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TIDA-010276

36V, 50A 3-phase GaN inverter reference design for BLDC motor control

TIDA-010276

Design files

Overview

This design demonstrates a 36V, 50A gallium nitride (GaN) field-effect transistor (FET) power stage for driving a three-phase brushless DC motor in cordless tools operating from a 5-cell Li-ion battery to a 10-cell battery pack. This reference design uses the LMG3100R017 GaN FET with integrated GaN-FET drive to improve the motor control system efficiency and performance. Additionally, the design offers a TI BoosterPack™ Plug-in Module compatible with 3.3V I/O interface that can connect to a C2000™ MCU LaunchPad™ development kit or MSPM0 MCU LaunchPad development kit for quick and easy performance evaluation of TI GaN technology.

Features
  • 6.50mm × 4.0mm LMG3100R017 GaN FET with integrated driver enables high power density and easy PCB layout
  • High efficiency (> 99% peak) at 20kHz PWM enables operation at 25°C ambient up to 50A peak current without heat sink, 98.5% efficiency at 80kHz PWM in 50A peak current
  • LMG3100R017 enables operation at higher PWM frequencies to help reduce DC-bus capacitor size and height by replacing electrolytic with ceramic capacitors
  • Zero reverse recovery losses reduce switch node oscillations
  • Low dead time of <20ns minimizes phase voltage distortions
  • Supports high-speed motor control with high PWM frequency
  • Uses low-side current sampling, and adds phase voltage sampling to support verification of sensorless field-oriented control (FOC) or sensorless trapezoidal control
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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.

PDF | HTML
TIDUF86.PDF (2281 K)

Reference design overview and verified performance test data

TIDMDS7.PDF (1306 K)

Detailed schematic diagram for design layout and components

TIDMDS8.PDF (339 K)

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

TIDMDS9.PDF (621 K)

Detailed overview of design layout for component placement

TIDMDT1.ZIP (5006 K)

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

TIDCGV2.ZIP (1070 K)

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

TIDMDT0.PDF (2584 K)

PCB layer plot file used for generating PCB design layout

Technical documentation

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Type Title Date
Design guide 36V, 50A 3-Phase GaN Inverter Reference Design for BLDC Motor Control PDF | HTML Jan. 23, 2025

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