The NCP1606 is an active power factor controller specifically designed for use as a pre−converter in electronic ballasts, ac−dc adapters and other medium power off line converters (typically up to 300 W). It embeds a Critical Conduction Mode (CRM) scheme that substantially exhibits unity power factor across a wide range of input voltages and power levels. Housed in a DIP8 or SOIC−8 package, the NCP1606 minimizes the number of external components. Its integration of comprehensive safety protection features makes it an excellent driver for rugged PFC stages.

General Features
• “Unity” Power Factor
• No Need for Input Voltage Sensing
• Latching PWM for Cycle by Cycle On Time Control (Voltage Mode)
• High Precision Voltage Reference (±1.5% over the VCC and Temp. Ranges)
• Very Low Startup Current Consumption (≤ 40 uA)
• Low Typical Operating Current (2.1 mA)
• −500 mA / +800 mA Totem Pole Gate Driver
• Undervoltage Lockout with Hysteresis
• Pin to Pin Compatible with Industry Standards

Safety Features
• Programmable Overvoltage Protection
• Protection against Open Loop (Undervoltage Protection)
• Accurate and Programmable On Time Limitation
• Overcurrent Limitation

Typical Applications
• Electronic Light Ballast
• AC Adapters, TVs, Monitors
• All Off Line Appliances Requiring Power Factor Correction