New from Fairchild Semiconductor is a boundary conduction mode (BCM) interleaving power factor correction (PFC) controller that provides over 96% power conversion efficiency for AC-DC power supplies.
Applications include power supplies for digital TVs, desktop and entry-level server computers, front-end telecom systems and industrial power systems rated from 100 W to 1000 W.
Historically, the high-efficiency, low-cost BCM PFC converters are limited to about 300 W maximum power level, but interleaving extends the power range of BCM control while ripple current cancellation minimises high peak currents. By interleaving and keeping two power stages precisely at 180° out of phase timing under all operating conditions, the FAN9612 lowers conduction losses. By interleaving the power trains, the device is also able to reduce the input filter size and reduce board space.
The device features automatic phase disable to operate with only one channel under light load conditions, as well as an input voltage feed-forward function that minimises output voltage variation versus line voltage. A programmable closed-loop soft-start minimises output voltage overshoot at startup. The IC incorporates input brownout protection, line OVP (over-voltage protection), two-level output OVP, and over-current and power limit protection for each channel.
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