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ON Semiconductor FAN9611 | Demoboard AN-9717

400-W Interleaved Dual-BCM PFC Controller


Topology Power Factor Correction
Input voltage 85-264 V
Output 1 400 V / 1 A
IC revision 0.0.6


The FAN9611 interleaved dual Boundary-Conduction-Mode (BCM) Power-Factor-Correction (PFC) controllers operate two parallel-connected boost power trains 180º outof phase. Interleaving extends the maximum practical power level of the controltechnique from about 300 W to greater than 800 W. Unlike the continuous conductionmode (CCM) technique often used at higher power levels, BCM offers inherent zerocurrentswitching of the boost diodes (no reverse-recovery losses), which permits the useof less expensive diodes without sacrificing efficiency. Furthermore, the input and outputfilters can be smaller due to ripple current cancellation between the power trains anddoubling of effective switching frequency.The advanced line feedforward with peak detection circuit minimizes the output voltagevariation during line transients. To guarantee stable operation with less switching loss atlight load, the maximum switching frequency is clamped at 525 kHz. Synchronization ismaintained under all operating conditions.Protection functions include output over-voltage, over-current, open-feedback, undervoltagelockout, brownout, and redundant latching over-voltage protection. TheFAN9611 is available in a lead-free 16-lead SOIC package.This FAN9611 evaluation board is a four-layer board designed for 400 W (400 V / 1 A)rated power. Thanks to the phase management, the efficiency is maintained above 96% atlow-line and high-line, even down to 10% of the rated output power. Efficiency is 96.4% atline voltage 115 VAC and 98.2% at 230 VAC under full-load conditions.


 Low Total Harmonic Distortion, High Power Factor 180° Out-of-Phase Synchronization Automatic Phase Disable at Light Load 1.8-A Sink, 1.0-A Source, High-Current Gate Drivers Transconductance (gM) Error Amplifier for Reduced Overshoot Voltage-Mode Control with (VIN)2 Feed-forward Closed-Loop Soft-Start with Programmable Soft-Start Time for Reduced Overshoot Minimum Restart Timer Frequency to Avoid Audible Noise Maximum Switching Frequency Clamp Brownout Protection with Soft Recovery Non-Latching OVP on FB Pin and Second-Level Latching Protection on OVP Pin Open-Feedback Protection Over-Current and Power-Limit Protection for Each Phase Low Startup Current: 80 μA Typical Works with DC Input Voltage and 50-Hz to 400-Hz AC Inputs

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