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NCP1239 - Fixed Frequency Current-Mode Controller

General Description

Pin No.

The controller enters fault mode if the voltage of this pin is pulled above or below the fault thresholds.

precise pull up current source allows direct interface with an NTC thermistor.

Key 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 Conditions.
  • Adjustable Over Power Protection (OPP) Circuit.
  • High-Voltage Current Source with Brown-Out (BO) Detection.
  • Internal Slope Compensation.
  • Internal Fixed S.

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Datasheet Details

Part number NCP1239
Manufacturer onsemi
File Size 416.32 KB
Description Fixed Frequency Current-Mode Controller
Datasheet download datasheet NCP1239 Datasheet

Full PDF Text Transcription for NCP1239 (Reference)

Note: Below is a high-fidelity text extraction (approx. 800 characters) for NCP1239. For precise diagrams, and layout, please refer to the original 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-...

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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, the controller hosts a jittered 65 or 100-kHz switching circuitry operated in peak current mode control. When the power on the secondary side starts to decrease, the controller automatically folds back its switching frequency dow

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