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TI GaN Power Design Boasts 200-V AC Servo Drives and Robotics with 99-percent Efficiency

Texas Instruments

TI New high-voltage, three-phase high PWM frequency inverter reference design delivers faster, more precise drive control

Texas Instruments (TI) unveils an innovative three-phase, gallium nitride (GaN)-based inverter reference design. It is sought to help engineers build 200-V, 2-kW AC servo motor drives and next-generation industrial robotics with fast current-loop control, higher efficiency, more accurate speed, and torque control.

Key benefits of TI’s new three-phase inverter design

  • High-efficiency power stage: 98 percent at 100 kHz PWM, 99 percent at 24 kHz PWM reduce heat sink size
  • High pulse width modulation (PWM) frequency: High PWM switching frequency allows for driving low-inductance motor with minimum current ripple
  • Fast switching transition: Less than 25 ns without any switch node voltage ringing reduces EMI
  • 600-V and 12-A LMG3410 GaN FET power stage with over 7 million device reliability hours: Allows for fast and easy PCB layout and small form-factor design.

The Three-Phase High-Frequency GaN Inverter Reference Design features TI’s newest LMG3410 600-V, 12-A GaN power module with an integrated FET, gate driver and protection, announced last year. T

TI also introduced today its new DesignDRIVE Fast Current Loop software with innovative sub-cycle PWM update techniques that help push current-loop performance in servo drives to less than 1 microsecond, potentially tripling motor torque response. The Fast Current Loop software outperforms traditional MCU-based current-loop solutions, and is available free with controlSUITE software.

In addition to the GaN module, the reference design relies on TI’s AMC1306 isolated delta-sigma modulators with current sensing to increase motor control performance. TI’s ISO7831 digital isolator also provides reinforced isolation between the MCU and the design’s six PWMs.

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