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


Design files


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.

  • 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.

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Reference design overview and verified performance test data


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Technical documentation

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

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