.5 V. Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions concerning the input range, please contact a TI field representative prior to connecting the input power.
Trademarks Preface About This Manual This user’s guide describes the TPS211xA evaluation module (EVM). This guide contains the EVM schematic, bill of materials, assembly drawing, and top and bottom layer printed circuit board layouts.
Trademarks Electrostatic Sensitive Devices This EVM contains components that can potentially be damaged by electrostatic discharge. Always transport and store the EVM in its supplied ESD bag when not in use. Handle using an antistatic wristband. Operate on an antistatic work surface. For more information on proper handling, refer to SSYA008.
Contents 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 2 EVM Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.1 Setting Up the EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.2 Current-Limit Adjustment . . . . . . . . .
Contents 2−1 3−1 4−1 4−2 4−3 Basic EVM Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TPS211xAEVM Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Component Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Top-Side Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 1 The TPS211xA EVM is an evaluation module for the Texas Instruments TPS211xA family of two-input, one-output power multiplexers. These multiplexers enable seamless transition between two power supplies, each operating at 2.8 V–5.5 V and delivering up to 1 A. EVM configurations are available for the TPS2110A through TPS2115A. Refer to Table 3−1, the schematic, and the bill of materials in this user’s guide to distinguish between these configurations.
1-2
Chapter 2 This chapter describes the proper setup of the TPS211xAEVM for use in device evaluations. Topic Page 2.1 Setting Up the EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 2.2 Current-Limit Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 2.3 Manual Switching Mode (TPS2110/1/4/5A Only) . . . . . . . . . . . . . . . . . . 2-2 2.4 Automatic Switching Modes . . . . . . . . . . . . . . . . . . . .
Setting Up the EVM 2.1 Setting Up the EVM The user is encouraged to read the applicable TPS211xA data sheet before using the EVM. The following test equipment is recommended: - Storage oscilloscope - Current probe - Two adjustable power supplies, 0 V – 6 V @ 2−A - Volt−Ohm meter - A passive or active load Figure 2−1 shows the EVM test configuration. Figure 2−1. Basic EVM Setup V1 RL V2 2.
Manual Switching Mode (TPS2110/1/4/5A Only) 2.3 Manual Switching Mode (TPS2110/1/4/5A Only) Potentiometer R2 and header J4 do not affect the operation of the manual switching mode. Some products like digital cameras and hand-held devices that receive power from an internal battery or from a docking station can take advantage of the manual-switching feature.
Output Voltage Holdup 2.4.2 Mode 2 Automatic Switching (TPS2110/1/2/3A Only) In Mode 2 automatic switching, OUT connects to IN1 if the voltage at IN1 is sufficiently high; otherwise, OUT connects to the higher of IN1 and IN2. The threshold at which IN1 is selected corresponds to approximately 0.8 V at test point TP3. The corresponding value of the IN1 voltage depends upon the setting of potentiometer R2. Adjusting R2 clockwise increases the IN1 selection threshold voltage.
Chapter 3 This chapter provides the TPS211xAEVM schematic and bill of materials. Topic Page 3.1 EVM Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 3.2 Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 3.3 Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EVM Configurations 3.1 EVM Configurations Table 3−1. Available EVM Configurations Switching Modes EVM Designator Device Current-Limit Adjustment Range Switch Status Output Automatic Manual HPA061−001 TPS2110A 0.31 A–0.75 A No Yes Yes HPA061−002 TPS2111A 0.63 A–1.25 A No Yes Yes HPA061−003 TPS2112A 0.31 A–0.75 A Yes Yes No HPA061−004 TPS2113A 0.63 A–1.25 A Yes Yes No HPA061−005 TPS2114A 0.31 A–0.75 A Yes Yes Yes HPA061−006 TPS2115A 0.63 A–1.25 A Yes Yes Yes 3.
Bill of Materials 3.3 Bill of Materials Table 3−2.
Bill of Materials Table 3−2.
Chapter 4 This chapter describes the TPS211xAEVM board layout and presents some component placement considerations. Topic 4.1 Page Layout Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Layout Considerations 4.1 Layout Considerations The IN1, IN2, and OUT pins of the TPS211xA can carry up to 1 A, so traces to these pins should be of suitable length and width to minimize the voltage drop to the load. Locate the 0.1 µF bypass capacitors close to the IN1, IN2, and GND pins of the TPS211xA. Figure 4−1. Component Placement Figure 4−2. Top-Side Layout Figure 4−3.
