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FPF08S60SN 데이터시트(PDF) 1 Page - Fairchild Semiconductor

부품명 FPF08S60SN
상세설명  Power Factor Correction Converter Design
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홈페이지  http://www.fairchildsemi.com
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© 2010 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.0 • 6/8/10
AN-6982
Power Factor Correction Converter Design with FAN6982
Introduction
The FAN6982 is a 14-pin, Continuous Conduction Mode
(CCM) Power Factor Correction (PFC) controller IC, that
employs leading-edge modulation for average current
control and has a number of advanced features for better
performance and reliability. The variable output voltage
function (range function) reduces PFC output voltage at
light-load and low-line conditions to improve light-load
efficiency, but can be also easily disabled using EN pin.
The RDY signal can be used for power-on sequence
control of the downstream DC/DC converter. A TriFault
Detect™ function helps reduce external components and
provides full protection for feedback loops such as open,
short, and over voltage. FAN6982 also includes PFC soft-
start, peak current limiting, line feed-forward, and input
voltage brownout protection.
This application note describes the theory of operation and
step-by-step design considerations for a power factor
correction power supply using the FAN6982 controller. A
typical application circuit is shown in Figure 1, where the
supply voltage, VDD, is supplied from a standby auxiliary
power supply and the supply voltage for the downstream
converter is controlled by the RDY pin.
IEA
RT/CT
RDY
EN
VRMS
ISENSE
IAC
SGND
OPFC
PGND
VDD
VREF
FBPFC
VEA
FAN6982
Range Enabled/Disabled
VEN =VVREF : Enabled
VEN = GND : Disabled
AC Input
F1
CIF2
LBOOST
DBOOST
CBOOST
Q1
RCS
RRMS1
RRMS2
RRMS3
CRMS1
CRMS2
RLF
CLF
RIAC
RIC
CIC1
CIC2
D1 D2
RDRV
RPL
CDD
RFB2 CFB
RFB1
RVC
CVC1
CVC2
RT
CT
CREF
REN
CRDY
vCC
VBOUT
Downstream
DC/DC Converter
PWM Controller
Q2
Rreg1
Rreg2
Rreg3
VOUT
From Standby Auxiliary Power Supply
CIF1
Figure 1. Typical FAN6982 Application Circuit


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