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NCP1246 Datasheet Fixed Frequency Controller

Manufacturer: onsemi

Overview: NCP1246 Product Preview Fixed Frequency Current Mode Controller for Flyback Converters The NCP1246 is a new fixedïfrequency currentïmode controller featuring the Dynamic SelfïSupply. 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 startïup, transients, latch, standïby 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 brownïout detection as well.

Key Features

  • a timerïbased 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 standby power consumption. Internal frequency jittering, ramp compensation, and a versatile latch input make this controller an excellent candidate for the robust power supply designs. A dedicated Off mode al.

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