Cost optimized, < 1% accurate current sensing and protection for 3-phase inverter reference design


Design files


This reference design demonstrates a cost optimized three-phase inverter leg (low-side shunt) current sensing solution with high accuracy and faster response for sensorless 2-shunt or 3-shunt field oriented control (FOC). This reference design demonstrates inverter leg current sensing with full swing response settling time close to 1-µs and accuracy error less than 1%. The design also shows very good noise rejection even with high power IGBTs switching nearby. The design implements overcurrent protection fully in hardware with less than 1.5-µs total response time.

  • Current sensing with < 1.25 µs settling time and < 1% calibrated accuracy enabling accurate current sensing
  • Overcurrent protection fully implemented in hardware with fast response time < 1.5 µs
  • Positive and negative overcurrent protection in all the three inverter legs by using only two comparators
  • Low cost and accurate current sensing for sensorless FOC with dual and triple shunt topologies to minimize torque ripple and audible noise in motor drives
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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.

TIDUEF6.PDF (3539 K)

Reference design overview and verified performance test data


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

TIDRXE4.ZIP (6998 K)

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


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

TIDRXE3.PDF (1592 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

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

TLV9001One-channel, 1-MHz rail-to-rail input and output 1.8-V to 5.5-V operational amplifier

Data sheet: PDF | HTML
General-purpose op amps

TLV9064Quad, 5.5-V, 10-MHz, RRIO operational amplifier for cost-optimized applications

Data sheet: PDF | HTML
Half-bridge drivers

UCC277121.8-A/2.8-A, 620V half bridge driver with interlock

Data sheet: PDF | HTML
Noninverting buffers & drivers

SN74AHC3676-ch, 2-V to 5.5-V buffers with 3-state outputs

Data sheet: PDF | HTML

Start development

Design tools & simulation

Simulation model

TIDA-010023 Current Sensing Simulation — TIDM046.ZIP (12 K)

Simulation model

TIDA-010023 Overcurrent Protection Simulation — TIDM045.ZIP (18 K)

Technical documentation

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Type Title Date
* Design guide Cost Optimized, < 1% Accurate Current Sensing and Protection for 3-Phase Inverte Nov. 01, 2018

Related design resources

Reference designs

TIDA-00778 Current Sensing with <1-us Settling for 1-, 2- & 3-Shunt FOC in 3-Phase Inverter Reference Design TIDA-00947 3.3V 1A, Low EMI, 92% Efficiency DC/DC Module in Dual Layer TO-220 Form Factor Reference Design

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