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FAN9612MX Scheda tecnica(PDF) 1 Page - Fairchild Semiconductor |
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FAN9612MX Scheda tecnica(HTML) 1 Page - Fairchild Semiconductor |
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1 / 37 page  February 2009 © 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN9612 • Rev. 0.9.1E PRELIMINARY FAN9612 Interleaved Dual BCM PFC Controller Features 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) 2 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 Applications 100-1000W Off-line Power Supplies Large Screen LCD-TV, PDP-TV, RP-TV Power High-End Desktop PC and Server Power Supplies 80-PLUS Certified Equipment Description The FAN9612 Interleaved Dual Boundary-Conduction- Mode (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 smaller due to ripple current cancellation and effective doubling of the switching frequency. The converters operate with variable frequency which is a function of the load and the instantaneous input / output voltages. The switching frequency is limited between 18kHz and 600kHz. The Pulse Width Modulators implement voltage-mode control with input voltage feed forward. When configured for PFC applications, the slow voltage regulation loop results in constant on-time operation within a line cycle. This PWM method combined with the BCM operation of the boost converters provides automatic power factor correction. The FAN9612 offers bias UVLO, input brown-out, input over-voltage, over-current, open feedback, over- temperature, output over-voltage and redundant latching over-voltage protections. Furthermore, the converters’ output power is limited independently of the input RMS voltage. Synchronization between the power stages is maintained under all operating conditions. The FAN9612 is available in Lead(Pb)-Free 16-lead SOIC package. Simplified Application Diagram |
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