The EVLVIPGAN50FL evaluation board implements a 15 V-50 W SSR isolated flyback converter developed for general purpose application, operating from 90 to 265 VAC. The reference design is built around the VIPERGAN50, a new advanced offline high-voltage converter by STMicroelectronics, having the following features: - 650 V PowerGaN with embedded senseFET (Si) and HV startup; - QR operation with dynamic blanking time and adjustable valley synchronization delay functions, to maximize efficiency at any input line and load condition; - Valley-lock to ensure constant valley skipping; - Input voltage feedforward compensation for mains-independent OPP intervention; - Adaptive burst mode for advanced power management in light load conditions; - Frequency jittering for EMI suppression. Enhanced system reliability is ensured by the built-in soft-start function and by the following set of protections: - Input OVP (settable); - Brown-in and brown-out (settable); - Output OVP (settable); - Output overload; - OCP LEB; - Embedded thermal shutdown. The EVLVIPGAN50FL is composed of a main board and a daughterboard, whose schematics are shown in Figure 1 and Figure 2 respectively. The main board contains, on the primary side, a diode bridge for double wave rectification, an input pi filter for EMI, a flyback transformer, the VIPERGAN50 and all the related components needed for polarization and features setting; on the secondary side, the output capacitors and the output rectifier, realized by a Power MOSFET driven by a synchronous rectifier for efficiency optimization.