ON Semiconductor NCP1343 Quasi-Resonant Flyback Controllers

ON Semiconductor NCP1343 Quasi-Resonant Flyback Controllers are ideal for designing high-performance off-line power converters. The NCP1343 features a proprietary valley-lockout circuitry, that ensures stable valley switching. This system works down to the 6th valley and transitions to frequency foldback mode to reduce switching losses. The NCP1343 enters quiet-skip mode as the load decreases to manage the power delivery while minimizing acoustic noise.

Features

• Integrated high-voltage startup circuit with brownout detection
• Wide VCC range from 9V to 28V
• 28V VCC overvoltage protection
• Abnormal overcurrent fault protection for winding short circuit or saturation detection
• Internal temperature shutdown
• Valley switching operation with valley-lockout for noise-free operation
• Frequency foldback with 25khz minimum frequency clamp for increased efficiency at light loads
• Rapid frequency foldback for fast reduction of switching frequency at light loads
• Skip mode with quiet-skip technology for highest performance during light loads
• Minimized current consumption for no-load power below 30mw
• Frequency jittering for reduced EMI signature
• Latching or auto-recovery timer-based overload protection
• Adjustable overpower protection (OPP)
• Adjustable maximum frequency clamp
• Ccm operation during power excursion mode (PEM)
• Fault pin for severe fault conditions, NTC compatible for OTP

Block Diagram

more information: https://www.onsemi.com/products/power-management/ac-dc-controllers-regulators/offline-controllers/ncp1343

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