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AN2982 数据表(PDF) 9 Page - STMicroelectronics

部件名 AN2982
功能描述  This application note describes the STEVAL-ILB005V2 demonstration board equipped with the L6585DE lighting controller
PDF  31 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

AN2982 数据表(HTML) 9 Page - STMicroelectronics

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AN2982
Designing the application
Doc ID 15599 Rev 1
9/31
Figure 4.
Summary of PFC MOSFET power losses
1.2.4
Boost diode selection
Both the boost diode maximum RMS current and the RMS current are equal to:
Equation 18
Their average current is equal to:
Equation 19
The STTH1L06 Shottky diode is selected, having Vrrm = 600 V and an average forward
current If(AV) = 1 A. Total power dissipation is equal to:
Equation 20
1.2.5
Bulk capacitor selection
The ripple superimposed on the output voltage is equal to ±20 V:
Equation 21
mA
222
V
V
P
2
2
3
4
I
rms
,
in
OUT
in
rms
,
d
=
π
=
P
out
V
out
-----------
142mA
=
mW
5
.
134
222
.
0
165
.
0
142
.
0
89
.
0
P
2
D
=
⋅
+
⋅
=
mA
373
ESR
C
10
0463
.
2
I
ESR
C
V
f
4
P
V
20
V
out
4
RMS
,
C
f
@
out
out
mains
out
out
out
min
,
PFC
⋅
+
×
=
=
⋅
+
⋅
⋅
⋅
π
=
=
Δ
−



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