Evaluates: MAX4073F/MAX4073H/MAX4073T 19-4527 Rev 0 3/09 MAX4073 Evaluation Kit General Description Features The MAX4073 evaluation kit (EV kit) is an assembled High-Side Current Sensing and tested PCB used to evaluate the MAX4073 high- Multiple Fixed Gains Available side current-sense amplifier, which is designed for low- 20V/V (MAX4073T) cost, compact, current-sense applications. The EV kit 50V/V (MAX4073F) has a 2V to 28V input common-mode sense-voltage 100V/V (MAX4073H) range that is independent of the supply voltage. The EV kit comes assembled with the MAX4073F IC (internal 3V to 28V Operating Supply (VCC) gain = 50V/V), but can also evaluate the MAX4073T/ 2V to 28V Common-Mode Range Independent of MAX4073H (internal gains of 20/100, respectively) ICs. Supply Voltage Lead(Pb)-Free and RoHS Compliant Ordering Information Fully Assembled and Tested PART TYPE MAX4073EVKIT+ EV Kit +Denotes lead(Pb)-free and RoHS compliant. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION 0.07 1% current-sense resistor 0.1F 10%, 50V X7R ceramic R1 1 (1206) capacitors (0603) C1, C5 2 Vishay/Dale WSL1206R0700FEB Murata GRM188R71H104K TDK C1608X7R1H104K Not installed, resistorsshort R2, R3 0 (PC trace) (0603) C2, C4, C7, C8 0 Not installed, capacitors (0603) High-side current-sense amplifier 1F 10%, 50V X7R ceramic U1 1 (5 SC70) capacitors (0805) C3, C6 2 Maxim MAX4073FAXK+ Murata GRM21BR71H105K TDK C2012X7R1H105K 1 PCB: MAX4073 Evaluation Kit+ RS+, RS- 2 Test points Component Suppliers SUPPLIER PHONE WEBSITE Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com TDK Corp. 847-803-6100 www.component.tdk.com Vishay 402-564-3131 www.vishay.com Note: Indicate that you are using the MAX4073 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.MAX4073 Evaluation Kit Quick Start Detailed Description of Hardware The MAX4073 EV kit is a current-sense amplifier that Recommended Equipment measures the load current and provides an analog volt- 12V, 1A power supply (VBAT) age output. The EV kit is installed with a MAX4073FAXK+, 5V power supply (VCC) which has a gain of 50V/V. With the installed current- Electronic load capable of sinking 1A sense resistor (R ) value of 0.07, and a full-scale SENSE I of 1A, the full-scale V is set to 70mV. The SENSE SENSE Digital voltmeter (DVM) V is given by: OUT Procedure V =A x R x I OUT V SENSE SENSE The MAX4073 EV kit is fully assembled and tested. where I is the load current and A is the gain of SENSE V Follow the steps below to verify board operation. the device. Set the full-scale output range by selecting Caution: Do not turn on power supplies until all R and the appropriate gain version of the SENSE connections are completed. MAX4073. 1) Set the input power supply to 12V. Connect the Measuring the Load Current ground of the power supply to the GND pad and The load current is measured as a voltage drop connect the positive terminal to the VSOURCE pad. (V ) across an external sense resistor. This volt- SENSE 2) Set the VCC power supply to 5V. Connect the age is then amplified by the current-sense amplifier ground of the VCC supply to the GND pad and con- and presented at the OUT pad. Like all differential nect the positive terminal to the VCC pad. amplifiers, the output voltage has two components of 3) Set the electronic load to sink 1A. error (an offset error and a gain error). The offset error 4) Connect the electronic loads ground to the GND affects accuracy at low currents and the gain error pad. Connect the loads positive terminal to the affects accuracy at large currentsboth errors affect accuracy at intermediate currents. By minimizing both LOAD pad. offset and gain errors, accuracy is optimized over a 5) Connect the DVM across the OUT pad and the wide dynamic range. GND pad. 6) Turn on the 5V power supply. Evaluating Other Gain Versions The MAX4073 EV kit can be used to evaluate other gain 7) Turn on the 12V power supply. versions of the MAX4073 (20V/V, 100V/V = T, H suffix). 8) Adjust the electronic load current (I ) between SENSE Replace U1 with a different version of the MAX4073 0A and 1A and verify that V is proportional to OUT and refer to Table 1. Recommended Component V according to the following equation: SENSE Values in the MAX4073 IC data sheet for additional information. V = A x V OUT V SENSE where V = I x R1 and A is the gain of SENSE SENSE V the device (50V/V for MAX4073F). 2 Evaluates: MAX4073F/MAX4073H/MAX4073T