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參數資料
| 型號： | AN-18 |
| 英文描述： | TOPSwitch Flyback Transformer Construction Guide |
| 中文描述： | 回掃變壓器的TOPSwitch施工指南 |
| 文件頁數： | 22/32頁 |
| 文件大?。?/td> | 275K |
| 代理商： | AN-18 |
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AN-18
A
7/96
22
Tape Sizes
For a margin wound design, three sizes of tape are required for
reinforced insulation, basic insulation, and margins. The tape
width required for the reinforced insulation layers on this
transformer is equal to BW. From cell (B27) of the Table 1
spreadsheet, this is 15.1 mm. The width W
TB
of the basic
insulation tape is calculated as:
W
BW
M
mm
TB
=
×
=
×
=
(
)
.
(
)
.
2
15 1
2
3
9 1
The margin tape width (M) is read from cell (B28) of the
spreadsheet, and is set at 3 mm to meet international safety
Insulating Sleeving Size
The insulating sleeving size required for this transformer deign
is equivalent to the largest wire size in the transformer, or
24 AWG. The sleeving should have a wall thickness of at least
0.4 mm to meet international safety regulations.
Gapped Core Inductance Coefficient
The A
for this transformer design is given in cell (C47) of the
design spreadsheet, and should be used as the center value for
specifying the core A
LG
on the transformer specification.
Finished Margin Wound Transformer Design
The information required to assemble a transformer specification
for the margin wound transformer example is summarized in
Table 5. A completed transformer schematic diagram and parts
list are shown in Figure 4. A construction drawing is shown in
Figure 5.
Bias Wire Size
The bias winding wire size is chosen to fill as much of the
bobbin width as possible. Since there are usually relatively few
primary bias winding turns, this is best accomplished by using
a bifilar winding rather than a large diameter wire, effectively
doubling the number of physical turns.
The required TC can be
calculated as follows:
TC
N
BW
13 2
M
turns cm
B
2
(
=
×
×
×
=
× ×
×
=
2
10
2
2
(
15 1
3
)
.
)
.
From the wire table in Appendix A, the closest wire size with
TC greater than or equal to 13.2 turns/cm is 22 AWG, with a TC
of 14.25 turns/cm. This is too large a wire size to use with an
EF25 core and bobbin. As a compromise, 24 AWG wire is used
instead. This wire size will not completely cover the available
bobbin width, but is an acceptable compromise for the sake of
manufacturability. Since the output current of this winding is
10 mA or less, there is no need to consider the current capacity
of the wire or high frequency skin effect. The wire size in this
case is determined by space-filling requirements rather than
current capacity.
Transformer Construction Style
Since this transformer is a margin wound design for a secondary
regulated application, appropriate construction styles are
Figures 7A and 10A. Because this design is for a 15W
application, the split primary winding shown in Figure 10A is
not necessary, and more cost effective single section primary
design of Figure 7A should be used.
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