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AD7171 Arkusz danych(PDF) 4 Page - Analog Devices |
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AD7171 Arkusz danych(HTML) 4 Page - Analog Devices |
4 / 5 page CN-0188 Circuit Note Rev. B | Page 4 of 5 Figure 3 shows an alternate circuit which can be used when galvanic isolation is required. The "ground" for the entire circuit is connected to the −48 V source. The isolated +3.3 V from the ADuM5402 is used to power the circuit. Note that this configuration does not require the op amp/MOSFET level shifter (see Figure 1) because the level shifting function is accomplished by the ADuM5402 isolator which allows a new ground reference (GND1) to be established for the digital signals. A single zero-drift ADA4051-1 provides a gain of 49.7 to the shunt voltage. Resistor R1 provides a positive offset voltage of 100 mV at the op amp output that allows the circuit to operate down to zero load current. If this offset is added, then R3 should be reduced to 46.4 kΩ to maintain a full-scale ADC input voltage of 2.5 V for a 50 mV shunt voltage. Without the offset, the ADA4051-1 output will become nonlinear for output voltages less than about 40 mV. CIRCUIT EVALUATION AND TEST This circuit uses the EVAL-CN0188-SDPZ circuit board and the EVAL-SDP-CB1Z System Demonstration Platform (SDP) evaluation board. The two boards have 120-pin mating connectors, allowing for the quick setup and evaluation of the circuit’s performance. The EVAL-CN0188-SDPZ board contains the circuit to be evaluated, as described in this note, and the SDP evaluation board is used with the CN0188 evaluation software to capture the data from the EVAL-CN0188-SDPZ circuit board. Equipment Needed • PC with a USB port and Windows® XP or Windows Vista® (32-bit), or Windows® 7 (32-bit) • EVAL-CN0188-SDPZ circuit evaluation board • EVAL-SDP-CB1Z SDP evaluation board • CN0188 evaluation software • Power supply: +6 V, or +6 V “wall wart” • Shunt resistor with maximum voltage of 50 mV at the maximum load current. • Electronic load Getting Started Load the evaluation software by placing the CN0188 evaluation software disc in the CD drive of the PC. Using "My Computer," locate the drive that contains the evaluation software disc and open the Readme file. Follow the instructions contained in the Readme file for installing and using the evaluation software. Functional Block Diagram See Figure 1 of this circuit note for the circuit block diagram and the “EVAL-CN0188-SDPZ-SCH” pdf file for the circuit schematics. This file is contained in the CN0188 Design Support Package. Setup Connect the 120-pin connector on the EVAL-CN0188-SDPZ circuit board to the connector marked “CON A” on the EVAL-SDP-CB1Z evaluation (SDP) board. Nylon hardware should be used to firmly secure the two boards, using the holes provided at the ends of the 120-pin connectors. Connect a shunt resistor across the input terminals (RSHUNT) with a load to ground as indicated in Figure 1. With power to the supply off, connect a +6 V power supply to the pins marked “+6 V” and “GND” on the board. If available, a +6 V "wall wart" can be connected to the barrel connector on the board and used in place of the +6 V power supply. Connect the USB cable supplied with the SDP board to the USB port on the PC. Note: Do not connect the USB cable to the mini USB connector on the SDP board at this time. It is important to connect the system ground and the PCB isolated ground to guarantee correct voltage levels and operation. Test point 31 and test point 32 give access to the GND_ISO required to properly make this connection. Test Apply power to the +6 V supply (or “wall wart”) connected to the EVAL-CN0188-SDPZ circuit board. Launch the evaluation software and connect the USB cable from the PC to the USB mini-connector on the SDP board. Once USB communications are established, the SDP board can be used to send, receive, and capture serial data from the EVAL-CN0188-SDPZ board. Data can be recorded for various values of load current as the electronic load is stepped. Information and details regarding how to use the evaluation software for data capture can be found in the CN0188 evaluation software Readme file. Information regarding the SDP board can be found in the SDP User Guide. LEARN MORE CN0188 Design Support Package: http://www.analog.com/CN0188-DesignSupport Sino, Henri. “High-Side Current Sensing: Difference Amplifier vs.Current-Sense Amplifier,” Analog Dialogue 42-01, January (2008). Cantrell, Mark. Application Note AN-0971, Recommendations for Control of Radiated Emissions with isoPower Devices. Analog Devices. |
Podobny numer części - AD7171 |
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Podobny opis - AD7171 |
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