Evaluates: MAX4173 19-4465 Rev 0 2/09 MAX4173 Evaluation Kit General Description Features The MAX4173 evaluation kit (EV kit) is a fully assembled Real-Time Current Monitoring and tested surface-mount PCB that contains a Wide 0 to 28V Input Common-Mode Range MAX4173TEUT+. The MAX4173 is a high-side, current- Independent of Operating Supply Voltage sense amplifier with an input common-mode voltage range that extends from 0 to 28V. The current-sense 0.5% Full-Scale Accuracy amplifier provides an analog voltage output proportion- Lead(Pb)-Free and RoHS Compliant al to the load current flowing through an external sense resistor. Fully Assembled and Tested The 20V/V gain version of the MAX4173 (MAX4173TEUT+) and a 150m sense resistor are installed on the board. Ordering Information Other gain versions of the MAX4173 can be evaluated by replacing the MAX4173TEUT+ with a MAX4173FEUT+ PART TYPE (50V/V) or a MAX4173HEUT+ (100V/V) and a user-sup- MAX4173EVKIT+ EV kit plied, external sense resistor. The user can easily match the full-scale sense voltage to the required out- +Denotes lead(Pb)-free and RoHS compliant. put-voltage range. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION 0.1F 10%, 50V X7R ceramic Not installed, resistorsshort R2, R3, R4 0 C1 1 capacitor (0603) (PC trace) (0603) Murata GRM188R71H104K RS+, RS- 2 Binding posts 4.7F 10%, 50V X7R ceramic TP1 1 Multipurpose test point, orange capacitor (1210) C2 1 TP2, TP4, TP6 3 Multipurpose test points, black Murata GRM32ER71H475K TP3, TP5 2 Multipurpose test points, red Not installed, ceramic capacitors C3, C4, C5 0 High-side current-sense amplifier (1210) (6 SOT23) U1 1 Not installed, ceramic capacitor Maxim MAX4173TEUT+ C6 0 (0603) 1 PCB: MAX4173 Evaluation Kit+ 0.15 1%, current-sense resistor R1 1 (1206) IRC LR1206LF-R150-F Component Suppliers SUPPLIER PHONE WEBSITE IRC, Inc. 361-992-7900 www.irctt.com Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com Note: Indicate that you are using the MAX4173 when contacting these component suppliers. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.MAX4173 Evaluation Kit Quick Start Detailed Description of Hardware The MAX4173 IC is a current-sense amplifier that mea- Recommended Equipment sures the load current and provides an analog voltage One 12V, 2A power supply output. The full-scale V is set to 150mV. The full- SENSE One electronic load capable of sinking 1A scale I is set at 1A. They can be changed by SENSE Two digital voltmeters (DVMs) replacing current-sense resistor R1 to another appropri- ate value. Procedure Applying the VCC Power Supply and the The MAX4173 EV kit is fully assembled and tested. Follow the steps below to verify board operation. Load Power Supply Caution: Do not turn on the power supply or the The MAX4173 EV kit is installed with a MAX4173TEUT+, electronic load until all connections are completed. which has a gain of 20V/V. The current-sense resistor value is 0.15. The V is given by: OUT 1) Set the power supply to 12V and connect the posi- tive terminal to test point TP3 (VCC) on the EV kit. V = V x A = I x 0.15 x 20 OUT SENSE V SENSE Connect the ground of the power supply to test where V is the sense voltage, I is the load SENSE SENSE point TP4 (GND) on the EV kit. current, and A is the gain of the device. V 2) Connect the positive terminal of the 12V power sup- Normal operating VCC is from 3V to 28V. RS+ and RS- ply to binding post RS+ on the EV kit. range is 0 to 28V. 3) Set the electronic load to sink 1A. Measuring the Load Current 4) Connect the positive terminal of the electronic load The load current is measured as a voltage drop to binding post RS- on the EV kit. (V ) across an external sense resistor. This volt- SENSE 5) Connect the negative terminal of the electronic load age is then amplified by the current-sense amplifier and to the ground of the power supply. presented at its OUT pin. 6) Connect a voltmeter across test point TP5 (RS+) The MAX4173 EV kit, which is assembled with the and test point TP6 (RS-). MAX4173TEUT+, is designed with a full-scale sense voltage drop of 150mV. For a typical 1A full-scale load 7) Connect the second voltmeter across test points current, this results in the use of a 0.15 sense resistor TP1 (OUT) and TP2 (GND). on the MAX4173 EV kit using the following equation: 8) Turn on the power supply. V SENSE FULL SCALE 9) Turn on the electronic load. R1= I LOAD FULL SCALE 10) Verify that the first DVM reading is approximately 150mV and the second DVM is approximately 3V. For different full-scale sense voltage and full-scale load-current arrangements, the equation above can be 11) Adjust the electronic load current to between 1A used to determine the appropriate current-sense- and 0A and verify that the reading of the second resistor values. Refer to the Recommended Component DVM is approximately 20 times the reading of the Values section in the MAX4173 IC data sheet for further first DVM. guidance. Evaluating the MAX4173FEUT+/MAX4173HEUT+ The MAX4173 EV kit can also be used to evaluate other gain versions of the MAX4173 (20V/V, 50V/V, 100V/V = T, F, H suffix, respectively). Replace U1 with a different version of the MAX4173 and refer to the Recommended Component Values section in the MAX4173 IC data sheet for additional information. 2 Evaluates: MAX4173