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.
... show more
