Optimised 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 15V to 55 VDC input in an ultra-compact circular form factor.
At the core of the EPC91118 is the EPC23104 ePower Stage IC, a monolithic GaN IC that facilitates 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 5V and 3.3V power supplies—all on a single board that fits entirely within a 32mm diameter footprint.
“The EPC91118 is a breakthrough for humanoid robotics, shrinking inverter size by 66% vs. silicon while eliminating electrolytic capacitors—thanks to GaN ICs and high-frequency operation,” said Alex Lidow, CEO and Co-Founder of EPC.
Key features:
- 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
- 100kHz 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: 32mm diameter inverter, 55mm diameter external frame
The design was moulded 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.
