onsemi NCP1623ADR2G, PFC Controller

The ON Semiconductor NCP series of a controller designed to drive PFC boost stages which is based on an innovative valley synchronized frequency fold back method, it operates in critical conduction mode until the power drops below a threshold level. The PFC controller enters discontinuous conduction mode with increased dead-time as the load further decay. It maximizes the efficiency at both nominal and light loads.

Maximizes the efficiency at both nominal and light loads
Simplifies PFC inductor design, eliminates auxiliary winding
Zero current detection via drain sensing