S4525S is a chip dedicated to switchable color temperature adjustment. The chip has two built-in 400V thyristors, simplifying the peripheral circuit structure. Adopting high-voltage technology, the HV pin has a built-in high-voltage JFET for power supply, without the need for an external power supply resistor and VDD capacitor. The signal detection pin CLK has a built-in high-voltage resistor detection network (only one protection resistor needs to be added on the periphery), which is easy to be compatible with switching power supply applications such as Flyback, Buck or Buck-Boost, providing convenience for power supply design.