Eval Board Simplifies GaN-Based BLDC Motor-Drive Design

Why It Matters

The EPC91121 accelerates GaN‑based motor‑drive development, lowering time‑to‑market and component costs for high‑performance electromechanical products.

Key Takeaways

• EPC91121 delivers 70 A peak, 50 A RMS at 18‑30 V
• Built around 40‑V EPC2366 Gen 7 eGaN FET with 0.84 mΩ Rds(on)
• Supports 150 kHz PWM, enabling smaller magnetic components
• Integrated gate drivers, monitoring, and protection simplify prototyping
• Priced at $335 with full design files available online

Pulse Analysis

Gallium‑nitride (GaN) power transistors are reshaping high‑frequency motor‑drive design by offering ultra‑low on‑resistance and fast switching. EPC's new EPC91121 board showcases these advantages, pairing a 0.84 mΩ EPC2366 Gen 7 eGaN FET with a compact layout that keeps dv/dt under 10 V/ns. The result is a highly efficient inverter capable of 150 kHz PWM, which reduces the size of inductors and capacitors while cutting switching losses—critical factors for drones, robotics and portable power tools where weight and efficiency are paramount.

Beyond raw performance, the board’s integrated gate drivers, voltage and temperature monitoring, and current‑sense protection create a turnkey platform for engineers. Precise phase and DC‑bus sensing support sophisticated control algorithms such as field‑oriented control (FOC) and space‑vector PWM, delivering smoother torque and lower acoustic noise. The 40‑pin controller interface aligns with major MCU families from Microchip, Renesas, STMicroelectronics and Texas Instruments, allowing rapid firmware migration and reducing development overhead.

From a market perspective, the $335 price point and inclusion of full design assets lower the barrier to entry for startups and OEMs experimenting with GaN technology. As supply chains stabilize and GaN production scales, boards like the EPC91121 are likely to become reference designs, driving broader adoption across industrial automation and consumer‑grade electromechanical devices. Early adopters can leverage the platform to differentiate products with higher power density, longer battery life, and quieter operation, positioning themselves competitively in a fast‑moving sector.