Efficient Power Conversion Corporation (EPC) introduces the EPC91118, the first commercially available reference design to integrate gallium nitride (GaN) IC technology for humanoid robot motor joints. Optimized for space-constrained and weight-sensitive applications such as humanoid limbs and compact drone propulsion, the EPC91118 delivers up to 15 ARMS per phase from a 15 V to 55 V DC input in an ultracompact circular form factor.
At the heart of the EPC91118 is the EPC23104 ePower Stage IC, a monolithic GaN IC that enables higher switching frequencies and reduced losses. The GaN-based power stage is combined with current sensing, a rotor shaft magnetic encoder, a microcontroller, RS485 communications, and 5 V and 3.3 V power supplies— all on a single board that fits entirely within a 32 mm diameter footprint.
Key Features of the EPC91118 Evaluation Board: • 15 ARMS per phase drive capability for 3-phase BLDC motors • Integrated current and voltage sensing with high-resolution encoder for rotor position • RS485 protocol support for real-time communication • 100 kHz PWM frequency with 50 ns dead time • Fully integrated board including controller, sensing, and power conversion • MLCC-only DC link reduces size and enhances reliability • Dimensions: 32 mm diameter inverter, 55 mm diameter external frame
The design was shaped to fit seamlessly inside humanoid joint motors, enabling low-profile, high-efficiency motion control. The high switching frequency enabled by GaN allows the use of compact multi-layer ceramic capacitors (MLCCs) rather than bulkier electrolytic capacitors, contributing to a lower profile and higher reliability design.
With a 66% smaller footprint compared to traditional silicon MOSFET implementations, the EPC91118 sets a new standard in motor drive integration for emerging robotics and drone markets.
For detailed technical specifications, schematics, and to request a sample, visit the EPC91118 product page.
The EPC91118 reference design boards are priced at $394.02. The EPC23104 is priced at $2.69/ea in 3Ku reels. Reference design boards and devices are available for immediate delivery from Digi-Key.
