Application Note
8
2011-07-06
Figure 2
Voltage gain
G
Vs normalized frequency
F
Among the curves, we find that the one with
267
.
0
=
Q
can achieve the required peak gain
pk
G
, which
is 8% higher than
max
M
for design margin, i.e.
28
.
1
08
.
1
max
=
=
M
G
pk
From the curve, the corresponding
35
.
0
min
=
F
can be located where
28
.
1
=
pk
G
is achieved.
Having found the proper
Q
, we can calculate the
r
C
,
r
L
and
p
L
as follows:
nF
R
f
Q
C
eff
r
r
66
106
*
10
*
85
*
268
.
0
*
2
1
*
*
*
2
1
3
=
=
=
π
π
[8]
uH
C
f
L
r
r
r
53
10
*
66
*
)
10
*
85
*
2
(
1
*
)
*
2
(
1
9
2
3
2
=
=
=
−
π
π
[9]
uH
mL
L
r
p
690
=
=
2.2.6.1
Resonant choke design
The minimum rms voltage across the resonant network is:
[10]
Then the corresponding rms current flowing through the resonant choke
r
L
can be calculated as:
0.2
0.35
0.5
0.65
0.8
0.95
1.1
1.25
1.4
0.8
0.888
0.975
1.063
1.15
1.238
1.325
1.413
1.5
G F
0.22
,
(
)
G F
0.267
,
(
)
G F
0.3
,
(
)
G F
0.35
,
(
)
G F
0.5
,
(
)
G F
0.65
,
(
)
G F
0.8
,
(
)
Line
F
V
V
V
in
rms
in
79
.
151
2
.
337
*
2
2
min
_
min
_
_
=
=
=
π
π