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AN3095 Datasheet(PDF) 19 Page - STMicroelectronics

Part # AN3095
Description  The STEVAL-ISV002V2 demonstration board is the same
PDF  55 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3095 Datasheet(HTML) 19 Page - STMicroelectronics

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AN3095
DC-DC converter design
Doc ID 16555 Rev 3
19/55
The next step is to choose the wire size in order to realize primary and secondary windings.
At 35 kHz, current penetration depth is:
Equation 31
Then, the wire diameter may be selected as follows:
Equation 32
And the conductor section is:
Equation 33
AWG21, having d=0.072 cm and a wire area of AWAWG22=0.0040 cm
2, may be used for this
design. Considering a current density of J=500 A/cm2, the number of primary wires is given
by:
Equation 34
where
Equation 35
Since the AWG21 has a resistance of 420 µ
Ω/cm, the primary resistance is:
Equation 36
and so the value of resistance for the primary winding is:
Equation 37
With the same procedure for the secondary winding it is:
Equation 38
cm
035
.
0
f
62
.
6
=
=
δ
cm
07
.
0
2
d
=
δ
=
2
2
W
cm
0038
.
0
4
d
A
=
π
=
choose
5
.
13
A
A
S
26
AWG
w
wp
np
→
=
=
14
S
np =
2
CCM
rms
wp
cm
054
.
0
J
I
A
=
=
cm
/
30
14
cm
/
420
r
p
Ω
μ
=
Ω
μ
=
Ω
=
⋅
⋅
⋅
=
m
7
.
13
r
MLT
2
N
R
p
1
p
2
CCM
_
rms
ws
cm
045
.
0
J
n
I
A
=
⋅
=
11
A
A
S
21
wawg
ws
ns
=
=
cm
/
38
11
cm
/
420
r
s
Ω
μ
=
Ω
μ
=
Ω
=
⋅
⋅
⋅
=
m
1
.
21
r
MLT
2
N
R
s
2
s



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