ON Semiconductor NCP1342 is a highly integrated quasi-resonant flyback controller

The NCP1342 is a highly integrated quasi-resonant flyback controller suitable for designing high-performance off-line power converters. The integrated X2 capacitor-discharge feature enables the NCP1342 to achieve no-load power consumption below 30 mW.

The controller features proprietary valley-lockout circuitry, ensuring stable valley switching, and includes key protection features for AC-DC power supply applications.

Key features

• QR frequency jittering for optimized EMI behavior
• Quiet-Skip technology to ensure operation outside the audible range
• Frequency foldback with 25 kHz min frequency clamp for the highest light load efficiency
• Integrated HV Startup with brownout protection

Additional features

• Valley switching operation with valley lockout
• Integrated X2 capacitor-discharge capability
• NTC-compatible fault pin
• High drive capability: -500 mA/+800 mA
• Latch input for OVP and OTP implementation

Applications

• Medium or high power AC-DC adapters
• Ultra-high-density AC-DC adapters
• Low/medium power USB PD adapters
• Notebook computer adapters

more information: https://www.onsemi.com/ncp1342