Fairchild minimizes power losses in multi-stage power supplies

San Jose, Calif.—Fairchild Semiconductor has developed a CCM PFC controller for 300W to 2kW power supply designs that bring high system efficiency, high power factor and low total harmonic distortion (THD). Through its high level of integration, this CCM PFC controller eliminates 54 external components.

Fairchild's CCM PFC controller, the FAN6982, reaches near unity with 0.999 of PF (power factor) at full load. With this, utility companies do not have to supply as much power to electronic applications. With power factor controllers like Fairchild's FAN6982, AC harmonic currents resulting from today's complex loads can be virtually eliminated, thereby allowing for a more efficient power distribution system.

Fairchild's FAN6982 maintains high system efficiency at light load conditions to meet 20 percent load system efficiency requirements of ENERGY STAR regulations and Climate Savers Computing Initiatives. It achieves this by reducing capacitive switching losses and by reducing the voltage conversion ratio, which results in less conduction losses in the boost switch.

Features of the CCM PFC controller are: built-in brown-out protection, eliminating 12 components; adjustable PFC output, eliminating 17 components; RDY pin for power-on-sequence, eliminating 15 components; 30V operating voltage capability, eliminating 10 components; and PFC soft-start, eliminating four components.

Since many AC-sourced electronic applications have a microphone, amplifier or loudspeaker, which need an accurate reproduction of sound, this controller offers low Total Harmonic Distortion (4.6 percent at full load), which reduces these harmonics and meets class D requirements of IEC 1000-3-2. The FAN6982 does this through its switching-charge technology that senses input current and voltage directly, helping to improve PF and THD.

Pricing: $0.69 in 1,000 quantity pieces.
Availability: Samples available now; delivery: 8 weeks ARO.
Datasheet: Click here.

Fairchild Semiconductor, www.fairchildsemi.com