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AN2782 датащи(PDF) 12 Page - STMicroelectronics

номер детали AN2782
подробное описание детали  Solution for designing a 400 W fixed-off-time controlled
PDF  39 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2782 датащи(HTML) 12 Page - STMicroelectronics

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Designing a fixed off-time PFC
AN2782
12/39
Doc ID 14763 Rev 2
It is also possible to calculate the RMS current flowing into the switch and into the diode,
needed to calculate the losses of these two elements.
It is worth reminding that the accuracy of the approximate energetic relationships described
here is quite good at maximum load for low values of the parameter k, that is, at low line
voltage, but worsens at high line and as the power throughput is reduced. Since in the
design phase current stress is calculated at maximum load and minimum line voltage, their
accuracy is acceptable for design purposes.
4.3
Power section design
4.3.1
Bridge rectifier
The input rectifier bridge can use standard slow recovery, low-cost devices.Typically a
600 V device is selected in order to have good margin against mains surges. An NTC
resistor limiting the current at turn-on is required to avoid overstress to the diode bridge.
The rectifier bridge power dissipation can be calculated using equations (31), (32), (33). The
threshold voltage and dynamic resistance of a single diode of the bridge can be found in the
component datasheet.
The power dissipated on the bridge is:
●
Inductor peak
current:
(28)
●
RMS
switch
current:
(29)
●
RMS
diode
current:
(30)
max
PK
r
max
pk
I
k
3
8
8
IL
⋅
⋅
−
=
A
07
.
8
A
98
.
6
34
.
0
3
8
8
IL
max
pk
=
⋅
⋅
−
=
π
⋅
−
⋅
⋅
=
3
k
16
2
V
k
P
ISW
min
out
min
in
rms
A
22
.
4
3
318
.
0
16
2
V
400
318
.
0
W
400
ISW
rms
=
π
⋅
−
⋅
⋅
=
π
⋅
⋅
=
3
k
16
V
k
P
ID
min
out
min
in
rms
A
57
.
2
3
318
.
0
16
V
400
318
.
0
W
400
IDrms
=
π
⋅
⋅
⋅
=
(31)
(32)
A
53
.
3
2
A
99
.
4
2
2
I
2
I
in
inrms
=
⋅
=
⋅
=
A
25
.
2
A
99
.
4
2
I
2
I
in
avg
_
in
=
π
⋅
=
π
⋅
=



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