MAX9643 Evaluation Kit Evaluates: MAX9643 General Description Features The MAX9643 evaluation kit (EV kit) is an assembled and S -1.5V to 60V Input Common-Mode Range tested PCB used to evaluate the MAX9643 60V, high- S Ability to Test with External Sense Voltage speed, precision, unidirectional current-sense amplifier. S Proven PCB Layout The EV kit features a wide -1.5V to 60V input common- S Fully Assembled and Tested mode range. Ordering Information appears at end of data sheet. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION Not installed, resistorsshort 1FF Q10%, 50V X7R ceramic R3, R4, R5 0 (PC trace) (0603) C1, C2, C5, C7 4 capacitors (0805) Murata GRM21BR71H105K RS+, RS- 2 Test points 0.1FF Q10%, 50V X7R ceramic 60V, high-speed, precision, C3, C4 2 capacitors (0603) current-sense amplifier U1 1 Murata GRM188R71H104K (8 TDFN-EP) Maxim MAX9643TATA+ Not installed, ceramic capacitor C6 0 (0603) PCB: MAX9643 EVALUATION 1 KIT 0.1I Q1%, 0.5W sense resistor R1 1 (2010) IRC LRC-LRF2010LF-01-R100-F Component Suppliers SUPPLIER PHONE WEBSITE IRC, Inc. 361-992-7900 www.irctt.com Murata Americas 770-436-1300 www.murataamericas.com Note: Indicate that you are using the MAX9643 when contacting these component suppliers. For pricing, delivery, and ordering information, please contact Maxim Direct at 19-5858 Rev 1 5/15 1-888-629-4642, or visit Maxim Integrateds website at www.maximintegrated.com.MAX9643 Evaluation Kit Evaluates: MAX9643 Monitoring the Load Current Quick Start The EV kit monitors the load current through a current- sense resistor by converting the sense voltage to a volt- Recommended Equipment age output (V ). High-side current monitoring does not OUT MAX9643 EV kit interfere with the ground path of the load being measured, 12V, 2A power supply (VBATT) making it useful for a variety of high-reliability systems. 5V power supply (VCC) The output voltage is given by the following equations: Electronic load capable of sinking 1A V I R SENSE LOAD SENSE Digital voltmeter (DVM) Procedure VV A OUT SENSE V The EV kit is fully assembled and tested. Follow the steps below to verify board operation. Caution: Do not turn on where I is the current load applied to the device, LOAD power supplies until all connections are completed. R is the current-sense resistor R1, and A is the SENSE V 1) Set the input power supply to 12V and connect the device gain. positive terminal to the VBATT PCB pad. Connect the Applications ground of the power supply to the GND PCB pad. The device has an internal charge pump to generate a 2) Set the VCC power supply to 5V and connect the negative voltage rail to bias both the input stage and out- positive terminal to the VCC PCB pad. Connect the put stage of the current-sense amplifier. The EV kit uses ground of the VCC supply to the GND PCB pad. a 1FF flying capacitor (C1), which is placed as close 3) Set the electronic load to sink 1A. as possible to the CP1 and CP2 pins of the device to minimize loop area. 4) Connect the electronic loads positive terminal to the LOAD PCB pad. Connect the loads ground to the The use of a negative voltage rail for its input stage allows GND PCB pad. the input common-mode voltage range to extend 1.5V below ground. The internal negative rail also allows the 5) Connect the DVM across the OUT and GND PCB output voltage range to extend down to true ground. pads. 6) Turn on the 5V power supply. Evaluating the 10V/V Gain Version To evaluate the EV kit with the 10V/V gain version, 7) Turn on the 12V power supply. replace U1 with the MAX9643UATA+ device. 8) Adjust the electronic load current (I ) between 0 LOAD Additional Features and 1A and verify that V is proportional to V , OUT SENSE according to the following equation: To evaluate the EV kit with an external sense voltage, cut the trace between the resistor pads (R3 and R4), and connect the external sense voltage directly to the VV A OUT SENSE V RS+ and RS- test points. Take care to minimize the loop caused when wiring the RS+ and RS- test points to the where V = I x R1 and A = 2.5V/V. SENSE LOAD V external sense voltage to reduce noise pickup. Resistors R3 and R4, when utilized, allow an input Detailed Description of Hardware differential filter or an input common-mode filter to be The MAX9643 EV kit evaluates the MAX9643 unidirectional designed to study its effects on noise rejection in power high-side, current-sense amplifier, ideal for a wide variety electronic circuits, for example. Pads for an output filter of high-performance industrial power-supply applications. (R5/C6) are also available on the PCB. The current-sense amplifier provides an analog voltage output proportional to the load current through the external sense resistor (R1). Various test points and test pads are provided for ease of evaluation. Maxim Integrated 2 = = =