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AN3095 Datasheet(PDF) 18 Page - STMicroelectronics

No. de pieza AN3095
Descripción Electrónicos  The STEVAL-ISV002V2 demonstration board is the same
PDF  55 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3095 Datasheet(HTML) 18 Page - STMicroelectronics

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DC-DC converter design
AN3095
18/55
Doc ID 16555 Rev 3
The transformer apparent power is:
Equation 22
Then the electrical condition parameter calculation Ke may be evaluated:
Equation 23
where Kf=4.44 is the waveform coefficient.
Equation 24
Now, the core geometry parameter is calculated as:
Equation 25
The Kg parameter of a generic transformer core is given by the following equation:
Equation 26
Using two sets of E70/33/32s the following condition is verified:
Equation 27
The number of primary turns for the design flux swing is:
Equation 28
The primary inductance value is:
Equation 29
and the number of secondary turns is:
Equation 30
W
6061
I
V
)
1
1
(
P
P
P
0
0
0
0
t
=
+
η
=
+
η
=
( )4
2
m
2
2
f
e
10
B
f
K
145
.
0
K
-
•
•
•
=
( ) 7606
10
)
15
.
0
(
)
000
.
35
(
)
44
.
4
(
145
.
0
K
4
2
2
2
e
=
=
-
5
e
t
g
cm
65
.
2
K
2
P
K
=
α
=
MLT
K
A
W
K
u
2
c
a
gCORE =
MLT
K
A
W
K
u
2
c
a
gCORE =
>Kg
turns
14
A
2
B
T
D
V
N
c
max
in
1
min
=
⋅
⋅
Δ
=
()
mH
48
.
2
nH
12666
*
14
A
N
L
2
L
2
p
=
=
=
turns
17
1
N
n
N
2
=
•
=



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