PFC controller maximizes energy in multi-kW systems

PFC controller maximizes energy in multi-kW systems

Two-phase single-chip interleaving power factor controller simplifies design, increases energy performance and system reliability

The UCC28070 single-chip interleaved PFC control circuit targets multi-kilowatt communications, server, and industrial systems. The two-phase, average current-mode controller helps simplify power design, increase system reliability, and achieve a greater than 0.9 power factor rating.

The device offers continuous conduction-mode control and supports applications from high-end communications systems to embedded white-goods motor drives in refrigerators and air conditioners to high-intensity-discharge (HID) lighting ballasts. In line-operated systems with power levels from 75 W to 1 kW, it helps reduce total harmonic distortion to maximize usable outlet power and accommodate extreme variations and disturbances in various ac line voltage levels.

The controller allows light-load phase management to achieve higher efficiency over the entire load range. Phase management allows a system to turn on or off phases of the power supply, so only those required to power the load are enabled. In a 1.2-kW system the controller can initiate a 1.5% efficiency increase at a 20% load condition, and in a 240-W supply at 20% load condition it initiates 27% power savings. The device allows designers to exceed energy guidelines set by such industry initiatives as The Green Grid, Climate Savers Computing Initiative, and Project Big Green. ($2.45 ea/100 — volume production January 2008.)

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