MD1800SBG is a low-cost high-performance PSR (primary-side regulation) monolithic switch power supply controller with digital logic control, specially designed for RCC substitution and low-end phone chargers. Built in 850V power switch tube, maximum power 3W, accurate CV/CC (constant current/constant voltage) digital logic control circuit, which can leave out the opt-coupler from traditional feedback loop circuit, so as TL431 and its related devices.

 MD1800SBG is a design of high integration, which brings power switch tube and a high performance digital control logic circuit integrated into a package, makes all the protection circuits together. Meanwhile, it keeps the peripheral components at minimum and save cost for peripheral systems. MD1800 can be easily designed as a typical flyback switch converter, unique driving technology to promote the withstand voltage of the power tube and achieve excellent conversion efficiency consequently.

MD180X系列原理圖