NCP1239 Overview
Pin Name Description 1 Fault The controller enters fault mode if the voltage of this pin is pulled above or below the fault thresholds. A precise pull up current source allows direct interface with an NTC thermistor. Fault detection triggers a latch.
NCP1239 Key Features
- Fixed-Frequency 65-kHz or 100-kHz Current-Mode Control
- Frequency Foldback Down to 26 kHz and Skip Mode to Maximize
- Adjustable Over Power Protection (OPP) Circuit
- High-Voltage Current Source with Brown-Out (BO) Detection
- Internal Slope pensation
- Internal Fixed Soft-Start
- Frequency Jittering in Normal and Frequency Foldback Modes
- 64-ms Timer-Based Short-Circuit Protection with Auto-Recovery or
- Pre-Short Ready for Latched OCP Versions
- Latched OVP on VCC
NCP1239 Applications
- AC-DC Converters for TVs, Set-Top Boxes and Printers
- Offline Adapters for Notebooks and Netbooks