Design high-efficiency solar optimisers with GaN FETs

Designed to deliver high reliability while addressing critical challenges in energy efficiency and cost-effectiveness through the reduction of passive components in solar energy systems, the EPC9178 demonstrates the transformative potential of GaN technology for renewable energy solutions.

The EPC9178 reference design employs a back-to-back buck-boost converter topology, ensuring optimal energy harvesting for each solar panel, even under challenging conditions such as shading. This compact, high-performance solution bridges the gap between micro-inverters and string inverters, offering enhanced energy efficiency and compatibility with existing infrastructure.

EPC9178 key features

The EPC9178 combines cutting-edge GaN technology with an advanced, dedicated controller to deliver unmatched performance and reliability.

• Compact Design: High-frequency operation at 450 kHz minimises the size of passive components, resulting in a lightweight and space-saving solution.
• High Efficiency: Achieves up to 98% peak efficiency, reducing power losses and improving thermal management.
• Advanced GaN Technology: Powered by 100 V-rated EPC2306 eGaN FETs, the EPC9178 offers low on-resistance (3.8 mΩ) and reduced switching losses compared to silicon MOSFETs.
• Simplified Control: Integrated LM5177 controller from Texas Instruments reduces design complexity and component count.
• Versatile Output Settings: Operates across an input voltage range of 30 V to 60 V, with selectable output voltages of 30 V, 45 V, and 60 V.

"The EPC9178 delivers a compact, high-performance, and reliable design that enables cost-effective solar energy systems," said Alex Lidow, CEO of EPC.

Price and availability

The EPC9178 evaluation boards are priced at $480.00

The EPC2306 is priced at $1.87/ea in 3Ku reels.