First three-channel interleaved CCM PFC controller

Designers of high power applications, such as air conditioner power supplies, need power factor correction (PFC) to improve power factor (PF) and harmonics to avoid deteriorating the power grid. Unlike other solutions that provide two or less channel capabilities with fewer features, the FAN9673 can easily switch between one-, two- or three-channels with good phase management.

The device also features a simple differential current sensing resistor and configurable output voltage control, enabling an easy, compact, cost-effective design for high power PFC applications up to 9 kW. It is suitable for use in applications such as high power AC/DC power supplies, DC motor power supplies, white goods e.g. air conditioner power supplies, server and telecomms power supplies, uninterruptible power supplies and industrial welding power supplies.

Additional features include three channel PFC control, programmable operation frequency of 18-40 or 55-75kHz, two type current limit function, and TriFault detect functionality which protects against feedback loop failure.

DH Cho, Vice President, Power Conversion, Fairchild, comments: "Fairchild is committed to understanding customer needs and developing power solutions that are best for that individual customer. By listening to what our customers needed, we developed the FAN9673 to help designers improve the stability and efficiency of their designs, while at the same time reducing cost and saving board space."

The FAN9673 three-channel interleaved CCM PFC controller from Fairchild Semiconductor is priced at $3.45 (USD) each in 1,000 unit quantities. Samples are available upon request and delivery is 6-10 weeks ARO.