Current Sensing with <1-us Settling for 1-, 2- & 3-Shunt FOC in 3-Phase Inverter Reference Design


Design files


The TIDA-00778 reference design demonstrates fast and accurate current sensing for a three-phase motor driven with sensorless field-oriented control (FOC). Drives with lower audible noise require faster andaccurate current sensing. The most common low-cost current-sensing methods use a single shunt on the DC bus return path or two to three shunts in the inverter legs. The major challenge in motor control is to enable accurate current sensing even with the lowest active vector duration. TIDA-00778 demonstrates sub-microsecond settling and accurate current sensing in such scenarios. The referencedesign is applicable to major appliances,especially in compressor motors, and the inverter power stage can work up to 2 kW.

  • Fast and accurate current sensing for sensorless FOC with single-, dual-, and triple-shunt topologies to minimize torque ripple and audible noise in motor drives
  • Single-shunt current sensing with minimum settling time and gate driver with lowest propagation delay enable active voltage vector duration < 1 μs
  • Single-shunt DC bus current sensing with < 0.15% calibrated accuracy
  • Dual- and triple-shunt current sensing with < 1.5-μs settling time and < 0.04% calibrated accuracy enabling accurate current sensing at extreme duty cycles
  • Overcurrent detection with response time < 1.5 μs
  • Input voltage 270-V to 390-V DC (rectified from 195-V to 265-V AC)
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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.

TIDUCY7.PDF (2980 K)

Reference design overview and verified performance test data

TIDRQF4.PDF (2020 K)

Detailed schematic diagram for design layout and components


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


Detailed overview of design layout for component placement

TIDRQF8.ZIP (4026 K)

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


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

TIDRQF7.PDF (3522 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Analog current-sense amplifiers

INA30336V, bi-directional, 550kHz, 4V/µs, high-precision current sense amplifier w/ window comparator

Data sheet: PDF | HTML
C2000 real-time microcontrollers

TMS320F28027FC2000™ 32-bit MCU with 60 MHz, 64 KB flash, InstaSPIN-FOC

Data sheet: PDF
C2000 real-time microcontrollers

TMS320F28027F-Q1Automotive C2000™ 32-bit MCU with 60 MHz, 64 KB flash, InstaSPIN-FOC

Data sheet: PDF

TLV1701Single high voltage, low power comparator

Data sheet: PDF | HTML
General-purpose op amps

TLV6001Single, 5.5-V, 1-MHz, RRIO operational amplifier

Data sheet: PDF | HTML
Half-bridge drivers

UCC277144-A, 600-V half bridge gate driver

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

OPA835Ultra Low Power, Rail to Rail Out, Negative Rail In, VFB Amplifier

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TLV704150-mA 24-V ultra-low-IQ low-dropout (LDO) voltage regulator

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Current Sensing With <1-µs Settling for 1-, 2- & 3-shunt FOC in 3-Phase Inverter Mar. 09, 2017
White paper Piccolo™ C2000™ MCUs enable the next generation of low-cost, dual-axis servo dri (Rev. A) Jul. 13, 2020
E-book Simplifying Current Sensing (Rev. A) Jan. 09, 2020

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