TIDA-01543

Isolated Current Sense Reference Design (±300 A) for Traction Inverter With Overcurrent Detection

TIDA-01543

Design files

Overview

This reference design provides detection of traction motor phase currents. TIDA-01543 realizes an isolated current sensor. Precise in-line huntbased, motor phase current sensing is done with AMC1305M05-Q1 delta-sigma (ΔΣ) modulators and the INA301-Q1 device. The high CMTI of the modulator helps suppress inverter switching transients from corrupting the data on the controller side. The fast response time of the INA301-Q1 enables faster reaction times for overcurrent events. TIDA-01543 provides an interface to connect to an external MCU where digital SINC filters can be implemented to demodulate the AMC1305M05 output bit stream. This reference design uses the C2000 family, automotive-qualified F280049M Piccolo™ microcontroller control card.

Features
  • Reinforced, isolated ΔΣ modulator to measure in-line motor phase current with shunt resistor
  • Short-circuit response time of < 1.5 μs with SINC 3 filter and OSR 8
  • Nominal-phase current measurement range of ±300 A; transient peak range of ±80 Apk with 100-μΩ shunt resistor
  • Calibrated full-scale error of < 0.5 % across temperature range from 0°C to 125°C
  • Short-circuit response time of 300 ns with INA301 (parallel configuration alongside the AMC modulator)
  • High CMTI of modulator (> 15 kV/μs) improves noise immunity to switching transients

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.

TIDUDR5A.PDF (610 K)

Reference design overview and verified performance test data

TIDRWU1.PDF (551 K)

Detailed schematic diagram for design layout and components

TIDRWU2.PDF (56 K)

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

TIDRWU3.PDF (68 K)

Detailed overview of design layout for component placement

TIDRWU5.ZIP (6892 K)

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

TIDCET4.ZIP (232 K)

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

TIDRWU4.PDF (478 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

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INA301-Q1AEC-Q100, 36V, 550kHz, 4V/µs, high-precision current sense amplifier w/ comparator

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Digital isolators

ISO7710-Q1Automotive, robust EMC, single-channel, reinforced digital isolator

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Isolated ADCs

AMC1305M05-Q1Automotive reinforced isolated modulator with ±50-mV input and CMOS interface

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Linear & low-dropout (LDO) regulators

TPS717-Q1Automotive 150-mA, high-PSRR, low-IQ, low-dropout voltage regulator with enable

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Transformer drivers

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

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Technical documentation

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Type Title Date
* Design guide Isolated Current Sense Ref. Des. (±300 A) for Traction Inverter With Overcurrent (Rev. A) Nov. 07, 2018

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