參數(shù)資料
型號： AN-32
英文描述： TOPSwitch-GX Flyback Design Methodology
中文描述： 的TOPSwitch - GX系列反激式設(shè)計方法
文件頁數(shù)： 12/16頁
文件大?。?/td> 134K
代理商： AN-32
AN-32
12
B
12/02
Gap length in mm: L
g
≥
0.1
where L
g
in mm, A
e
in cm
2
, A
L
in nH/turn
2
and
L
P
in
μ
H
Primary winding current capacity in circular mils per amp:
500
≥
CMA
≥
200
where DIA is the bare conductor diameter in mm
Iterate by changing L, N
S
, core/bobbin according to Table 7.
B
M
L
g
CMA
L
↑
-
-
↑
N
S
core
size
↑
↑
↑
↑
↑
Table 7.
Step 23. Check B
P
≤
4200 . If necessary, reduce current
limit by lowering I
LIMIT
reduction factor K
I
Check B
≤
4200 gauss (0.42 tesla) to avoid transformer
saturation at startup and output over load.
Decrease K
I
, if necessary, until B
P
≤
4200.
Step 24. Calculate secondary peak current I
SP
N
N
S
Step 25. Calculate secondary RMS current I
SRMS
Continuous mode
Discontinuous mode
Step 26. Determine secondary winding wire parameters
OD
S
, DIA
S
, AWG
S
Secondary wire outside diameter in mm
Secondary wire bare conductor diameter in mm
where CMA
is secondary winding current capacity
in circular mils per amp. Minimum wire diameter is
calculated by using a CMA
S
of 200.
Determine secondary winding wire gauge AWG
based on
DIA
. If the bare conductor diameter of the wire is larger
than that of the 27 AWG for 132 kHz or 25 AWG for
66 kHz, a parallel winding using multiple strands of thinner
wire should be used to minimize skin effect.
Step 27. Determine output capacitor ripple current I
RIPPLE
Output capacitor ripple current
where I
O
is the output DC current
Step 28. Determine maximum peak inverse voltages PIV
S
,
PIV
B
for secondary and bias windings
Secondary winding maximum peak inverse voltage.
Bias winding maximum peak inverse voltage.
Step 29. Select clamp Zener and blocking diode per Table 8
for primary clamping based on V
OR
and the type of output
Table 8.
↑
↑
↑
Blocking
Diode
BYV26C
MUR160
UF4005
BYV26C
MUR160
UF4005
Clamp
Zener
P6KE150
P6KE180
PS Output
V
OR
Multiple Output 100 V
Single Output 120 V
L
A
N
L
A
g
e
P
×
P
L
=
×
×
×
40
1000
1
2
π
CMA
DIA
I
RMS
=
×
×
×
1 27
.
4
1000
25 4
2
2
.
π
B
I
I
B
P
LIMIT
P
M
=
×
(max)
I
I
SP
P
P
=
×
I
I
D
K
3
K
SRMS
SP
MAX
P
P
=
×
(
)
×
+
1
1
2
I
I
D
×
K
SRMS
SP
MAX
P
=
×
3
1
OD
BW
M
N
S
S
=
×
(
)
2
DIA
CMA
1 27
.
I
S
S
×
SRMS
=
×
×
×
4
25 4
1000
.
π
I
I
I
RIPPLE
SRMS
O
=
2
2
PIV
V
V
N
N
S
O
MAX
S
P
=
+
×
(
)
PIV
V
V
N
N
B
B
MAX
B
P
=
+
×
(
)
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