NCP1244 Datasheet - ON Semiconductor

NCP1244 Fixed Frequency Controller

Pin No Pin Name Function 1 LATCH Latch *Off Input 2 FB Feedback + Shutdown pin 3 CS Current Sense 4 GND 5 DRV 6 VCC * Drive output VCC input 8 HV High *voltage pin Pin Description Pull the pin up or down to latch *off the controller. An internal current sourc.

NCP1244 Fixed Frequency Current Mode Controller for Flyback Converters The NCP1244 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 unpl.

NCP1244 Features

* a timer

* based fault detection that ensures the detection of overload and an adjustable compensation to help keep the maximum power independent of the input voltage. Due to frequency foldback, the controller exhibits excellent efficiency in light load condition while still achieving very low

NCP1244_ONSemiconductor.pdf