onsemi Unveils High Power Totem Pole PFC Controller

By Joel Davies -

onsemi, a provider of intelligent power and sensing technologies, has introduced the NCP1681, its latest mixed-signal controller dedicated to bridgeless totem pole PFC (TP PFC) topology.

The NCP1681 targets ultra-high-density offline power supplies by building upon the success of the NCP1680, which is suited for designs up to 350 W. The NCP1681 requires a few external components and no coding is needed to be added for a fully-featured TP PFC solution, which is designed to save time, cost and space.

Commenting on the new release, Robert Tong, Senior Vice President & General Manager of Computing and Cloud Division at onsemi said, “The new NCP1681 extends the benefits of code-free TP PFC design into higher power. This allows our customers to continue to enhance the efficiency of their design while reducing design time and cost, thereby delivering solutions to market quickly”.

The NCP1681 can be configured to work in either fixed frequency continuous conduction mode (CCM) or multi-mode operation, where the controller naturally transitions between CCM and critical conduction mode (CrM) for optimal performance across power levels. The new NCP1681 high power TP PFC controller also integrates established control algorithms with novel features, challenging efficiency standards such as “80Plus” or “CoC Tier 2”, which require high efficiency over a wide load range.

The NCP1681 is suited to higher-power power supplies from 350 W to several kilowatts range that operates on universal mains input (90 – 265 Vac), addressing applications including server, high-performance computing, telecom, industrial and OLED TV. At high line, NCP1681 TP PFC solutions will achieve close to 99% efficiency.

Alongside the TP PFC controllers, onsemi offers a range of SiC MOSFETs and isolated gate drivers that can be used for the fast leg of the totem pole. SiC MOSFET devices have low on-resistance (RDS(on)) and a compact chip size which ensures low capacitance and gate charge (Qg), delivering efficiency in a reduced system size, thereby enabling power density. onsemi notes that when the NCP1681 is used with NCP51561 galvanically isolated gate driver, “robust design can be realized without sacrificing switching performance”.

You can find more information about onsemi and the NCP1681 mixed-signal controller on its website.

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