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The NCP4304A and NCP4304B, manufactured by ON Semiconductor, are advanced controllers and drivers designed to optimize synchronous rectification in high-efficiency switch mode power supplies (SMPS). These versatile components are suitable for various topologies, including flyback, forward, and half-bridge resonant LLC converters. Featuring an externally adjustable minimum on and off times, the NCP4304A/B effectively mitigates ringing caused by PCB layout and parasitic elements, ensuring reliable and noise-free operation. The components boast an extremely low turn-off delay time of typically 40 ns, high sink current capability, and an automatic package parasitic inductance compensation system, which together maximize the conduction time of the synchronous rectification MOSFET, thereby enhancing SMPS efficiency. The NCP4304A offers a gate drive clamp of 12 V, while the NCP4304B provides a 6 V clamp, facilitating implementation in 24 V output applications. Key features include precise secondary zero current detection with an adjustable threshold, a maximum operating frequency of 500 kHz, and a low startup and standby current consumption. The devices are available in SOIC-8 and DFN8 packages, making them suitable for high power density AC/DC power supplies, notebook adapters, gaming consoles, and other applications demanding high efficiency.

The NCP1345, manufactured by onsemi, is a highly integrated quasi-resonant flyback controller optimized for high-performance off-line USB-PD and USB Type-C power converters. This advanced controller features a dual-pin Vcc architecture for simplified Vcc management and enhanced performance, allowing direct connection to the auxiliary winding. It incorporates a precise primary side-based output current limiting circuit to ensure a constant output current limit irrespective of the programmed output voltage or nameplate output power. The quasi-resonant (QR) current-mode flyback stage is equipped with proprietary valley-lockout circuitry for stable valley switching down to the 6th valley and transitions to frequency foldback mode to reduce switching losses. Additional load decreases trigger the NCP1345 to enter skip mode for efficient power management. Key protective features include internal brownout detection, maximum output current limit, latched overvoltage, and NTC-ready overtemperature protection, as well as line removal detection for safe discharge of X2 capacitors. The NCP1345 is available in SOIC-9 NB packages and supports various configurations and protection mechanisms, making it a robust solution for modern power supply designs.