DESCRIPTION
The TK75003 is a simple primary side controller optimized for off-line switching power supplies including power factor correctors. It is suitable for both voltage-mode and current mode control and has advanced features not available in controllers with a higher pin count. The key to full functionality in a 5-pin design is that the current signal and the error signal are added together and fed into the feedback pin.

FEATURES
■ Power Factor Correction/Line Harmonics Reduction to Meet IEC1000-3-2 Requirements
■ Optimized for Off-Line Operation
■ Maximum Duty Ratio 88% (typ.)
■ Frequency Reduction for Improved Overcurrent Protection
■ Low Standby Current for Current-Fed Start-Up
■ Current-Mode or Voltage-Mode Control
■ Internal User-Adjustable Slope Compensation
■ Functionally Integrated & Simplified 5-Pin Design

APPLICATIONS
■ Power Factor Correction Converters
■ Off-Line Power Supplies
■ Industrial Power Supplies
■ Telecom Power Supplies
■ Off-Line Battery Chargers