NCP1342AMDCDAD1R2G

High Frequency Quasi-Resonant Flyback Controller/ Reel |Onsemi NCP1342AMDCDAD1R2G

NCP1342AMDCDAD1R2G – High-Frequency Quasi-Resonant Flyback Controller – onsemi
Optimize your power supply designs with the NCP1342AMDCDAD1R2G from onsemi—a high-performance quasi-resonant flyback controller engineered for efficiency and reliability. This advanced IC delivers precise power conversion with robust protection features, making it ideal for compact, energy-efficient AC-DC applications. PCX ensures genuine onsemi components with same-day shipping and dedicated technical support.

Key Features

700V Voltage Breakdown rating for enhanced durability
500kHz Switching Frequency enabling compact designs
Wide Operating Voltage (9V–28V) with 17V startup
Comprehensive Fault Protection: Overload, over-temperature, over-voltage, short circuit
Surface-Mount Package: 9-SOIC (3.90mm width)
Industrial Temperature Range: -40°C to 125°C

Technical Details
This isolated flyback controller features a quasi-resonant topology for reduced switching losses and EMI. Key design elements include frequency control for optimized efficiency across loads, soft-start functionality to prevent inrush currents, and no internal switches for flexible external MOSFET pairing. The device operates in isolated topologies, making it suitable for safety-critical applications requiring galvanic separation.

Typical Applications

USB-PD chargers and smartphone adapters
Industrial power supplies and motor controls
LED lighting drivers and smart home devices
Consumer electronics auxiliary power modules
Network equipment and server PSUs

About onsemi
onsemi (Nasdaq: ON) is a global leader in energy-efficient power management and sensor technologies. With over 75,000 products in its portfolio, the company drives innovation in automotive, industrial, and cloud power applications. onsemi’s solutions are renowned for their reliability, efficiency, and compliance with international safety standards.
The company maintains rigorous quality control through vertically integrated manufacturing and extensive testing protocols. onsemi’s commitment to sustainability includes industry-leading initiatives in waste reduction and carbon neutrality, ensuring eco-friendly components for next-generation electronics.

About AC-DC Flyback Controllers
Flyback controllers are essential for offline power conversion, enabling efficient voltage transformation from AC mains to isolated DC outputs. Their quasi-resonant variants minimize switching noise and losses by synchronizing with transformer resonance points, resulting in higher efficiency and reduced electromagnetic interference (EMI). This makes them indispensable for modern power supplies constrained by size and thermal limits.
These ICs provide critical isolation between primary and secondary circuits, protecting sensitive downstream components from voltage surges. Advanced versions like the NCP1342 series integrate