摘要
Unlocking the full potential of gallium nitride (GaN)-based rectifiers requires precise dead-time management, ensuring zero-voltage switching (ZVS) turn-on and zero-current switching (ZCS) turn-off. The proposed monolithic accurate on / off synchronous rectifier (SR) control (AOSC) improves dead-time precision and improves current sensing to minimize power loss in a 380-12-V LLC resonant flyback converter. The tri-enhancement GaN driver (TGD), incorporating three key advancements, achieves an ultra-fast switching delay of less than 3 ns, enabling rapid turn on/off of the GaN-based rectifier. Additionally, the error-eliminated GaN sensor (EGS) provides precise current sensing with a sub-1% error margin, ensuring accurate rectifier turn-off timing. This enables ZCS operation and integrates on-chip overcurrent protection (OCP). Moreover, the zero-crossing GaN detector (ZGD) compensates for controller delays, effectively minimizing reverse conduction losses. As a result, the proposed design achieves a high step-down ratio and an outstanding efficiency of 97.1%.