FAN9612

PRELIMINARY FAN9612 — Interleaved Dual BCM PFC Controller www.DataSheet4U.com February 2009 FAN9612 Interleaved Dual BCM PFC Controller Features ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ Low Total Harmonic Distortion, High Power Factor 180° Out of Phase Synchronization Automatic Phase Disable at Light Load 1.8A Sink, 0.8A Source, High Current Gate Drivers Trans-conductance (gM) Error Amplifier Voltage-Mode Control with (VIN) Feed Forward Closed-Loop Soft-Start with User-Programmable Soft-Start Time for Reduced Overshoot Minimum Restart Timer Frequency to Avoid Audible Noise Maximum Switching Frequency Clamp Brown-Out Protection with Soft-Recovery Non-Latching OVP on FB pin and Latching Second Level Protection on OVP Pin Open Feedback Protection Over-Current & Power-Limit Protection for Each Phase Low Start-Up Current of 80-µA Typical Works with DC, 50Hz to 400Hz ac Inputs 2 Description The FAN9612 Interleaved Dual Boundary-ConductionMode (BCM) Power-Factor-Correction Controller operates two parallel-connected boost power trains 180º out of phase. Interleaving extends the maximum practical power level of the control technique from about 300W to greater than 800W. Unlike the continuous conduction mode (CCM) technique often used at higher power levels, BCM offers inherent zero-current switching of the boost diodes (no reverse-recovery losses), which permits the use of less expensive diodes without sacrificing efficiency. Furthermore, the input and output filters can be made sma...