PFC/PWM controller targets power engineers

The controller targets power engineers, especially those involved in All-In-One (AIO) PC power, Slim Pack PC adapters, LCD TV and LED lighting designs, who require a dual switch flyback topology that provides the higher efficiency and increased energy savings required by government regulations.

The FAN6920MR meets these requirements by providing more than 90 per cent efficiency and less than 300mW at no load for increased power savings.

It 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 a total harmonic distortion (THD) optimiser, 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 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 suitable for AIO computers, AC/DC netbook adapters (Slim Pack), open-frame SMPS and battery chargers, as well as LCD TV and LED street lights.