NCP1681AAD2R2G

NCP1681 is a totem pole continuous conduction mode (CCM)/multi-mode (CrM-CCM) power factor correction controller. It is a 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. Typical applications are power factor correction, offline power supply, server power, telecom 5G power, networking power, gaming console power supplies, UHD TV power supplies, industrial power supplies.

• Totem pole PFC topology eliminates input diode bridge, SOIC20 NB less pin 17 and 19 package
• Frequency foldback in DCM with 25kHz minimum frequency
• Skip mode in very light load condition, novel current sense scheme, PFC OK indicator
• Digital voltage loop compensation, AC line monitoring circuit and AC phase detection
• Enables high efficiency and compact design, optimized efficiency for high power design
• Optimized performance across power levels, prevents operation in audible range
• Complies with energy efficiency regulatory standards, simplifies design/reduces external components
• Cycle-by-cycle current limit without hall effect sensor
• Complies with energy efficiency regulatory standards
• Allows communication with downstream converter to optimize system performance