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Supply and Reclaim (onsemi) NCP1342DADBDGD1R2G quasi-resonant flyback controller Flyback topology 500kHz 9SOIC.

Product introduction

The NCP1342 is a highly integrated quasi-resonant flyback controller for the design of high-performance off-line power converters. The device has an integrated active X2 capacitor discharge capability that enables no-load power consumption of less than 30 MW.

The NCP1342 features a proprietary valley locking circuit to ensure stable valley switching. The system works down to the sixth trough and switches to frequency reentry mode to reduce switching losses. With further load reduction, the NCP1342 enters Quiet−Skip mode to manage power transfer while minimizing noise.

To ensure light load performance for the high frequency design, the NCP1342 integrates fast frequency return-back and minimum peak current modulation to quickly reduce the switching frequency. To help ensure the durability of the converter, the NCP1342 implements several key protection features such as internal power failure detection, non-dissipative overpower protection (OPP), which provides a constant maximum output power regardless of the input voltage, latch overvoltage via a dedicated pin, and NTC-ready overtemperature protection. The line removal detection function is used to safely discharge the X2 capacitor when the AC line is removed.

peculiarity

• Integrated high-voltage starting circuit, with power failure detection function

• Integrated X2 capacitor discharge capability

• Wide VCC range: 9 V to 28 V

•28 V VCC overvoltage protection

• Abnormal overcurrent fault protection for winding short circuit or saturation detection

• Internal temperature off

• Valley switching operation, valley locking, to achieve noise-free operation

• Frequency reentry with minimum frequency clamp of 25 kHz for improved efficiency under light loads

• Fast frequency folding to quickly reduce switching frequency under light load

•SKIP mode uses Quiet−SKIP technology for maximum performance during light loads

• Minimizes current consumption with no load power below 30 MW

• Reduces frequency jitter of EMI features

• Overload protection based on lockout or auto-restore timers

• Adjustable overpower Protection (OPP)

• Adjustable maximum frequency clamp

•FAULT pin for severe fault conditions, NTC compatible with OTP

•4 ms soft start timer

NCP1342DADBDGD1R2G device application circuit

NCP1342 device block diagram

If necessary, please contact Mr. Chen:

Email: sales@hkmjd.com

Company website: www.hkmjd.com