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

Texas Instruments

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.

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Features

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 WUltra-small form factor and natural convection fanless cooling allows easy integration of the drive with the motor-saving floor space and cabling costsVery fast switching transition (High-efficiency power stage (peak efficiency >99% at 32-kHz PWM) reduces heat-sink sizeProtection against gate undervoltage: device overcurrent: and overtemperature