The XT4202A6 is a constant current LED regulator which applies to single stage step-down power factor corrected LED drivers.XT4202A6 series integrates high voltage power source, and can be supplied by line voltage directly, auxiliary winding and VCC capacitor are not needed. Patented current sensing and digital compensation technics ensure a unit power factor and high accuracy output current. The critical conduction mode operation reduces the switching losses and increases the efficiency.XT4202A6 series has multi-protection functions which largely enhance the safety and reliability of the system, including LED open protection, LED short protection, VIN over voltage protection and over-temperature protection.