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AN2870 Datasheet(PDF) 24 Page - STMicroelectronics

Part # AN2870
Description  L6585DE combo IC
PDF  41 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2870 Datasheet(HTML) 24 Page - STMicroelectronics

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Designing with L6585DE
AN2870
24/41
The time when input voltage is greater than VOUT/2 can be calculated as follows:
Equation 15
Within t2-t1 interval capacitive losses can be written as:
Equation 16
Where
Equation 17
These losses are greater at higher input voltage.
Figure 13
illustrates an example of calculation in wide range application
(Pin = 64 W, MOSFET STx7NM50).
Figure 13.
PFC MOSFET losses (example)
1
mains
2
mains
rms
,
in
OUT
1
t
f
2
1
t
f
2
V
2
2
V
arcsin
t
−
=
π
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
⋅
⋅
=
()
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
+
+
+
=
2
Drain
ext
oss
rss
2
3
Drain
oss
sw
cap
V
C
C
C
2
1
V
C
3
.
3
f
P
()
[
]
∫
−
ω
⋅
=
2
1
t
t
2
out
rms
,
in
mains
rms
,
Drain
dt
V
t
sin
V
2
2
f
2
V



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