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FAN9611 Datasheet(PDF) 3 Page - Fairchild Semiconductor

No. de pieza FAN9611
Descripción Electrónicos  Dual BCM PFC Controller
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Fabricante Electrónico  FAIRCHILD [Fairchild Semiconductor]
Página de inicio  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN9611 Datasheet(HTML) 3 Page - Fairchild Semiconductor

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3
FEB279_FAN9611/12 • Rev. 0.0.2
The following user guide supports the FAN9611/12 400W evaluation board for
interleaved boundary-conduction-mode power-factor-corrected supply. It should be used
in conjunction with the FAN9611/12 datasheet as well as the Fairchild application note
AN-6086 Design Considerations for Interleaved Boundary-Conduction Mode PFC using
FAN9612. Although marked FAN9612, the evaluation board can be interchangeably used
to evaluate either the FAN9611 (10V turn-on threshold) or FAN9612 controller (12.5V
turn-on threshold). Please visit Fairchild’s website at www.fairchildsemi.com for
additional information.
1. Overview of the Evaluation Board
The FAN9611/12 interleaved dual Boundary-Conduction-Mode (BCM) Power-Factor-
Correction (PFC) controllers operate 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 smaller due to ripple current cancellation between the power trains and
doubling of effective switching frequency.
The advanced line feedforward with peak detection circuit minimizes the output voltage
variation during line transients. To guarantee stable operation with less switching loss at
light load, the maximum switching frequency is clamped at 525kHz. Synchronization is
maintained under all operating conditions.
Protection functions include output over-voltage, over-current, open-feedback, under-
voltage lockout, brownout, and redundant latching over-voltage protection. The
FAN9611/12 is available in a lead-free 16-lead SOIC package.
This FAN9611/12 evaluation board is a four-layer board designed for 400W (400V/1A)
rated power. Thanks to the phase management, the efficiency is maintained above 96%
at low-line and high-line, even down to 10% of the rated output power. Efficiency is
96.4% at line voltage 115VAC and 98.2% at 230VAC under full-load conditions.


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