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DAC8760IPWPR.B Datasheet(PDF) 49 Page - Texas Instruments |
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DAC8760IPWPR.B Datasheet(HTML) 49 Page - Texas Instruments |
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49 / 69 page  Under normal operation, most current in this circuit flows through Q1 and into R3. As current increases through R3, so does the voltage drop across R3, which increases the base-emitter voltage of Q2. Eventually the base- emitter voltage of Q2 becomes high enough to turn on Q2, which turns off Q1 and reduce the current that can pass from VIN to VOUT. The value of R3 sets the current limit. Be aware that this example is very simple and only applies for sourcing current into a resistive load. For cases involving both sourcing and sinking current as well as nonresistive loads, more complex circuits are required to achieve bidirectional current limiting. 9.2 Typical Application ISO7631FC DACx760 IOUT Voltage Output: 0 V to 5 V, 0 V to 10 V, ±5 V, ±10 V Current Output: 0 mA to 20 mA, 4 mA to 20 mA, 0 mA to 24 mA +15 V –15V 15-V Bidirectional TVS +15 V 15-V Bidirectional TVS Ferrite Bead 100 nF 100 nF 15 15 15 1 nF –VSENSE VOUT CMP +VSENSE REFIN REFOUT GND HART-IN HART Signal FSK 1200 Hz to 2200 Hz AVSS AVDD DVDD DVDD-EN +15 V –15 V 0.1 F 0.1 F 22 nF 100 pF 0.1 F 100 pF 0.1 F SCLK SDIN SDO CLR-SEL LATCH CLR ALARM 10 k INC OUTA OUTB VCC2 GND2 0.1 F 0.1 F ISO7631FC INC OUTA OUTB VCC2 GND2 VCC1 GND1 OUTC INA INB VCC1 GND1 OUTC INA INB Digital Controller GND VDD 0.1 F 0.1 F 0.1 F SCLK MOSI MISO CS GPIO GPIO Isolation Barrier TPS54062 +24-V Field Supply Input Field GND +18 V –18 V TPS7A30 TPS7A49 –15 V +15 V Field Connections 100 pF –15 V 10 Ω Figure 9-6. Voltage and Current Output Driver for Factory Automation and Control, EMC and EMI Protected - DACx760 in an Analog Output (AO) Module 9.2.1 Design Requirements Analog I/O modules are used by programmable logic controllers (PLCs) and distributed control systems (DCSs) to interface to sensors, actuators, and other field instruments. These modules must meet stringent electrical specifications for both performance as well as protection. These outputs are typically current loops based on the 4-mA to 20-mA range and derivatives or voltage outputs ranging from 0 V to 5 V, 0 V to 10 V, ±5 V, and ±10 V. Common error budgets accommodate 0.1% full-scale range total unadjusted error (% FSR TUE) at room temperature. Designs that desire stronger accuracy over temperature frequently implement calibration. Often times the PLC back-plane provides access to a 12-V to 36-V analog supply from which a majority of supply voltages are derived. www.ti.com DAC7760, DAC8760 SBAS528D – JUNE 2013 – REVISED DECEMBER 2021 Copyright © 2021 Texas Instruments Incorporated Submit Document Feedback 49 Product Folder Links: DAC7760 DAC8760 |
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