PFC/PWM Controller Provides High Efficiency in Dual-Switch Flyback Topologies

Feb 23, 2011 2:23 PM

Fairchild Semiconductor's FAN6920MRis an integrated critical mode PFC and quasi-resonant current mode PWM controller that meets regulatory requirements by providing >90 percent efficiency and <300mW at no load for increased power savings.

The FAN6920MR combines a power factor correction (PFC) controller and a quasi-resonant PWM controller for a cost effective design that uses fewer external components. For PFC, the device uses a controlled on-time technique to provide a regulated DC output voltage and to perform natural power factor correction. With an innovative total harmonic distortion (THD) optimizer, the FAN6920MR can reduce input current distortion at zero-crossing duration to improve THD performance.

For PWM control, the FAN6920MR provides several functions to enhance the power system performance including extended valley detect up to the 12th valley cycle for reduced switching frequency, improved light load efficiency, green-mode operation, an internal 10ms soft start and high/low line over-power compensation.

Additionally, the device provides many protection functions including brownout, secondary-side open-loop and over-current with auto recovery, external auto-recovery protection triggering and internal over-temperature shutdown.

Available in a 16-pin small outline package (SOP), the FAN6920MR is ideal for AIO computers, AC/DC netbook adapters (Slim Pack), open-frame SMPS and battery chargers, as well as LCD TV and LED street lights.

Price: US $00.82 in 1,000 quantity pieces
Availability: Samples available now
Delivery: 8-10 weeks ARO

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