Summary of ON SEMICONDUCTOR NCP1343 QUASI-RESONANT FLYBACK CONTROLLERS
The NCP1343 is a quasi-resonant flyback controller designed for high-performance offline power converters. It features valley-lockout circuitry for stable switching down to the 6th valley, frequency foldback to reduce losses, and quiet-skip mode to minimize acoustic noise at light loads. The chip includes integrated startup circuits, brownout detection, overvoltage protection, and temperature shutdown, ensuring efficiency and reliability with low no-load power consumption below 30mW.
Parts used in the NCP1343 Quasi-Resonant Flyback Controller:
- Proprietary valley-lockout circuitry
- Integrated high-voltage startup circuit
- Brownout detection system
- Wide VCC range (9V to 28V)
- 28V VCC overvoltage protection
- Abnormal overcurrent fault protection
- Internal temperature shutdown
- Frequency foldback mechanism
- Quiet-skip technology
- Frequency jittering module
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
Read more: ON SEMICONDUCTOR NCP1343 QUASI-RESONANT FLYBACK CONTROLLERS
- What is the primary function of the NCP1343?
It is ideal for designing high-performance off-line power converters. - How does the system ensure stable valley switching?
It uses proprietary valley-lockout circuitry that works down to the 6th valley. - Can the NCP1343 operate at very low power levels?
Yes, it minimizes current consumption for no-load power below 30mw. - Does the controller help reduce acoustic noise?
Yes, it enters quiet-skip mode as the load decreases to manage power delivery while minimizing acoustic noise. - What happens during frequency foldback mode?
The system transitions to this mode to reduce switching losses and clamp the minimum frequency at 25khz. - How is EMI reduced in this design?
Frequency jittering is used to reduce the EMI signature. - What protections are included against winding faults?
There is abnormal overcurrent fault protection for winding short circuit or saturation detection. - Is there thermal protection built into the chip?
Yes, it includes an internal temperature shutdown feature.
