NCP1680AAD1R2G

NCP1680 is a CRM PFC controller IC designed to drive the bridgeless totem-pole PFC topology. The bridgeless totem-pole PFC is a power factor correction architecture that consists of a fast switching leg driven at the PWM switching frequency and a second leg that operates at the AC line frequency. This topology eliminates the diode bridge present at the input of a conventional PFC circuit, allowing significant improvement in the power stage efficiency. It enables high efficiency and compact design. Provides optimized performance across power levels and optimized performance across power. Prevents operation in audible range. Applications includes power factor correction, offline power supply, industrial power supplies, telecom 5G power. networking power, gaming console power supplies, UHD TV power supplies and computing power supplies.

• Totem pole PFC topology eliminates input diode bridge
• Critical conduction mode (CRM) operation
• Discontinuous conduction mode (DCM) with valley turn on Under Light Load Condition
• Frequency foldback in DCM with 25KHz minimum frequency
• Skip mode in very light load condition
• Proprietary current sense scheme, digital voltage loop compensation
• AC line monitoring circuit and AC phase detection
• Near unity power factor in all operating modes
• PFC OK indicator, complies with energy efficiency regulatory standards
• Cycle-by-cycle current limit without hall effect sensor