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AN4149 数据表(PDF) 23 Page - STMicroelectronics

部件名 AN4149
功能描述  Designing a CCM PFC pre-regulator based on the L4984D
PDF  43 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

AN4149 数据表(HTML) 23 Page - STMicroelectronics

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DocID023523 Rev 2
23/43
AN4149
Designing a CCM FOT-controlled PFC
If a single heatsink for the MOSFETs and diode is used, the maximum total losses of the
switches should be considered:
Equation 67
From this number and the given maximum ambient temperature, the total maximum thermal
resistance required can be found as:
Equation 68
In this design in order to keep the junction MOSFET temperature below 100 °C (around
90 °C measured on the package) and to ensure a higher degree of reliability, the thermal
resistance has been chosen equal to:
Equation 69
W
W
W
W
P
V
P
V
P
P
rr
diode
loss
switch
56
.
9
24
.
2
48
.
1
84
.
5
)
90
(
)
90
(
=
+
+
=
+
+
=
switch
ambx
th
P
T
C
R
−
°
=
125
W
C
W
C
C
R
th
°
=
°
−
°
=
85
.
7
56
.
9
50
125
W
C
W
C
C
R
th
°
=
°
−
°
=
23
.
5
57
.
9
50
100



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