EE16 8+5 Offline Flyback Transformer for AC-DC Switching Power Supply Applications

The EE16/8/5 Offline Flyback Transformer is a magnetics component engineered for primary-side regulated (PSR) flyback converters, operating directly from rectified AC mains (85-265VAC). Its designation specifies the E-core geometry (16mm width, 8mm height, 5mm leg thickness) with an intentional air gap enabling cyclic energy storage and transfer—storing energy during the switch's ON phase and delivering it to the isolated secondary during OFF.

The component's principal innovation lies in its system-level integration capability. By facilitating an optocoupler-free feedback architecture—where voltage regulation is achieved via an auxiliary winding—it transforms from a mere energy-transfer element into a design-simplification engine. This approach yields multiple tangible benefits: a significantly reduced bill of materials (BOM) and PCB footprint, lower overall system cost, and enhanced long-term reliability by eliminating optocoupler aging as a failure mechanism.

Consequently, it serves as a versatile platform for compact, isolated power supplies (typically up to tens of watts). Customization for different output voltages is streamlined, requiring primarily an adjustment to the transformer's turns ratio with minimal peripheral circuit changes. This makes it an optimal choice for cost-sensitive, space-constrained applications—from consumer adapters and IoT sensors to PoE modules—where safety isolation, design simplicity, and field reliability are paramount.