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AN3112 датащи(PDF) 14 Page - STMicroelectronics

номер детали AN3112
подробное описание детали  Solution for designing a fixed off-time controlled PFC pre-regulator
PDF  36 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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Designing a fixed-off-time PFC
AN3112
14/36
Doc ID 16820 Rev 3
Equation 23
Vout is usually selected in the range of 1.5% of the output voltage. Although ESR does not
usually affect the output ripple, it should be taken into account for power loss calculations.
The total RMS capacitor ripple current, including mains frequency and switching frequency
components, is:
Equation 24
If the PFC stage must guarantee a specified hold-up time, the selection criterion of the
capacitance is different. Co has to deliver the output power for a certain time (tHold) with a
specified maximum dropout voltage (Vout min) that is the minimum output voltage value
(which takes load regulation and output ripple into account). Vout min is the minimum output
operating voltage before the 'power fail' detection and consequent stopping by the
downstream system supplied by the PFC.
Equation 25
A 20% tolerance on the electrolytic capacitors must be taken into account for correct
dimensioning.
Following the previous relationships, after selecting the commercial value of 330 µF the
actual hold-up capability and ripple voltage are recalculated.
In detail:
Equation 26
Equation 27
4.3.4
Boost inductor
In the continuous mode approach, the acceptable current ripple factor, Kr, is typically fixed in
the range between 10% to 35%. For this design, the maximum specified current ripple factor
is 34%.
out
out
l
out
out
l
out
O
V
V
f
2
P
V
f
2
I
C
∆
⋅
⋅
⋅
π
=
∆
⋅
⋅
π
≥
F
338
V
10
V
400
Hz
47
2
W
400
C
O
µ
=
⋅
⋅
⋅
π
≥
2
out
rms
2
Crms
I
ID
I
−
=
() (
)
A
36
.
2
A
0
.
1
A
56
.
2
I
2
2
Crms
=
−
=
() 2
min
out
2
out
out
Hold
out
O
V
V
V
t
P
2
C
−
∆
−
⋅
⋅
=
() (
)
F
3
.
242
V
300
V
10
V
400
ms
20
W
400
2
C
2
2
O
µ
=
−
−
⋅
⋅
=
()
out
2
min
out
2
out
out
O
hold
P
2
V
V
V
C
t
⋅
⎥⎦
⎤
⎢⎣
⎡
−
∆
−
⋅
=
() (
)
[
]
ms
22
W
400
2
V
300
V
10
V
400
F
330
t
2
2
hold
=
⋅
−
−
⋅
µ
=
O
l
out
out
C
f
2
I
V
⋅
⋅
π
⋅
=
∆
V
2
.
10
F
330
Hz
47
2
A
0
.
1
Vout
=
µ
⋅
⋅
π
⋅
=
∆



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