NCP1247 Datasheet | onsemi

Fixed Frequency Current Mode Controller for Flyback Converters The NCP1247 is a new fixed- frequency current- mode controller featuring the Dynamic Self- Supply. This function greatly simplifies the design of the auxiliary supply and the VCC capacitor by activating the internal startup current source to supply the controller during start- up, transients, latch, stand- by etc. This device contains a special HV detector which detect the application unplug from the AC input line and triggers the X2 discharge current. This HV structure allows the brown- out detection as well. It Features a timer- based fault detection that ensures the detection of overload and an adjustable pensation to...