TIDA-060019

High-speed current shunt monitor reference design

TIDA-060019

Design files

Overview

This reference design is a low-side, bidirectional current shunt monitor using high-speed amplifiers. It is intended for applications that could benefit from faster fault detection, single shunt motor control, higher switching frequencies, higher gain, and or reduced general ADC sampling noise. This design featuresthe OPA365-Q1, OPA2836-Q1, and OPA607 in 10 V/ V of gain to monitor a 1-mΩ shunt.The default configuration is for ≤45-A systems, and accurately senses transients up to ±50x Vcc, for a Vcc range of 2.2 V to 5.5 V. The default configuration achieves <250 ns settling time for the typical acquisition period of the 3.3-V, 12-bit internal ADC of most TI motor microcontrollers. This design guide will review necessary considerations for fast and accurate current sensing, and for system safety and efficiency. 

Features
  • <250 ns 1/2LSB settling time for 12-bit, 3.3 VADC (0.4 mV)
  • Can easily be wired Into to existing board for validation
  • Quickly compare amplifier and filter types
  • Default gain: 10 mV/A
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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.

PDF | HTML
TIDUEH2C.PDF (1770 K)

Reference design overview and verified performance test data

TIDM765.PDF (200 K)

Detailed schematic diagram for design layout and components

TIDM766A.PDF (226 K)

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

TIDM767.PDF (146 K)

Detailed overview of design layout for component placement

TIDM769.ZIP (998 K)

Files used for 3D models or 2D drawings of IC components

TIDCFY7.ZIP (298 K)

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

TIDM768.PDF (54 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

High-speed op amps (GBW ≥ 50 MHz)

OPA2607Dual-channel, low-power, precision, 50-MHz decompensated CMOS op amp

Data sheet: PDF | HTML
High-speed op amps (GBW ≥ 50 MHz)

OPA2607-Q1Automotive, dual-channel, 50-MHz decompensated rail-to-rail output CMOS op amp

Data sheet: PDF | HTML
High-speed op amps (GBW ≥ 50 MHz)

OPA2836Dual, Very Low Power, Rail to Rail out, Negative Rail in, VFB Op Amp

Data sheet: PDF
High-speed op amps (GBW ≥ 50 MHz)

OPA2836-Q1Automotive, Dual, Very Low Power, Rail to Rail output, VFB Op Amp

Data sheet: PDF | HTML
High-speed op amps (GBW ≥ 50 MHz)

OPA3652.2V, 50MHz, Low-Noise, Single-Supply Rail-to-Rail Operational Amplifier

Data sheet: PDF | HTML
High-speed op amps (GBW ≥ 50 MHz)

OPA365-Q1Automotive 2.2V, 50MHz, Low-Noise, Single-Supply Rail-to-Rail Operational Amplifier

Data sheet: PDF | HTML
High-speed op amps (GBW ≥ 50 MHz)

OPA607Low power, precision, 50 MHz decompensated CMOS operational amplifier for cost sensitive systems

Data sheet: PDF | HTML
High-speed op amps (GBW ≥ 50 MHz)

OPA607-Q1Automotive, 50-MHz, low-power, gain of 6-V/V stable, rail-to-rail output CMOS operational amplifier

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide High-Speed Low-Side Current Sense Reference Design (Rev. C) PDF | HTML Aug. 23, 2022

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