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Giải thích chi tiết về linh kiện  Designing a CCM PFC pre-regulator based on the L4984D
PDF  43 Pages
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AN4149 bảng dữ liệu(HTML) 21 Page - STMicroelectronics

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AN4149
Designing a CCM FOT-controlled PFC
The MOSFET total losses at minimum input voltage (VACmin) is the sum of the three
previous losses from equation 54, equation 55, and equation 60:
Equation 61
From equation 61, using the data relevant to the MOSFET selected, it can be observed that
the maximum total losses, occurring at VACmin and full load, is around 5 W. From this
number and the given maximum ambient temperature, the total maximum thermal
resistance required to keep the MOSFET's junction temperature below 125 °C is:
Equation 62
As the result of equation 62 is much lower than the junction-ambient thermal resistance
given in the MOSFET datasheet for the selected device package (62.5 °C/W), a heatsink
must be used.
Figure 12 shows the trend of the total losses on the line voltage for the two selected
STF21N65M5 MOSFETs.
Figure 12. Total MOSFETs losses in the 350 W FOT PFC
(
)
()
()
W
W
W
W
V
P
VAC
P
VAC
P
VAC
P
VAC
P
loss
cap
sw
cond
loss
23
.
5
1
2
.
2
02
.
2
)
90
(
)
(
=
+
+
=
+
+
=
)
(
125
VAC
P
T
C
R
loss
ambx
th
−
°
=
W
C
W
C
C
R
th
°
=
°
−
°
=
3
.
14
23
.
5
50
125
AM13311v1
80
100
120
140
160
180
200
220
240
260
0
1
2
3
4
5
6
Conduction losses
Switching losses
Capacitive losses
Total losses
Power losses vs Input voltage (full load)
Input voltage (Vac)



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