High-Efficiency Single Stage Power Factor Correction and Step-Down Controller

The NCP1652 is a highly integrated controller for implementing power factor correction (PFC) and isolated step down ac−dc power conversion in a single stage, resulting in a lower cost and reduced part count solution. This controller is ideal for notebook adapters, battery chargers and other off−line applications with power requirements between 75 W and 150 W. The single stage is based on the flyback converter and it is designed to operate in continuous conduction (CCM) or discontinuous conduction (DCM) modes.

FEATUREs
•Dual Control Outputs with Adjustable Non Overlap Delay for Driving a Synchronous Rectifier Switch, an Active Clamp Switch or Both
•Voltage Feedforward Improves Loop Response
•Frequency Jittering Reduces EMI Signature
•Proprietary Soft−Skip™at Light Loads Reduces Acoustic Noise
•Brown Out Detector
•Internal 150 ms Fault Timer
•Independent Latch−Off Input Facilitates Implementation of Overvoltage and Overtemperature Fault Detectors
•Single Stage PFC and Isolated Step Down Converter
•Continuous or Discontinuous Conduction Mode Operation
•Average Current Mode Control (ACMC), Fixed Frequency Operation
•High Accuracy Multiplier Reduces Input Line Harmonics
•Adjustable Operating Frequency from 20 kHz to 250 kHz
•These are Pb−Free Devices

Typical Applications
•Notebook Adapter
•High Current Battery Chargers
•Front Ends for Distributed Power Systems
•High Power Solid State Lighting