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TIPD101

Low side V-I converter reference design, 0-V to 5-V input, 0-mA to 500-mA output

Design files

TIPD101

Design files

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         
This Verified Design Includes:
  • Theory
  • Component Selection
  • TINA-TI Simulation
  • Schematics and PCB Layout
  • Verification and Measured Performance
  • Modification Options
Industrial
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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.

download Schematic — TIPD101
SLAC572.ZIP (510 K)

Detailed schematic diagram for design layout and components

download Schematic — TIPD101
TIDR175.PDF (110 K)

Detailed schematic diagram for design layout and components

download Bill of materials (BOM) — TIPD101
TIDR176.PDF (66 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

download Gerber file — TIPD101
TIDC138.ZIP (410 K)

Design file that contains information on physical board layer of design PCB

Products

Includes TI products in the design and potential alternatives.

Precision op amps (Vos<1mV)

OPA735 — Single 0.05uV/degC (max) single-supply CMOS operational amplifier, zero-drift series

Data sheet: PDF

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Software

Technical documentation

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Type Title Date
* User guide TIPD101 Verified Design Reference Guide Sep. 19, 2013

Related design resources

Design tools & simulation

SIMULATION TOOL
TINA-TI — SPICE-based analog simulation program

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