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NCP1239 Fixed Frequency Current-Mode Controller

NCP1239 Description

DATA SHEET www.onsemi.com Fixed Frequency Current‐Mode Controller for Flyback Converter NCP1239 The NCP1239 is a fixed-frequency current-mode control.
Pin No.

NCP1239 Features

* a timer-based fault detection circuitry that ensures a quasi-flat overload detection, independent of the input voltage. Features
* Fixed-Frequency 65-kHz or 100-kHz Current-Mode Control Operation
* Frequency Foldback Down to 26 kHz and Skip Mode to Maximize Performance in Light Load

NCP1239 Applications

* AC-DC Converters for TVs, Set-Top Boxes and Printers
* Offline Adapters for Notebooks and Netbooks SOIC
* 7 CASE 751U PIN CONNECTIONS Fault 1 FB 2 CS 3 GND 4 8 HV 6 VCC 5 DRV MARKING DIAGRAM 8 1239xfff ALYWX G 1 1239xfff x A L Y W G = Specific Device Code = A, B, C, D

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Fixed Frequency Current-Mode Controller ON Semiconductor
ON Semiconductor NCP1239-like datasheet