onsemi NCP1342 flyback controller

Quasi-resonant flyback controller with valley lock-out switching

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 audible range
• Frequency fold back with 25 kHz min frequency clamp for the highest light load efficiency
• Integrated HV Sstartup 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

 

Available tools

• NCP1342 45 W USB PD Evaluation Board
  • NCP1342PD45WGEVB
• NCP1342 60 W USB PD Evaluation Board
  • NCP1342PD65WGEVB

ebv content library/npi/2021/onsemi-ncp1342 onsemi NCP1342 Flyback Controller | EBV Elektronik