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TIPD101
Low side V-I converter reference design, 0-V to 5-V input, 0-mA to 500-mA output
TIPD101
Overview
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.
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 amp
- Good compliance voltage to the both rails
- Design allows for a floating load
- Excellent DC performance and temperature drift using zero-drift OPA735 op amp
- Theory
- Component Selection
- TINA-TI Simulation
- Schematics and PCB Layout
- Verification and Measured Performance
- Modification Options
Industrial
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
Design files & products
Design files
Download ready-to-use system files to speed your design process.
SLAC572.ZIP (510 K)
Detailed schematic diagram for design layout and components
TIDR175.PDF (110 K)
Detailed schematic diagram for design layout and components
TIDR176.PDF (66 K)
Complete listing of design components, reference designators, and manufacturers/part numbers
TIDC138.ZIP (410 K)
Design file that contains information on physical board layer of design PCB
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Technical documentation
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| Type | Title | Date | ||
|---|---|---|---|---|
| * | User guide | TIPD101 Verified Design Reference Guide | Sep. 19, 2013 |
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