February 14, 2022
PHOENIX – Feb.14, 2022 onsemi (Nasdaq: ON), a leader in intelligent power and sensing technologies, is pleased to announce that the market-leading NCP1680 critical conduction mode (CrM) bridgeless totem pole power factor correction (PFC) controller has been awarded a PowerBest award by Electronic Design. These awards include a very limited number of electronic power products that help engineers create winning designs and celebrate the people who helped make them possible, despite (another) incredibly challenging year in 2021.
The NCP1680 from onsemi received the award because its unique implementation of bridgeless totem pole PFC using a mixed-signal controller gives designers an excellent tool to improve efficiency and reduce the cost and design complexity of high performance power supplies. The controller is ideally suited for use in ultra-high-density offline power supplies that operate with universal mains (90-265 Vac) at power levels of up to 350 W.
The bridgeless totem pole PFC topology eliminates the diode bridge present at the input of a conventional PFC circuit that account for around 4 W of losses in conventional PFC circuits used in a 240-W power supply (i.e., roughly 20% of total losses), significantly improving power-stage efficiency. The NCP1680 provides control signals for a fast-switching leg driven at the pulse-width-modulation (PWM) switching frequency and a second leg that operates at the ac-line frequency. The controller can be used with nearly any switching device, from conventional super junction silicon MOSFETs to Wide Bandgap devices based on silicon carbide (SiC) or gallium nitride (GaN) transistors.
The NCP1680 simplifies the design of bridgeless totem pole PFC by employing a novel current-limiting architecture and line phase-detection mechanism. Its control loop supports a constant-on-time CrM architecture with valley switching. To meet today's global efficiency standards for light-load operation, it operates in discontinuous conduction mode (DCM) with valley-synchronized turn-on during frequency fold back operation.
Just a few simple components are required externally to realize a fully-featured totem pole PFC, thereby saving space and component cost. Further reducing component count, the cycle-by-cycle current limit is realized without the need for a Hall Effect sensor.
Housed in a SOIC-16 package, the NCP1680 is also available as part of an evaluation platform that allows rapid development and debugging of advanced totem pole PFC designs.
Additional resources & documents:
Blog: Industry’s First Intelligent Mixed Signal Bridgeless Totem-Pole PFC Controller Solves the AC-DC Power Supply Efficiency Challenge
安森美（纳斯达克股票代码：ON）一直在推动颠覆性创新的路上孜孜以求，努力打造更美好的未来。公司专注于汽车和工业终端市场，目前正加速变革，拥抱大趋势的转变，包括汽车电汽化和汽车安全、可持续能源网、工业自动化以及5G和云基础设施等。安森美的智能电源和感知技术，以高度差异化的创新产品组合，助力解决全球最复杂的挑战和难题，引领创建一个更加安全、 清洁、智能的世界。安森美是《财富》美国500强（Fortune 500®）和标普500指数（S&P 500®）企业。访问www.onsemi.cn了解关于安森美的更多内容。
安森美和安森美图标是Semiconductor Components Industries, LLC的注册商标。所有本文中出现的其它品牌和产品名称分别为其相应持有人的注册商标或商标。虽然公司在本新闻稿提及其网站，但此稿并不包含其网站中有关的信息。