High-Bandwidth Phase Current and DC-Link Voltage Sensing Reference Design for Three-Phase Inverters


Design files


The TIDA-01541 reference design reduces system cost and enables a compact design for isolated phase current and DC link voltage measurement in three-phase inverters, while achieving high bandwidth and sensing accuracy. The output of the isolated amplifiers is interfaced to the internal ADC of the MCU using a differential-to-single-ended circuit. Use of isolated amplifiers enables using SAR ADC within MCU, thereby lowering system cost without any trade-offs on the current sensing. The 8-pin package reduces board form factor. High bandwidth of the isolated amplifier enables protection of IGBTs within 3.5 µs and high-performance specifications enable high-accuracy current and voltage measurements. The DC link voltage measurement is done with a high input impedance to avoid effect of source impedance due to high-voltage potential divider to improve accuracy.

  • Reinforced, isolated inverter suited for 400-V to 1200-V DC-link drives rated up to 10 kW
  • Reinforced, isolated amplifiers with high bandwidth (> 200 kHz) enable low latency current sensing and fast overcurrent detection (< 3 µs) to protect power stage
  • Reinforced, isolated amplifier with high impedance input optimized for precision sensing of high-impedance nodes like DC-link voltage, ±1% error for DC-link voltage sensing accuracy from 0-V to 1026-V DC
  • Calibrated current measurement error of ±0.5% over ±50-A FSR and across temperature range from –25°C to +85°C
  • Reinforced, isolated amplifier with low power consumption allows powering from gate drivers bootstrap capacitor simple LDO
  • Protection against DC bus undervoltage, overvoltage, overload, ground fault, and overtemperature

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.


Reference design overview and verified performance test data

TIDRU21A.PDF (590 K)

Detailed schematic diagram for design layout and components

TIDRU22.PDF (98 K)

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

TIDRU23.PDF (538 K)

Detailed overview of design layout for component placement

TIDRU25A.ZIP (5143 K)

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

TIDCE52.ZIP (439 K)

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

TIDRU24.PDF (3057 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.


TLC372Dual General Purpose LinCMOS™ Differential Comparator

Data sheet: PDF
Isolated amplifiers

AMC1301±250 mV-Input Precision Reinforced Isolated Amplifier for Current Sensing

Data sheet: PDF | HTML
Isolated amplifiers

AMC13112-V input, precision voltage sensing reinforced isolated amplifier

Data sheet: PDF | HTML
Isolated gate drivers

UCC215205.7kVrms, 4A/6A dual-channel isolated gate driver w/ dual input, disable pin, 8V UVLO in DW package

Data sheet: PDF | HTML
Isolated gate drivers

UCC215405.7kVrms 4A/6A dual-channel isolated gate driver with dual inputs, DT pin & 8V UVLO in DW or DWK pkg

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

TLV1117800-mA, 15-V, linear voltage regulator

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
NAND gates

SN74LVC1G10Single 3-input, 1.65-V to 5.5-V NAND gate

Data sheet: PDF
Precision op amps (Vos<1mV)

OPA320Precision, zero-crossover, 20-MHz, 0.9-pA Ib, RRIO, CMOS operational amplifier

Data sheet: PDF | HTML
Series voltage references

REF20333.3-V Vref, low-drift, low-power, dual-output Vref & Vref/2 voltage reference

Data sheet: PDF | HTML
Shunt voltage references

TL431Adjustable precision shunt regulator

Data sheet: PDF | HTML

Technical documentation

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* Design guide High-Bandwidth Phase Current and DC-Link Voltage Sensing Reference Design (Rev. A) Apr. 13, 2018

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