onsemi NCP1680 PFC controller

The NCP1680 Critical Conduction Mode (CRM) Totem Pole Power Factor Correction (PFC) controller employs novel current limit architecture and line phase detection while incorporating proven control algorithms to deliver a cost-effective Totem Pole PFC solution without compromising on performance.

The bridgeless architecture 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.

Key features

• Totem pole PFC topology eliminates input diode bridge
• Discontinuous Conduction Mode (DCM) with valley turn on under light load condition
• Digital voltage loop compensation
• Frequency foldback in DCM with 25 kHz minimum frequency

Additional features

• Skip mode in very light load condition
• Proprietary current sense scheme
• AC line monitoring circuit & AC phase detection
• The near-unity power factor in all operating modes
• PFC OK indicator

Applications

• Offline Power Supply
• Industrial Power Supplies
• Computing Power Supplies
• Networking Power Supplies
• Gaming Console Power Supplies
• Telecom 5G Power Supplies
• Power Factor Correction