Three-phase, 1.25-kW, 200-VAC small form factor GaN inverter reference design for integrated drives


Design files


This reference design is a three-phase inverter with a continuous power rating of 1.25 kW at 50°C ambient and 550 W at 85°C ambient for driving 200-V AC servo motors. It features 600-V LMG3411R150 Gallium Nitride (GaN) power modules with an integrated FET and gate driver mounted on an 1.95-mm Insulated Metal Substrate (IMS) board for efficient heat dissipation. Isolation and control circuits are mounted on separate FR-4 boards - the dimensions of the design are 80 mm × 46 mm × 37 mm, including heatsink, control, isolation, and power stage. This ultra-small form factor, coupled with the ability to be natural convection fanless cooled, allows for easy integration of the drive with the motor, reducing the required cabinet space by up to 50% and cable lengths by up to 90 m in 6-axis motor applications including robotics, CNC machines, and so forth.

  • 600 V, 6-A LMG3411R150 GaN enables a power density of 150 W/in3 in 50°C ambient conditions up to 1.25 kW and in 85°C ambient conditions up to 550 W
  • Ultra-small form factor and natural convection fanless cooling allows easy integration of the drive with the motor-saving floor space and cabling costs
  • Very fast switching transition (<5 ns) with minimal switch node voltage ringing reduces EMI
  • High-efficiency power stage (peak efficiency >99% at 32-kHz PWM) reduces heat-sink size
  • Protection against gate undervoltage, device overcurrent, and overtemperature
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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

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Reference design overview and verified performance test data


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


Detailed overview of design layout for component placement


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


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AND gates

SN74AHC1G081-ch, 2-input 2-V to 5.5-V high-speed (9 ns) AND gate

Data sheet: PDF | HTML
AND gates

SN74LVC1G111-ch, 3-input 1.65-V to 5.5-V 32 mA drive strength AND gate

Data sheet: PDF | HTML
Digital isolators

ISO7721Robust EMC, dual-channel, 1/1, reinforced digital isolator

Data sheet: PDF | HTML
Gallium nitride (GaN) ICs

LMG3411R150600-V 150-mΩ GaN with integrated driver and cycle-by-cycle overcurrent protection

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

TLV1117800-mA, 15-V, linear voltage regulator

Data sheet: PDF | HTML
Shunt voltage references

TL431Adjustable precision shunt regulator

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Application note Thermal Comparison of FR-4 and Insulated Metal Substrate PCB for GaN Inverter Jun. 24, 2019
* Design guide Three-phase, 1.25-kW, 200-VAC small form factor GaN inverter reference design (Rev. A) Mar. 15, 2019
Application note Designing With the Improved TL431LI (Rev. A) Jun. 28, 2019
Application note High Voltage Half Bridge Design Guide for LMG3410 Smart GaN FET (Rev. A) Nov. 10, 2018
Technical article GaN reliability standards reach milestone Sep. 18, 2017
White paper GaN power module performance advantage in DC/DC converters Mar. 02, 2015

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