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This literature is subject to all applicable copyright laws and is not for resale in any manner.FAN9612 Interleaved Dual BCM PFC Controllers February 2013 FAN9612 Interleaved Dual BCM PFC Controllers The FAN9612 interleaved dual Boundary-Conduction- Features Mode (BCM) Power-Factor-Correction (PFC) controller operates two parallel-connected boost power trains 180 Sync-Lock Interleaving Technology for 180 out of phase. Interleaving extends the maximum practical Out-of-Phase Synchronization Under All Conditions power level of the control technique from about 300 W to Automatic Phase Disable at Light Load greater than 800 W. Unlike the continuous conduction Dead-Phase Detect Protection mode (CCM) technique often used at higher power levels, BCM offers inherent zero-current switching of the 2.0 A Sink, 1.0 A Source, High-Current Gate Drivers boost diodes, which permits the use of less expensive High Power Factor, Low Total Harmonic Distortion diodes without sacrificing efficiency. Furthermore, the 2 Voltage-Mode Control with (V ) Feedforward IN input and output filters can be smaller due to ripple current cancellation and effective doubling of the Closed-Loop Soft-Start with User-Programmable switching frequency. Soft-Start Time for Reduced Overshoot Minimum Restart Frequency to Avoid Audible Noise The converter operates with variable frequency, which is a function of the load and the instantaneous input / Maximum Switching Frequency Clamp output voltages. The switching frequency is limited Brownout Protection with Soft Recovery between 16.5 kHz and 525 kHz. The Pulse Width Non-Latching OVP on FB Pin and Latching Second- Modulators (PWM) implement voltage-mode control with Level Protection on OVP Pin input voltage feedforward. When configured for PFC applications, the slow voltage regulation loop results in Open-Feedback Protection constant on-time operation within a line cycle. This PWM Power-Limit and Current Protection for Each Phase method, combined with the BCM operation of the boost Low Startup Current of 80 A Typical converters, provides automatic power factor correction. Works with DC and 50 Hz to 400 Hz AC Inputs The controller offers bias UVLO of 12.5 V / 7.5 V, input brownout, over-current, open-feedback, output over- Applications voltage, and redundant latching over-voltage protections. Furthermore, the converters output power is limited 100-1000 W AC-DC Power Supplies independently of the input RMS voltage. Synchronization Large Screen LCD-TV, PDP-TV, RP-TV Power between the power stages is maintained under all operating conditions. High-Efficiency Desktop and Server Power Supplies Networking and Telecom Power Supplies Solar Micro Inverters Description Figure 1. Simplified Application Diagram 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN9612 Rev. 1.1.7