TPS22945EVM-082

User's Guide SLVUAA4 – September 2014 Using the TPS22945EVM-082 Single Channel Current Limited Load Switch IC The TPS22945EVM-082 evaluation module (EVM) allows the user to connect power to and control the 5pin DCK package load switch. The features of the current limiting switch can be easily evaluated using the EVM connections. Table 1 lists a short description of the TPS22945 load switch performance specifications; for additional details on load switch performance, application notes, and the datasheet see ti.com/loadswitch. 1 2 3 4 5 6 7 Contents Introduction ................................................................................................................... 1.1 Description ........................................................................................................... 1.2 Features .............................................................................................................. Electrical Performance ...................................................................................................... Schematic ..................................................................................................................... Layout ......................................................................................................................... 4.1 Setup ................................................................................................................. Operation ..................................................................................................................... Test Configurations .......................................................................................................... 6.1 On-Resistance (RON) Test Setup .................................................................................. 6.2 Timing Test Setup .................................................................................................. 6.3 Some Examples of TPS22945 Fault Detection Conditions ................................................... Bill of Materials (BOM) ...................................................................................................... 2 2 2 2 2 3 4 5 5 5 6 7 8 List of Figures ........................................................................................... ....................................................................................... TPS22945EVM-082 Top Layout ........................................................................................... TPS22945EVM-082 Bottom Layout ....................................................................................... RON Setup ..................................................................................................................... Typical Timing Setup ........................................................................................................ TPS22945 Over Current Shutdown (VIN = 3.3V) ......................................................................... TPS22945 Operating in Constant Current Mode with Auto Restart (VIN = 3.3V) .................................... 1 TPS22945EVM-082 Schematic 2 2 TPS22945EVM-082 Top Assembly 3 3 4 5 6 7 8 3 4 5 6 7 7 List of Tables 1 TPS22945 Current Limit, Blanking Time, Enable, and Auto Restart Characteristics ............................... 2 2 TPS22945EVM-082 Bill of Materials ...................................................................................... 8 SLVUAA4 – September 2014 Submit Documentation Feedback Using the TPS22945EVM-082 Single Channel Current Limited Load Switch IC Copyright © 2014, Texas Instruments Incorporated 1 Introduction 1 www.ti.com Introduction Table 1. TPS22945 Current Limit, Blanking Time, Enable, and Auto Restart Characteristics 1.1 EVM Device Current Limit Minimum Current Limit Blanking Time Auto Restart Time Enable (ON Pin) HVL082 TPS22945 100 mA 10 ms 80 ms Active High Description The TPS22945EVM is a two sided PCB containing the TPS22945 load switch device. The VIN and VOUT connections to the device and the PCB layout routing provide a low resistance pathway into and out of the device under test. Test point connections allow the EVM User to control the device with user defined test conditions and make accurate RON and timing measurements. 1.2 Features • • • • 2 VIN input voltage range: 1.62 V to 5.5 V. EVM allows access to the VIN, VOUT, GND, ON and OC pin of the TPS22945 Load Switch Device. On board CIN and COUT capacitors. VIN Sense and VOUT Sense test points provide an accurate measurement point of contact to the device. Electrical Performance Refer to the datasheet for detailed electrical characteristics of the TPS22945 (SLVS832). 3 Schematic VIN 200mA Max Output Current 1.62v - 5.5v U1 J1 5 2 1 VIN 4 C1 1µF VIN J2 VOUT OC ON GND 1 1 2 3 TPS22945DCK VIN Sense GND 1 2 R2 JP3 JP2 TP3 VOUT C2 0.1uF 2 510 1 2 JP4 TP4 1 2 VOUT Sense GND GND GND VIN JP1 J3 GND HI TP1 3 2 1 2 1 ON R1 10k OC J4 TP2 1 2 GND LO GND GND GND Figure 1. TPS22945EVM-082 Schematic 2 Using the TPS22945EVM-082 Single Channel Current Limited Load Switch IC Copyright © 2014, Texas Instruments Incorporated SLVUAA4 – September 2014 Submit Documentation Feedback Layout www.ti.com 4 Layout Figure 2. TPS22945EVM-082 Top Assembly Figure 3. TPS22945EVM-082 Top Layout SLVUAA4 – September 2014 Submit Documentation Feedback Using the TPS22945EVM-082 Single Channel Current Limited Load Switch IC Copyright © 2014, Texas Instruments Incorporated 3 Layout www.ti.com Figure 4. TPS22945EVM-082 Bottom Layout 4.1 Setup This section describes the jumpers and connectors on the EVM as well as how to properly connect, set up, and use the EVM. 4.1.1 J1 – VIN Connection This is the connection for the positive lead from the input source 4.1.2 J2 – VOUT Connection This is the connection point for the output of the device. 4.1.3 JP1 – ON This is the enable input for the device. A shorting jumper must be installed on JP1 in either the High or Low position. The TPS22945 is active High. ON must not be left floating. An external enable source can be applied to the EVM by removing the shunt and connecting a signal to TP1. Refer to the datasheet for proper ON and OFF voltage level settings. A switching signal may also be used and connected at this point. 4.1.4 TP3 - VIN Sense, TP4 - VOUT Sense These two connections are used when very accurate measurements of the input or output are required. RON measurements should be made using these sense connections when measuring the voltage drop from VIN to VOUT to calculate the resistance. 4 Using the TPS22945EVM-082 Single Channel Current Limited Load Switch IC Copyright © 2014, Texas Instruments Incorporated SLVUAA4 – September 2014 Submit Documentation Feedback Operation www.ti.com 4.1.5 JP2 - Input Capacitor During normal operation a shorting jumper is placed on JP2 this connects C1 capacitor from the input of the device to ground. Refer to the Applications Section of the datasheet for additional information on selecting the input capacitor. 4.1.6 JP3 - Output Capacitor During normal operation a shorting jumper is placed on JP3 this connects C2 capacitor from the output of the device to ground. Refer to the Applications Section of the datasheet for additional information on selecting the output capacitor. 4.1.7 J3 – J4– GND These are connections to GND. 5 Operation Connect the positive input of the VIN power supply to VIN at J1. Connect the negative lead of the power supply to GND at J3. The input voltage range of the TPS22945EVM-082 is 1.62 V to 5.5 V. External output loads can be applied to the switch by using J2 VOUT and J4 GND. Configure JP1 as required. JP1 must be installed for proper operation. When the ON pin is asserted high, the output of the TPS22945 will be enabled. 6 Test Configurations 6.1 On-Resistance (RON) Test Setup Figure 5 shows a typical setup for measuring On-Resistance. The voltage drop across the switch is measured using the sense connections then divided by the current into the load yielding the RON resistance. Figure 5. RON Setup SLVUAA4 – September 2014 Submit Documentation Feedback Using the TPS22945EVM-082 Single Channel Current Limited Load Switch IC Copyright © 2014, Texas Instruments Incorporated 5 Test Configurations 6.2 www.ti.com Timing Test Setup Figure 6 shows a test setup for measuring some of the typical timing features of the TPS22945 load switch. The OC output pin will switch to a low state when an overload condition or other fault conditions are encountered by the device. Connecting the switch as shown below will allow the user to capture these fault conditions with an oscilloscope. Figure 6. Typical Timing Setup 6 Using the TPS22945EVM-082 Single Channel Current Limited Load Switch IC Copyright © 2014, Texas Instruments Incorporated SLVUAA4 – September 2014 Submit Documentation Feedback Test Configurations www.ti.com 6.3 Some Examples of TPS22945 Fault Detection Conditions Figure 7. TPS22945 Over Current Shutdown (VIN = 3.3V) Figure 8. TPS22945 Operating in Constant Current Mode with Auto Restart (VIN = 3.3V) SLVUAA4 – September 2014 Submit Documentation Feedback Using the TPS22945EVM-082 Single Channel Current Limited Load Switch IC Copyright © 2014, Texas Instruments Incorporated 7 Bill of Materials (BOM) 7 www.ti.com Bill of Materials (BOM) Table 2. TPS22945EVM-082 Bill of Materials Designator Qty Value Description Package Reference Part Number Manufacturer HVL082 Any 0603 GRM188R71E105KA12D Murata CAP, CERM, 0.1µF, 100V, ±10%, X7R, 0603 0603 GRM188R72A104KA35D Murata 3 Fiducial mark. There is nothing to buy or mount. Fiducial N/A N/A J1, J2, J3, J4 4 Header, 100mil, 2x1, Gold, TH Header, 2x1, 100mil 5-146261-1 TE Connectivity JP1 1 Header, 100mil, 3x1, Tin plated, TH Header, 3 PIN, 100mil, Tin PEC03SAAN Sullins Connector Solutions JP2, JP3, JP4 3 Header, 100mil, 2x1, Tin plated, TH Header, 2 PIN, 100mil, Tin PEC02SAAN Sullins Connector Solutions LBL1 1 Thermal Transfer Printable Labels, 0.650" W x 0.200" H - 10,000 per roll PCB Label 0.650"H x 0.200"W THT-14-423-10 Brady R1 1 10k RES, 10kΩ, 5%, 0.1W, 0603 0603 CRCW060310K0JNEA Vishay-Dale R2 1 510 RES, 510 Ω, 5%, 0.125W, 0805 0805 ERJ-6GEYJ511V Panasonic TP1, TP2 2 Yellow Test Point, Multipurpose, Yellow, TH Yellow Multipurpose Testpoint 5014 Keystone TP3, TP4 2 Red Test Point, Multipurpose, Red, TH Red Multipurpose Testpoint 5010 Keystone U1 1 Low-input-voltage current-limited load switches with shut off and auto-restart feature, DCK0005A DCK0005A TPS22945DCK Texas Instruments PCB1 1 Printed Circuit Board C1 1 1µF CAP, CERM, 1µF, 25V, ±10%, X7R, 0603 C2 1 0.1µF FID1, FID2, FID3 NOTE: Unless otherwise noted in the Alternate PartNumber and/or Alternate Manufacturer columns, all parts may be substituted with equivalents. 8 Using the TPS22945EVM-082 Single Channel Current Limited Load Switch IC Copyright © 2014, Texas Instruments Incorporated SLVUAA4 – September 2014 Submit Documentation Feedback IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. 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