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FQPF13N50C データシート(PDF) 2 Page - Fairchild Semiconductor

部品番号 FQPF13N50C
部品情報  Power Factor Correction Converter Design
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メーカー  FAIRCHILD [Fairchild Semiconductor]
ホームページ  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FQPF13N50C データシート(HTML) 2 Page - Fairchild Semiconductor

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AN-6982
APPLICATION NOTE
© 2010 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.0 • 6/8/10
2
Functional Description
Widely used operation modes for the boost converter are
continuous conduction mode (CCM) and boundary
conduction mode (BCM). These two descriptive names
refer to the current flowing through the energy storage
inductor of the boost converter, as depicted in Figure 2.
The inductor current in CCM is continuous; while in BCM,
the new switching period is initiated when the inductor
current returns to zero, which is at the boundary of
continuous conduction and discontinuous conduction
operations. CCM PFC is commonly used for high-power
applications above 300W since the inductor current has a
small ripple and higher power factor can be obtained than
BCM operation. Due to the reverse-recovery current of the
output diode, using a high-speed diode with a small reverse
recovery current is crucial to achieve high efficiency and
low EMI.
Figure 2. CCM vs. BCM Control
Current and Voltage Control of PFC
As shown in Figure 3, the FAN6982 employs two control
loops for power factor correction: a current-control loop
and a voltage-control loop. The current-control loop shapes
inductor current, as shown in Figure 4, such that voltage
drop across the internal resistor RM should be same as the
averaged voltage drop across the sensing resistor, RCS,
during one switching cycle:
0
()
S
T
LCS
MO
M
S
I Rdt
I
R
T
1
⋅=
(1)
where the internal resistor RM is typically 5.7kΩ; the
output current of gain modulator, IMO, is given as a
function of input current of IAC pin; and voltages of the
VRMS and VEA pins are calculated as:
2
10.5 (
- 0.7)
(- 0.7)
EA
MO
AC
MAX
RMS
EA
V
II
VV
×
(2)
Figure 3. Current and Voltage Control
Feedback Circuit
M
MO
CS
R
I
R
=⋅
Figure 4. Operation Waveforms of CCM PFC
The voltage-control loop regulates PFC output voltage
using an internal error amplifier such that the FBPFC
voltage is same as the internal reference of 2.5V. Note that,
from Equation (2), the voltages of VEA should be almost
constant to obtain pure sinusoidal reference for the input
current shaping. Because there is always twice the line
frequency ripple in the PFC output voltage, a narrow
bandwidth should be used for the output voltage-control
loop to minimize the line frequency ripple. Otherwise, the
control loop tries to remove the output voltage ripple,
changing the error amplifier output voltage as shown in
Figure 5, which causes distortion of the input current.


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