Power Factor Controller for Compact and Robust, Continuous Conduction Mode Pre−Converters
●The NCP1654 is a controller for Continuous Conduction Mode (CCM) Power Factor Correction step−up pre−converters. It controls the power switch conduction time (PWM) in a fixed frequency mode and in dependence on the instantaneous coil current. Housed in a DIP8 or SO8 package, the circuit minimizes the number of external components and drastically simplifies the PFC
●implementation. It also integrates high safety protection features that make the NCP1654 a driver for robust and compact PFC stages like an effective input power runaway clamping circuitry.
●Features
●•IEC1000−3−2 Compliant
●•Average Current Continuous Conduction Mode
●•Fast Transient Response
●•Very Few External Components
●•Very Low Startup Currents (<75 A)
●•Very Low Shutdown Currents (< 400 A)
●•Low Operating Consumption
●•±1.5 A Totem Pole Gate Drive
●•Accurate Fully Integrated 65 kHz Oscillator
●•Latching PWM for cycle−by−cycle Duty−Cycle Control
●•Internally Trimmed Internal Reference
●•2 versions of Undervoltage Lockout with Hysteresis
●•Soft−Start for Smoothly Startup Operation (B version only)
●•Shutdown Function
●Safety Features
●•Inrush Currents Detection
●•Overvoltage Protection
●•Undervoltage Detection for Open Loop Detection (shutdown)
●•Brown−Out Detection
●•Soft−Start
●•Accurate Overcurrent Limitation
●•True Overpower Limitation
●Typical Applications
●•TV, Monitors, PC Desktop SMPS
●•AC Adapters SMPS
●•White Goods, other Off−line SMPS
