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onsemi

 

onsemi NCP1680 CRM PFC Controller IC

The onsemi NCP1680 is a CRM PFC controller IC designed to drive the bridgeless totem-pole PFC topology. Featuring a topology which eliminates the diode bridge present at the input of a conventional PFC circuit, the bridgeless totem-pole PFC greatly improves power stage efficiency.

The NCP1680 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.

 

Features

  • 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 25 kHz Minimum Frequency
  • Skip Mode in Very Light Load Condition
  • Proprietary Current Sense Scheme
  • Digital Voltage Loop Compensation
  • AC Line Monitoring Circuit & AC Phase Detection
  • Near Unity Power Factor in All Operating Modes
  • PFC OK Indicator

Benefits

  • Enables High Efficiency & Compact Design
  • Optimized Performance Across Power Levels
  • Optimized Performance Across Power Levels
  • Prevents Operation in Audible Range Complies with Energy Efficiency Regulatory Standards
  • Cycle-by-Cycle Current Limit Without Hall Effect Sensor
  • Simplifies Design & Reduces External Components
  • Simplifies Design & Reduces External Components
  • Complies with Energy Efficiency Regulatory Standards
  • Allows Communication with Downstream Converter to Optimize System Performance

 

Applications

  • Power Factor Correction
  • Offline Power Supply

End Products

  • Industrial Power Supplies
  • Telecom 5G Power
  • Networking Power
  • Gaming Console Power Supplies
  • UHD TV Power Supplies
  • Computing Power Supplies