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FCA20N60 Scheda tecnica(PDF) 3 Page - Fairchild Semiconductor

Il numero della parte FCA20N60
Spiegazioni elettronici  PFCPWM Combination Controller
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Produttore elettronici  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FCA20N60 Scheda tecnica(HTML) 3 Page - Fairchild Semiconductor

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AN-8027
© 2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.0 • 8/26/09
3
ISENSE
IAC
VRMS
VEA
IEA
R
M
R
M
R
RMS1
R
RMS2
R
RMS3
C
RMS1
C
RMS2
R
IAC
I
AC
V
IN
I
L
R
CS1
R
F1
C
F1
I
MO
R
IC
C
IC1
C
IC2
+
-
Drive logic
OPFC
2.5V
R
VC
R
VC1
R
VC2
FBPFC
R
FB1
R
FB2
V
O
VREF
Figure 5. Gain Modulation Block
I
AC
I
L
1
M
MO
CS
R
I
R
Figure 6. Inductor Current Shaping
The voltage control loop regulates PFC output voltage
using internal error amplifier such that the FBPFC voltage
is same as internal reference of 2.5V.
Brownout Protection
FAN480X has a built-in internal brownout protection
comparator monitoring the voltage of the VRMS pin. Once
the VRMS pin voltage is lower than 1.05V (0.9V for
FAN4802L), the PFC stage is shutdown to protect the
system from over current. The FAN480X starts up the
boost stage once the VRMS voltage increases above 1.9V
(1.65V for FAN4802L).
Two-Level PFC Output
To improve system efficiency at low AC line voltage and
light load condition, FAN480X provides two-level PFC
output voltage. As shown in Figure 7, FAN480X monitors
VEA and VRMS voltages to adjust the PFC output voltage.
When VEA and VRMS are lower than the thresholds, an
internal current source of 20
µA is enabled that flows
through RFB2, increasing the voltage of the FBPFC pin.
This causes the PFC output voltage to reduce when 20
µA
is enabled, calculated as:
12
22
2
(2 5 20
)
+
×
FB
FB
OPFC
FB
FB
RR
V. -
μAR
R
(5)
It is typical to set the second boost output voltage as
340V~300V.
Figure 7. Block of Two-Level PFC Output
Oscillator
The internal oscillator frequency of FAN480X is
determined by the timing resistor and capacitor on RT/CT
pin. The frequency of the internal oscillator is given by:
1
0.56
360
OSC
TT
T
f
R CC
=
⋅⋅
+
(6)
Because the PWM stage of FAN480X generally uses a
forward converter, it is required to limit the maximum duty
cycle at 50%. To have a small tolerance of the maximum
duty cycle, a frequency divider with toggle flip-flops is
used, as illustrated in Figure 8. The operation frequency of
PFC and PWM stage is one quarter (1/4) of the oscillator
frequency. (For FAN4800C and FAN4802/2L, the
operation frequencies for PFC and PWM stages are one
quarter (1/4) and one half (1/2) of the oscillator frequency,
respectively).
The dead time for the PFC gate drive signal is determined
by the equation:
360
DEAD
T
tC
=
(7)
The dead time should be smaller than 2% of switching
period to minimize line current distortion around line zero
crossing.
RT/
CT
VREF
OSC
TQ
T-FF
T
Q
OPWM (FAN4800C, FAN4802/2L)
OPFC, OPWM
T-FF
Figure 8. Oscillator Configuration


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