TIDA-020018

Automotive shunt-based isolated current sensor reference design for DC/DC and OBC applications

TIDA-020018

Design files

Overview

This reference design demonstrates high-side primary current sensing in DC/DC converter and onboard charger (OBC) applications for hybrid and electric vehicles. Using an isolated shunt approach for current sensing has several advantages, including high accuracy, linearity and robustness. However, the large input range of isolated amplifiers causes the shunt to experience high power dissipation. To solve this problem, this reference design utilizes a lower input range isolated amplifier, reducing power dissipation while maintaining the advantages of the shunt-based approach.

Features
  • Lower input range of +/-50 mV facilitates lower power dissipations on the shunt
  • 3-us latency (fast response) with the isolated amplifier
  • High-side current sense circuit with CMTI of 140 kV/μs (typical), 70 kV/μs (minimum)
  • Un-calibrated accuracy of less than 1% across temperature range of -40ºC to 125ºC (AMC output)
  • Interfaces directly with differential- or single-ended ADC

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.

TIDUEL5.PDF (3031 K)

Reference design overview and verified performance test data

TIDRYO0.PDF (251 K)

Detailed schematic diagram for design layout and components

TIDRYO1.PDF (37 K)

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

TIDRYO2.PDF (105 K)

Detailed overview of design layout for component placement

TIDRYO4.ZIP (585 K)

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

TIDCF82.ZIP (698 K)

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

TIDRYO3.PDF (458 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Isolated amplifiers

AMC1302-Q1Automotive ±50-mV-input, high-precision, reinforced isolated amplifier for current sensing

Data sheet document-pdfAcrobat PDF open-in-new HTML
Linear & low-dropout (LDO) regulators

TPS763-Q1Automotive 150-mA, 10-V, low-dropout voltage regulator with enable

Data sheet document-pdfAcrobat PDF open-in-new HTML
Precision op amps (Vos<1mV)

OPA376-Q1Automotive Precision, Low Noise, Low Iq Operational Amplifier

Data sheet document-pdfAcrobat PDF open-in-new HTML
Series voltage references

LM4132-Q1Automotive, SOT-23 precision low dropout voltage reference

Data sheet document-pdfAcrobat PDF open-in-new HTML
Transformer drivers

SN6501-Q1Automotive low-noise, 350-mA, 410-kHz transformer driver for isolated power supplies

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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* Design guide Automotive shunt-based isolated current sensor reference design Jan. 15, 2019

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