NCP1681 Description
1 FAULT bined OVP/OTP fault pin. 2 PFCOK The PFCOK pin is held low when the PFC output voltage is out of regulation and during fault condi- tions. The pin bees active when the PFC output achieves regulation in nominal operation, sourc- ing a current proportional to the feedback voltage, VFB.
NCP1681 Key Features
- Totem Pole PFC Topology Eliminates Input Diode Bridge Enabling
- AC Line Monitoring Circuit & AC Phase Detection
- Brownout Detection
- Digital Loop pensation
- Novel Current Sensing Scheme Providing Inductor Current Upslope
- PFCOK Indicator
- Skip/Standby Mode for Optimizing Light Load Performance
- Near-Unity Power Factor in All Operating Modes
- Continuous Conduction Mode (CCM) in Heavy-Load Conditions
- Critical Conduction Mode (CrM) in Light & Medium Load