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


This reference design provides detection of traction motor phase currents. The TIDA-01543 design realizes an isolated current sensor solution. 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. The 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 TI Design uses the C2000 family, automotive-qualified F280049M Piccolo™  icrocontroller control card.

  • 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

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TI Devices (5)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
AMC1305M05-Q1  Automotive Reinforced Isolated Modulator With ±50mV Input and CMOS Interface  Isolation  Sample & Buy View Design Kits & Evaluation Modules
INA301-Q1  AEC-Q100, 36V, 550kHz, 4V/µs, high-precision current sense amplifier w/ comparator  Current sense amplifiers  Sample & Buy View Design Kits & Evaluation Modules
ISO7710-Q1  Automotive, robust EMC, single-channel, reinforced digital isolator  Isolation  Sample & Buy View Design Kits & Evaluation Modules
SN6501-Q1  Automotive low-noise, 350-mA, 410-kHz transformer driver for isolated power supplies  Power for signal isolators  Sample & Buy View Design Kits & Evaluation Modules
TPS717-Q1  Automotive 150-mA, high-PSRR, low-IQ, low-dropout voltage regulator with enable  Power management  Sample & Buy Not Available

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
AMC1305M05-Q1 Download Download
INA301-Q1 Download Download
ISO7710-Q1 Download Download
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SN6501-Q1 Download
TPS717-Q1 Download Download
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User guide (1)
Title Type Size (KB) Date
PDF 610 07 Nov 2018
Design files (6)
Title Type Size (KB) Date
ZIP 232 30 Jul 2018
ZIP 6892 30 Jul 2018
PDF 478 30 Jul 2018
PDF 68 30 Jul 2018
PDF 56 30 Jul 2018
PDF 551 30 Jul 2018

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