onsemi introduces the NCP1342, a versatile quasi-resonant flyback controller designed for high-performance off-line power converters. This highly integrated solution offers an array of features to optimize power efficiency and minimize acoustic noise during operation.
The NCP1342 incorporates an innovative active X2 capacitor discharge feature, enabling the system to achieve no-load power consumption below 30 mW. This ensures energy efficiency even during periods of low or zero power demand. The controller utilizes proprietary valley-lockout circuitry, ensuring stable valley switching down to the 6th valley. As the load decreases further, the NCP1342 transitions into frequency foldback mode, effectively reducing switching losses.
One of the standout features of the NCP1342 is its quiet-skip mode. When operating under light loads, this mode manages power delivery while minimizing acoustic noise. This is especially beneficial in applications where noise reduction is a critical requirement.
To enhance light load performance in high-frequency designs, the NCP1342 incorporates minimum peak current modulation (MPCM). This enables rapid reduction of the switching frequency, ensuring efficient operation even at lower power levels.
The NCP1342 also prioritizes converter ruggedness by implementing several protective features. Internal brownout detection safeguards against voltage drops, ensuring uninterrupted operation. A non-dissipative over-power protection (OPP) mechanism ensures constant maximum output power regardless of input voltage variations. Furthermore, the controller includes latched overvoltage and NTC-ready over-temperature protection through a dedicated pin. Lastly, line removal detection functionality allows for safe discharge of X2 capacitors when the AC line is disconnected.
In summary, onsemi's NCP1342 is a highly integrated flyback controller designed to optimize power conversion efficiency and minimize acoustic noise. Its active X2 capacitor discharge feature, valley-lockout circuitry, and frequency foldback mode contribute to efficient operation across varying load conditions. The unique quiet-skip mode manages power delivery while reducing acoustic noise, making it ideal for noise-sensitive applications. With additional protective features, the NCP1342 ensures robust and reliable performance in various power converter designs.
Minimum peak current modulation (MPCM) 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
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 an X2 resistor
Extra protection against high-temperature or other fault conditions
Enables faster switching of primary-side MOSFET
Simple implementation of required protection functions
Medium- or high-power AC/DC adapters
Ultra high-density AC/DC adapters
USB-PD compliant
Notebook adapters
Flat TV SMPS
Computer power supplies
Phone and tablet adapters
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