Description
This Verified Design provides the theory: component selection: simulation: PCB design: and measurement details for a low-side voltage-to-current (V-I) converter. The circuit delivers a well-regulated current to a floating load which could include actuators: sensors: motors: LEDs: and many other applications. The design uses the OPA735 small-signal op amp to control an NPN emitter-follower that sources current to the load. The current is accurately regulated by feeding back the voltage drop across a low-side current-sense resistor to the op amp. The rail-to-rail input/output topology of the OPA735 allows for good accuracy even at low currents because there is very little dead-zone" in either the input or output stage. The auto-zero zero-drift technology in the OPA735 allows for great DC performance over temperature.See more TI Precision Designs"
End equipment reference diagrams
| Application area | End equipment |
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https://www.ti.com/solution/data-acquisition-daq#referencedesigns |
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Features
Converts Voltage to current: 0 to 5 V: 0 mA to 500 mA 1 % Error Single-supply solution with rail-to-rail input op ampGood compliance voltage to the both rails Design allows for a floating load Excellent DC performance and temperature drift using zero-drift OPA735 op amp This Verified Design Includes:TheoryComponent SelectionTINA-TI SimulationSchematics and PCB LayoutVerification and Measured PerformanceModification Options
Applications
- Data acquisition (DAQ)
- Weigh scale
Product categories
- Amplifiers
