Compact, Non-Isolated 3 Phase Inverter Reference Design for 200-480 VAC Industrial Drives


Design files


This reference design realizes a 3 phase inverter subsystem for variable frequency AC inverter drives and servo drives. This design is particularly suited for drive architectures in which the microcontroller and inverter ground are non-isolated. The basic isolated gate driver UCC5320S is used for driving the high side inverter switches, and the compact, six pin UCC27531 low side gate driver is used for driving the bottom switches. The result is for reinforced isolation to move to the UART communication channel. Inverter half bridge leg current sensing is done in two phases using shunt resistors and the dual operational amplifier TLV9062. This drive architecture results in a reduced number of reinforced isolated channels and enables a cost optimized, compact solution. This design is controlled by a C2000 microcontroller.

  • 3 phase inverter power stage suited for 200-480 Vac powered drives with continous current rating up to 10 Arms
  • Compact and cost-optimized solution due to:
    • Movement of reinforced isolation from the power stage to the inter-processor communication channel resulting in reduction of number of reinforced isolated devices from 9 to 1
    • Use of small low side gate drivers (SOT23 – 2.9 mm * 1.6 mm) and basic isolated high side gate drivers (SOIC8 – 4 mm * 5 mm)
    • Single power supply rail powering all gate drivers through bootstrap technique
    • High side gate driver with basic isolation in power stage minimizes creepage distances
  • Low propagation delay (< 75 ns) of gate drivers enable decreasing dead time which improves inverter efficiency and distortions
  • Robust solution due to gate drivers with enhanced immunity against miller dv/dt turn on events, negative input voltage handling and UVLO
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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.

TIDUDG8.PDF (1997 K)

Reference design overview and verified performance test data

TIDRT40.PDF (659 K)

Detailed schematic diagram for design layout and components

TIDRT41.PDF (34 K)

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

TIDRT42.PDF (336 K)

Detailed overview of design layout for component placement

TIDRT44.ZIP (2578 K)

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


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

TIDRT43.PDF (1631 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.


TL331High Voltage Single Differential Comparator

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Digital isolators

ISO7741Robust EMC, quad-channel, 3/1, reinforced digital isolator

Data sheet: PDF | HTML
General-purpose op amps

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

Data sheet: PDF | HTML
General-purpose op amps

TLV9062Dual, 5.5-V, 10-MHz operational amplifier

Data sheet: PDF | HTML
Isolated gate drivers

UCC53203k/5kVrms, 2A/2A single-channel isolated gate driver with UVLO referenced to GND or split output

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

TLV702300-mA, high-PSRR, low-IQ, low-dropout voltage regulator with enable

Data sheet: PDF | HTML
Low-side drivers

UCC275312.5-A/5-A single-channel gate driver with 8-V UVLO, 35-V VDD, and split outputs

Data sheet: PDF | HTML
Shunt voltage references

TLV4311.5% accuracy, low-voltage, adjustable precision shunt regulator

Data sheet: PDF | HTML
Transformer drivers

SN6501Low-noise, 350-mA, 410-kHz transformer driver for isolated power supplies

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Compact, Non-Isolated, Three-Phase Inverter Ref Design for 200 to 480-VAC Drives Oct. 09, 2017
Application brief Implementing a Bipolar Gate Drive for Low-Side IGBTs and SiC FETs in Motor Drive Oct. 10, 2019

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