S4226MB is a switchable color temperature control chip with state memory function. The internal state switching window time Tsw (typical value is 6.4S) is set. If the light-off time exceeds the state switching window time, the chip will remember the state before turning off the light. When turning on the light next time, the state before turning off the light will be directly presented. If the light-off time is less than the state switching window time and then turning on the light, it will switch to the next color temperature state, increasing the convenience of use. S4226MB has two built-in 400V thyristors, which simplifies the peripheral circuit structure. It judges the on/off state by detecting pulse signals to ensure logical consistency when multiple power supplies are applied simultaneously. Moreover, it can be compatible with multiple LED driving schemes such as Flyback, Buck-Boost, Buck and linear.