NCP1050, NCP1051, NCP1052, NCP1053, NCP1054, NCP1055 are monolithic high voltage regulators that enable the final product equipment to conform to low voltages Standby power requirements.These devices are offered in an economical 8-pin dual plug-in and 4-pin SOT-223 package. The device family combines the required converter capabilities to provide a simple and economical power system solution for office automation, consumer and industrial products.
Representative block diagram
These devices are designed to operate directly from the rectifying AC line source. In flyback converter applications, they are capable of providing 6.0 W to 40w output power with fixed AC input of 100v, 115 V or 230v, 3.0 W to 20w output power, and variable AC input range of 85 V to 265 V.
The device family features an active start voltage regulator circuit that eliminates the need for auxiliary bias windings on converter transformers, a fault detector and programmable timer for converter overload protection, a unique gated oscillator configuration, extremely fast loop response with double pulse suppression, power switch current limiting, input undervoltage lock, thermal shutdown, and automatic restart fault detection.
Timing diagram of dual edge PWM gated oscillator
