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FAN9611MX Datasheet(PDF) 1 Page - Fairchild Semiconductor

Part # FAN9611MX
Description  Interleaved Dual BCM PFC Controllers
Download  37 Pages
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN9611MX Datasheet(HTML) 1 Page - Fairchild Semiconductor

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April 2011
© 2008 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN9611 / FAN9612 • Rev. 1.1.3
FAN9611 / FAN9612
Interleaved Dual BCM PFC Controllers
Features
Sync-Lock™ Interleaving Technology for 180°
Out-of-Phase Synchronization Under All Conditions
Automatic Phase Disable at Light Load
Dead-Phase Detect Protection
2.0A Sink, 1.0A Source, High-Current Gate Drivers
High Power Factor, Low Total Harmonic Distortion
Voltage-Mode Control with (VIN)2 Feedforward
Closed-Loop Soft-Start with User-Programmable
Soft-Start Time for Reduced Overshoot
Minimum Restart Frequency to Avoid Audible Noise
Maximum Switching Frequency Clamp
Brownout Protection with Soft Recovery
Non-Latching OVP on FB Pin and Latching Second-
Level Protection on OVP Pin
Open-Feedback Protection
Power-Limit and Current Protection for Each Phase
Low Startup Current of 80µA Typical
Works with DC and 50Hz to 400Hz AC Inputs
Applications
100-1000W AC-DC Power Supplies
Large Screen LCD-TV, PDP-TV, RP-TV Power
High-Efficiency Desktop and Server Power Supplies
Networking and Telecom Power Supplies
Solar Micro Inverters
Description
The FAN9611/12 family of interleaved dual Boundary-
Conduction-Mode (BCM) Power-Factor-Correction (PFC)
controllers operate two parallel-connected boost power
trains 180° 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, 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 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 16.5kHz and 525kHz. The Pulse Width
Modulators (PWM) implement voltage-mode control with
input voltage feedforward. 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 controllers offers bias UVLO (10V / 7.5V for
FAN9611 and 12.5V / 7.5V for FAN9612), input
brownout, over-current, open-feedback, 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.
Figure 1. Simplified Application Diagram


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