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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 — 40-V, dual 1MHz, rail-to-rail input/output, low-offset-voltage, low-power op amp
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 AD 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

Technical documentation

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Type Title Date
* Application note High-side current-sensing circuit design with MSP430 smart analog combo (Rev. B) Mar. 06, 2020
* Application note High-side current-sensing circuit design (Rev. A) Feb. 13, 2019
E-book Simplifying Current Sensing (Rev. A) Jan. 09, 2020
Application note How to Use the Smart Analog Combo in MSP430™ MCUs (Rev. A) Oct. 24, 2019
Application note Using An Op Amp for High-Side Current Sensing Mar. 22, 2019
E-book Analog Engineer’s Circuit Cookbook: Amplifiers (Rev. A) Feb. 18, 2019
Application note Difference amplifier (subtractor) circuit (Rev. A) Jan. 31, 2019
Application note High-voltage, high-side floating current sensing circuit using current output, c Jun. 28, 2018
User guide 10-uA to 100-mA 0.05%-Error High-Side Current Sensing Design Guide Oct. 03, 2013

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