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CIRCUIT060047

High-side V-I with darlington pair circuit

CIRCUIT060047

Overview

This high-side voltage-to-current (V-I) converter delivers a well-regulated current to a load, R4. The circuit accepts an input voltage from 0 V to 10 V and converts it to an output current from 0 A to 5 A. The current is regulated by feeding the voltage across a low-side, current-sense resistor back to the op amp. The output Darlington pair allows for higher current gain than when using a single, discrete transistor.
Features
  • Input:
    • Vi = 0 V to 10 V
      • Iimax = 200 µA
  • Output:
    • Io = 0 A to 5 A
    • Pr5max = 0.25 W
  • Supply:
    • Vcc = 36
    • Vee = 0 V
General-purpose op amps
OPA2991 — Dual, 40-V, 4.5-MHz, low-power operational amplifier
Precision op amps (Vos<1mV)
OPA197 — Single, 36-V, precision, rail-to-rail input output, low offset voltage op amp
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Technical documentation

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Type Title Date
* Circuit design Voltage-to-current (V-I) converter circuit with a Darlington transistor PDF | HTML 14 May 2021
Application note AN-31 Amplifier Circuit Collection (Rev. D) 21 Oct 2020

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