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NCP1239 Dataheets PDF



Part Number NCP1239
Manufacturers ON Semiconductor
Logo ON Semiconductor
Description Fixed Frequency Current-Mode Controller
Datasheet NCP1239 DatasheetNCP1239 Datasheet (PDF)

DATA SHEET www.onsemi.com Fixed Frequency Current‐Mode Controller for Flyback Converter NCP1239 The NCP1239 is a fixed-frequency current-mode controller featuring a high-voltage start-up current source to provide a quick and lossless power-on sequence. This function greatly simplifies the design of the auxiliary supply and the VCC capacitor by activating the internal start-up current source to supply the controller during start-up, transients, latch, stand-by etc. With a supply range up to 35 V.

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