CIRCUIT060014

Voltage-to-current (V-I) converter circuit with MOSFET

CIRCUIT060014

Overview

This single-supply, low-side, V-I converter delivers a well-regulated current to a load which can be connected to a voltage greater than the op amp supply voltage. The circuit accepts an input voltage between 0 V and 2 V and converts it to a current between 0 mA and 100 mA. The current is accurately regulated by feeding back the voltage drop across a low-side current-sense resistor, R3, to the inverting input of the op amp.
Features
  • Single 5-V supply
  • Input: 0 V to 2 V
  • Output: 0 mA to 100 mA
General-purpose op amps
TLV9042 Dual, 5.5-V, 350-kHz, Ultra-low 1.2-V, low quiescent current (10-μA) op amp TLV9062 Dual, 5.5-V, 10-MHz operational amplifier
4-20mA signal conditioners
XTR111 Voltage-to-current converter/transmitter with 3-V to 15-V regulator and resistor set I/O ratio

Technical documentation

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Type Title Date
* Application note Voltage-to-current (V-I) converter circuit with MOSFET (Rev. A) Aug. 20, 2021
Application note Voltage-to-current (V-I) converter circuit with BJT May 14, 2021
Application note AN-31 Amplifier Circuit Collection (Rev. D) Oct. 21, 2020
E-book Analog Engineer’s Circuit Cookbook: Amplifiers (Rev. A) Feb. 18, 2019
User guide TIPD102 Verified Design Reference Guide Sep. 19, 2013

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Reference designs

REFERENCE DESIGN
TIPD101 Low-Side V-I Converter Reference Design, 0 to 5 V Input, 0 mA to 500 mA Output TIPD102 High-Side V-I Converter, 0-2V to 0-100mA, 1% Full Scale Error

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