This document introduces an application of a high power factor flyback LED driver based on the L6562A and TSM101 controllers. The driver uses isolated feedback with an optocoupler and a secondary side reference/error amplifier, the TSM101, for voltage and current regulation. The L6562A is a PFC controller operating in transition-mode, with a highly linear multiplier that reduces AC input current distortion and allows wide-range mains operation with extremely low THD. The TSM101 compares the DC voltage and current level of a switching power supply to an internal reference, providing feedback to the L6562A controller. This system, designed using the L6562A and TSM101 controllers, offers advantages in terms of output current and voltage stability.