CIRCUIT060005

High-side current sensing with discrete difference amplifier circuit

CIRCUIT060005

Overview

This single–supply, high–side, low–cost current sensing solution detects load current between 50mA and 1A and converters it to an output voltage from 0.25V to 5V. High–side sensing allows for the system to identify ground shorts and does not create a ground disturbance on the load.
Features
  • Single 36V supply 
  • Input: 50mA to 1A 
  • Output: 0.25V to 5V
General-purpose op amps
OPA2990 Dual, 40-V, 1.1-MHz, low-power operational amplifier
MSP430 microcontrollers
MSP430FR2310 16 MHz integrated analog microcontroller with 2 KB FRAM, OpAmp, TIA, comparator with DAC, 10-bit ADC MSP430FR2311 16-MHz integrated analog microcontroller with 3.75-KB FRAM, OpAmp, TIA, comparator w/DAC, 10-bit ADC MSP430FR2353 24 MHz 105 C integrated analog microcontroller with 16 KB FRAM, Op-Amps/PGAs, 12-bit DACs, 12-bit AD MSP430FR2355 24-MHz 105-C integrated analog microcontroller with 32-KB FRAM, Op-Amps/PGAs, 12-bit DACs, 12-bit AD
Precision op amps (Vos<1mV)
OPA192 High-Voltage, Rail-to-Rail Input/Output, 5µV, 0.2µV/˚C, Precision Operational Amplifier
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Technical documentation

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Type Title Date
* Circuit design High-side current-sensing circuit design with MSP430 smart analog combo (Rev. B) PDF | HTML 06 Mar 2020
* Circuit design High-side current-sensing circuit design (Rev. A) 13 Feb 2019
E-book Analog Engineer’s Circuit Cookbook: Amplifiers (Rev. C) 18 Dec 2023
E-book Analog Engineer’s Circuit Cookbook: Amplifiers (Rev. B) 05 Oct 2022
E-book An Engineer's Guide to Current Sensing (Rev. B) 12 Apr 2022
Application brief Using An Op Amp for High-Side Current Sensing (Rev. A) PDF | HTML 07 Dec 2021
Application note How to Use the Smart Analog Combo in MSP430™ MCUs (Rev. A) PDF | HTML 24 Oct 2019
Circuit design Difference amplifier (subtractor) circuit (Rev. A) PDF | HTML 31 Jan 2019
Circuit design High-voltage, high-side floating current sensing circuit using current output, c 28 Jun 2018
User guide 10-uA to 100-mA 0.05%-Error High-Side Current Sensing Design Guide 03 Oct 2013

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