onsemiNCP1342: Quasi-Resonant Flyback Controller交流至直流交换转换器

With an integrated active X2 capacitor discharge feature, the NCP1342 can enable no-load power consumption below 30 mW.

The NCP1342 features proprietary valley-lockout circuitry, ensuring stable valley switching. This system works down to the 6th valley and transitions to frequency foldback mode to reduce switching losses. As the load decreases further, the NCP1342 enters quiet-skip mode to manage the power delivery while minimizing acoustic noise.

To ensure light load performance with high frequency designs, the NCP1342 incorporates Minimum Peak Current Modulation (MPCM) to reduce the switching frequency quickly. To help ensure converter ruggedness, the NCP1342 implements several key protective features such as internal brownout detection, a non-dissipative Over Power Protection (OPP) for constant maximum output power regardless of input voltage, a latched overvoltage and NTC-ready overtemperature protection through a dedicated pin, and line removal detection to safely discharge the X2 capacitors when the ac line is removed.

Features:

• Minimum Peak Current Modulation for Rapid Frequency Foldback (RFF)
• QR Frequency Jittering
• Quiet-Skip Technology
• Integrated HV Startup with Brownout Protection
• 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

Benefits:

• Fast reduction of switching frequency for improved light load efficiency
• Reduces EMI Signature
• Ensures Operation Outside Audible Range
• Provides an efficient power-on source and protects against drops in input mains voltage
• Maximizes the efficiency over the entire power range
• Eliminates the need for a X2 resistor
• Extra protection against high temperature or other fault conditions
• Enables faster switching of primary-side MOSFET
• Simple implementation of required protection functions

Applications:

• Medium or High Power AC-DC Adapters
• Ultra High Density AC-DC Adapters
• USB PD Compliant

End Products:

• Notebook Adapters
• Flat TV SMPS
• Computer Power Supplies
• Phone and Tablet Adapters

Evaluation Boards:

NCP1342PD45WGEVB: NCP1342 45 W USB PD Evaluation Board

The NCP1342PD65WGEVB showcases the NCP1342 Quasi-Resonant Flyback Controller in a USB Power Delivery (PD) application. The evaluation board delivers 45W of power using a compact RM8 transformer. The NCP1342 is suitable for designing high-performance off-line power converters and USB PD adapters, and features Rapid Frequency Foldback (RFF) for improved efficiency over the load range. An integrated active X2 capacitor discharge feature eliminates discharge resistors which enables no-load power consumption below 40 mW.

NCP1342PD65WGEVB: NCP1342 60 W USB PD Evaluation Board

The NCP1342PD65WGEVB showcases the NCP1342 Quasi-Resonant Flyback Controller in a USB Power Delivery (PD) application. The evaluation board delivers 60W of power using a compact RM8 transformer. The NCP1342 is suitable for designing high-performance off-line power converters and USB PD adapters, and features Rapid Frequency Foldback (RFF) for improved efficiency over the load range. An integrated active X2 capacitor discharge feature eliminates discharge resistors which enables no-load power consumption below 40 mW.

NCP1342PD90WGEVB: NCP1342 90 W USB PD Evaluation Board

The NCP1342PD65WGEVB showcases the NCP1342 Quasi-Resonant Flyback Controller in a USB Power Delivery (PD) application. The evaluation board delivers 90W of power using a compact RM8 transformer. The NCP1342 is suitable for designing high-performance off-line power converters and USB PD adapters, and features Rapid Frequency Foldback (RFF) for improved efficiency over the load range. An integrated active X2 capacitor discharge feature eliminates discharge resistors which enables no-load power consumption below 40 mW.

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