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