Low-Side V-I Converter Reference Design, 0 to 5 V Input, 0 mA to 500 mA Output TIPD101 (ACTIVE)

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Key Document


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.

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  • 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         


    This Verified Design Includes:

  • Theory
  • Component Selection
  • TINA-TI Simulation
  • Schematics and PCB Layout
  • Verification and Measured Performance
  • Modification Options

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Test Data

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Design Files

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TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
OPA735  Single 0.05uV/degC (max) single-supply CMOS operational amplifier, zero-drift series  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
OPA735 Download Download
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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 907 19 Sep 2013
Design files (3)
Title Type Size (KB) Date
ZIP 410 19 Sep 2013
PDF 66 19 Sep 2013
PDF 110 19 Sep 2013
Related Tools & Software

Development Tools (1)

Name Part Number Tool Type
SPICE-based analog simulation program  TINA-TI  Circuit Design & Simulation 

Software (2)

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