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AN4149 데이터시트(PDF) 13 Page - STMicroelectronics

부품명 AN4149
상세설명  Designing a CCM PFC pre-regulator based on the L4984D
PDF  43 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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AN4149 데이터시트(HTML) 13 Page - STMicroelectronics

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AN4149
Designing a CCM FOT-controlled PFC
The maximum value of the RMS current circulating in the boost cell at the minimum line
voltage of the selected range is equal to:
Maximum RMS input current:
Equation 28
In order to describe the energy and relevant equations concerning a boost PFC, the ratios of
the voltage inputs of the boost converter to the regulated output voltage are defined. In
particular kmin and kmax refer to the ratio of the minimum and the maximum input voltage to
the output voltage, respectively.
Equation 29
Combining equation 28 and equation 29 the maximum line peak current can be found.
Maximum line peak current:
Equation 30
Maximum inductor peak current:
Equation 31
Inductor peak-to-peak ripple current :
Equation 32
In order to calculate the losses of the switches, the RMS current flowing through the
MOSFET and through the boost output diode are found.
Maximum RMS switch current:
PF
VAC
P
I
in
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⋅
=
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A
Vac
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I
in
27
.
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99
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.
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VAC
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32
.
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Vac
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94
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=
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Vac
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