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NCP1247 - Fixed Frequency Controller

General Description

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.

Key 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 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.

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Datasheet Details

Part number NCP1247
Manufacturer onsemi
File Size 1.89 MB
Description Fixed Frequency Controller
Datasheet download datasheet NCP1247 Datasheet

Full PDF Text Transcription for NCP1247 (Reference)

Note: Below is a high-fidelity text extraction (approx. 800 characters) for NCP1247. For precise diagrams, and layout, please refer to the original PDF.

NCP1247 Fixed Frequency Current Mode Controller for Flyback Converters The NCP1247 is a new fixed−frequency current−mode controller featuring the Dynamic Self−Supply. Thi...

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equency 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 compensation to help keep the maximum power indepe

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