450W Power Factor Controller with Universal Input Voltage Range

This power factor controller accept voltage from 90 to 268 Vac,  that’s why we call it power factor controller with universal input, since any standards of mains supply  in almost any country would fall within that range. This power factor controller is capable of handling up to 450W load. Here is the schematic diagram of the power factor controller circuit:

Don’t think this circuit is complex because most of what you see in the schematic diagram  is the internal circuitry of  MC34262  power factor controller integrated circuit chip.  You can replace the IC with MC33262 for higher operating ambient temperature range, -40 to 105 Celsius degree, much better then MC34262 chip that has the ambient operating temperature range of 0-85 Celsius degree.

Transformer:

Coilcraft P3657–A
Primary: 38 turns Litz wire, 1300 strands of #48 AWG, Kerrigan–Lewis, Chicago, IL
Secondary: 3 turns of # 20 AWG
Core: Coilcraft PT4220, EE 42–20
Gap: 0.180? total for a primary inductance (LP) of 190 µH

Heatsink:

AAVID Engineering Inc. 604953B04000 Extrusion.

[Schematic diagram source: Motorola Analog IC Device Data]