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NCP1246 - Fixed Frequency Controller

Description

Pin No 1 2 3 4 5 6 Pin Name LATCH FB CS GND DRV VCC Function LatchïOff Input Feedback + Shutdown pin Current Sense ï Drive output VCC input Pin Description Pull the pin up or down to latchïoff the controller.

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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Datasheet preview – NCP1246

Datasheet Details

Part number NCP1246
Manufacturer ON Semiconductor
File Size 1.24 MB
Description Fixed Frequency Controller
Datasheet download datasheet NCP1246 Datasheet
Additional preview pages of the NCP1246 datasheet.

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Full PDF Text Transcription

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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. It 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.
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