Light-Load Efficiency Power Factor Controller

On Semiconductor NCP1602 6-pin Enhanced, Light-Load Efficiency Power Factor Corrected (PFC) Controller optimizes PFC boost stage efficiency across a load range. The NCP1602 controller is designed using the innovative Valley Synchronized Frequency Foldback (VSFF) method. The VSFF method maximizes efficiency for nominal and light loads. Using the VSFF method, the circuit operates in Critical conduction Mode (CrM) if the control voltage exceeds a programmable value. This method reduces the stand-by losses. Similar to FCCrM controllers, the NCP1602's internal circuitry enables near-unity power factor even when the switching frequency is reduced.

The NCP1602 Power Factor Controller is ideally suited for applications in which reliability, low stand−by power, and high efficiency are key considerations.

Features

Near−Unity Power Factor
Two−Level Boost Follower Line Level Dependent
Critical Conduction Mode (CrM)
Valley Synchronized Frequency Fold−back (VSFF): Low Frequency Operation is Forced at Low Current Levels (9 pre−programmed settings)
Works With or Without a Transformer w/ ZCD Winding (simple inductor)
On−time Modulation to Maintain a Proper Current Shaping in VSFF Mode
Fast Line / Load Transient Compensation (Dynamic Response Enhancer)
Valley Turn−on
High Drive Capability: −500mA / +800mA
Vcc Range from 9.5V to 30V
High Vcc Start−up level: (17.0V)
Line Range Detection for Reduced Crossover Frequency Spread

Safety Features

Thermal Shutdown
Non−latching, Overvoltage Protection
Second Overvoltage Protection

Brown−Out Detection
Over Current Limitation
Disable Protection if the Feedback Pin is Not Connected
Low Duty−Cycle Operation if the Bypass Diode is Shorted
Open Ground Pin Fault Monitoring

Applications

PC Power Supplies
Lighting Ballasts (LED, Fluorescent)
Flat TV
All Off Line Appliances Requiring Power Factor Correction

Application Schematic
On Semiconductor NCP1602 Power Factor Controller Application Schematic

Block Diagram
On Semiconductor NCP1602 Power Factor Controller Block Diagram

Valley Synchronized Turn−on Block Diagram
On Semiconductor NCP1602 Power Factor Controller Valley Synchronized Turn−on Block Diagram

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