Features

• Valley Synchronized Frequency Fold−back (VSFF):

♦ CrM at Heavy Load

♦ DCM at Light Load by Dead Time Control

♦ Valley Switching in Both CrM and DCM

• On−time Modulation for High PFC in Both CrM and DCM

• Follower Boost Capability (NCP1623A Only)

♦ Lowered Output Voltage Regulation at Low Line

♦ High−Efficient Boost Stage and Downsized Inductor Design

• Skip Mode for Light Load Regulation

• Sleep Mode with Low Current Consumption (SOIC8 Only)

• Fast Line / Load Transient Control

♦ Dynamic Response Enhancer at Output Undershoot

♦ Soft OVP and Fast OVP at Output Overshoot

• Excessive Current Protection

♦ Over Current Protection (OCP)

♦ Over Stress Protection (OVS)

• Brown Out Protection

• Second Over Voltage Protection (OVP2)

• These are Pb−Free Devices

Typical Applications

• USB−PD

• Flat TV

• Industrial Power Supplies

• All Off−line Appliances Requiring Power Factor Correction