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This literature is subject to all applicable copyright laws and is not for resale in any manner.FAN9611 Interleaved Dual BCM PFC Controllers February 2013 FAN9611 Interleaved Dual BCM PFC Controllers Features Description The FAN9611 interleaved dual Boundary-Conduction- Sync-Lock Interleaving Technology for 180 Mode (BCM) Power-Factor-Correction (PFC) controller Out-of-Phase Synchronization Under All Conditions operates two parallel-connected boost power trains 180 Automatic Phase Disable at Light Load out of phase. Interleaving extends the maximum practical Dead-Phase Detect Protection power level of the control technique from about 300 W to greater than 800 W. Unlike the continuous conduction 2.0 A Sink, 1.0 A Source, High-Current Gate Drivers mode (CCM) technique often used at higher power High Power Factor, Low Total Harmonic Distortion levels, BCM offers inherent zero-current switching of the 2 Voltage-Mode Control with (V ) Feedforward IN boost diodes, which permits the use of less expensive diodes without sacrificing efficiency. Furthermore, the Closed-Loop Soft-Start with User-Programmable input and output filters can be smaller due to ripple Soft-Start Time for Reduced Overshoot current cancellation and effective doubling of the Minimum Restart Frequency to Avoid Audible Noise switching frequency. Maximum Switching Frequency Clamp The converters operate with variable frequency, which is Brownout Protection with Soft Recovery a function of the load and the instantaneous input / Non-Latching OVP on FB Pin and Latching Second- output voltages. The switching frequency is limited Level Protection on OVP Pin between 16.5 kHz and 525 kHz. The Pulse Width Modulators (PWM) implement voltage-mode control with Open-Feedback Protection input voltage feedforward. When configured for PFC Power-Limit and Current Protection for Each Phase applications, the slow voltage regulation loop results in Low Startup Current of 80 A Typical constant on-time operation within a line cycle. This PWM method, combined with the BCM operation of the boost Works with DC and 50 Hz to 400 Hz AC Inputs converters, provides automatic power factor correction. Applications The controller offer bias UVLO of 10 V / 7.5 V, input brownout, over-current, open-feedback, output over- 100-1000 W AC-DC Power Supplies voltage, and redundant latching over-voltage protections. Large Screen LCD-TV, PDP-TV, RP-TV Power Furthermore, the converters output power is limited independently of the input RMS voltage. Synchronization High-Efficiency Desktop and Server Power Supplies between the power stages is maintained under all Networking and Telecom Power Supplies operating conditions. Solar Micro Inverters Related Resources Evaluation Board: FEBFAN9611 S01U300A Figure 1. Simplified Application Diagram 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN9611 Rev. 1.1.7