The front-stage BOOST PFC controller and the rear-stage LLC resonant half-bridge controller are integrated into a single chip, achieving a highly integrated design. 

Silergy's PFC+LLC solution： SY5055 series combination controller. This solution integrates the front‑stage BOOST PFC controller and the rear‑stage LLC resonant half‑bridge controller into a single chip, achieving a highly integrated design. It adopts a compact SOP16 package, supports high‑voltage startup and X‑capacitor discharge functions, delivers standby power consumption below 100 mW, and provides comprehensive protection mechanisms.