ON Semiconductor introduces innovative Ultra high density off-line power solutions

     On Semiconductor, which promotes high -energy innovation, has launched the industry's first special critical communication mode (CRM) totem pillar PFC controller, which is a new member of the company's ultra -high -density offline power solution set.

     In the traditional PFC circuit, the loss of the rectifier bridge diode in the 240 W power supply is about 4 W, accounting for about 20%of the total loss. In contrast, the energy efficiency of the PFC class is usually 97%, and the LLC circuit achieves similar performance. However, the switch configured with the "totem column" is replaced by the diode with losses, and the pFC function is pulled in, which can reduce the loss of the bridge and significantly improve the overall energy efficiency. In addition, NCP1680 can be suitable for any switch type, whether it is a super -silicon MOSFET or a silicon carbide (SIC) or nitride (GAN).

     The new NCP1680 CRM totem pillar PFC controller uses a novel current limit architecture and line phase detection. At the same time, combined with the verified control algorithm, it provides a cost -effective totem pillar PFC solution without affecting performance. The core of the IC is internal compensation digital circuit control. This innovative device uses a constant -direction time CRM architecture with a valley -containing bottom switch. Due to the built -in non -continuous guide mode (DCM), the bottom of the valley is synchronized during the frequency return work, it can meet the modern energy efficiency standards, including those standards that require high energy efficiency under light load.

     This highly integrated device can work for power design at a recommended power level of up to 350 W under the general power supply (90 to 265 VAC). Under the 230 VAC power input, the PFC circuit based on the NCP1680 can achieve nearly 99% of the energy efficiency in 300 W. Only a few simple devices are required to achieve full -featured totem pillars PFC, thereby saving space and device costs. Further reduce the number of devices and achieve cyclical current limit, without the need for Hall effect sensor.

     NCP1680 is encapsulated with small SOIC-16, which can also be used as part of the evaluation platform to support rapid development and debugging advanced totem pillars PFC design.

     According to the totem column switch technology, including the high -speed half -bridge and the low -speed semi -bridge. Among them, on the high -speed semi -bridge. MOSFET door driver is used together. NCP51561 is an isolated dual -channel door pole driver with 4.5 A source current and 9 A irrigation pilot peak capacity. The new device is suitable for the fast switch of silicon power MOSFET and SIC -based MOSFET devices, which provides short and matching transmission delays. Two independent 5 KVRMS (UL1577) electrical isolation door drive channels can be used as two lower bridges, two upper bridge switches, or a half -bridge drive, which has a programmable dead area. One enable pin will turn off two outputs at the same time, and NCP51561 provides other important protection functions, such as the independent underwriting lock (UVLO) and the enable function for the two door drives.

     ON Semiconductor offers a wide range of SIC MOSFETs, which provides high energy efficiency than Silicon MOSFET. Low -conductors (RDS (ON)) and small chip size ensure low -capacitance and door electrode charge (QG) to provide the highest energy efficiency in smaller system size, thereby increasing power density. Anson Micro Semiconductor has been released with 650 V SIC MOSFET encapsulated to TO-247-4L and D2PAK-7L, and will continue to increase the product series. In addition, Ansonmei semiconductor provides a complete silicon -based 650 V Superfet III MOSFET product portfolio.