Measuring 79x80mm, the EPC91121 is engineered for rapid prototyping of advanced motor drive architectures in applications such as drones, robotics, industrial automation, handheld power tools and other compact electromechanical systems where high efficiency and power density are critical.
The EPC91121 is a complete three-phase inverter solution capable of delivering up to 70Apeak (50 ARMS) output current from input voltages ranging between 18V and 30V, making it ideal for battery-powered systems operating around a 24V supply. Designed for rapid prototyping and evaluation, the board integrates the key functions required for a motor drive inverter, including gate drivers, housekeeping power supplies, voltage and temperature monitoring, and current sensing.
High-bandwidth current sensing on all three phases supports measurements up to ±125A, while phase and DC-bus voltage sensing provide the feedback needed for precise monitoring and advanced motor-control techniques such as field-oriented control and space-vector PWM.
Additional features include shaft encoder and Hall-sensor interfaces and multiple test points, simplifying system integration, measurement and debugging during development.
At the heart of the design is the 40V EPC2366 Gen 7 eGaN fet, featuring ultra-low on-resistance of 0.84mΩ, enabling extremely efficient power conversion and fast switching performance. The evaluation platform supports PWM switching frequencies up to 150kHz, significantly higher than typical silicon-based motor drives. This capability allows engineers to reduce magnetic component size, minimise switching losses and improve overall system responsiveness.
“With the EPC91121, engineers can evaluate high-frequency GaN-based three-phase inverter designs while leveraging integrated sensing and control interfaces for advanced motor control,” said Marco Palma, director, motor drives systems and applications at EPC.
The board’s layout ensures low-distortion switching, reducing motor acoustic noise and torque ripple while controlling dv/dt to below 10V/ns for stable operation and improved electromagnetic compatibility. For rapid development, the board features a 40-pin controller interface compatible with platforms from Renesas, Microchip, Texas Instruments and STMicroelectronics, allowing engineers to leverage existing motor-control ecosystems.
Complete design support files, including schematic, bill of materials and Gerber files, are available on the EPC91121 product page.
The EPC91121 reference design board is priced at $335.
Reference design boards and devices are available for immediate delivery from Digi-Key and Mouser.
