參數(shù)資料
型號(hào)： 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(yè)數(shù)： 9/32頁(yè)
文件大?。?/td> 275K
代理商： AN-18
A
7/96
AN-18
9
Figure 11. Transformer Shield Placement.
SECONDARY
Insulated Wire Transformer
Margin Wound Transformer
TAPE
SHIELD
}
BIAS
TRANSFORMER SHIELD PLACEMENT
SECONDARY
MARGINS
BIAS
SHIELD
PRIMARY
PI-1814-032796
PRIMARY
PI-1648-111695
COPPER
FOIL
STRAP
Figure 12. Transformer Flux Band.
the information required to specify a transformer can be read
directly from the completed spreadsheet. Other parameters
must be calculated using numbers from the spreadsheet and
information from other sources, such as a wire table. The
spreadsheet parameters listed below provide information used
to specify a transformer. The number in parentheses indicates
the cell location in the spreadsheet.
Core Type (B23)
Bobbin Physical Winding Width (BW) (B27)
Safety Margin Width (M) (B28)
Number of Primary Layers (L) (B29)
Number of Secondary Turns (N
S
) (B30)
Primary Inductance (L
) (D44)
Primary Number of Turns (N
P
) (D45)
band” can be added around the outside of the transformer, as
shown in Figure 12. The “flux band” acts as a shorted turn for
stray flux outside the magnetic circuit formed by the transformer
windings and core. Opposing currents are induced in the flux
band by the stray fields, partially canceling their influence. If
necessary, the flux band can also be connected to primary return
to help reduce electrostatically coupled interference. If a flux
band is used, care must be taken to make sure that there is
sufficient total creepage distance from the primary pins to the
secondary pins through the flux band. Refer to AN-15 for more
information on EMI reduction techniques.
Transformer Construction
Two transformer design and construction examples are shown
in Appendix B for margin wound and triple insulated
transformers for use with
TOPSwitch
. The design procedure for
the two examples utilizes computer spreadsheet techniques
described in application notes AN-16 and AN-17. The detailed
step-by-step flyback power supply design procedure for using
the spreadsheet is shown in AN-16, while the spreadsheet itself
is described in detail in AN-17. The paragraphs below describe
the procedures needed to apply the information generated by
the power supply design spreadsheet to a practical transformer
design. These procedures are used to complete the two design
examples in Appendix B. In this application note, two completed
spreadsheet design examples are presented. Information derived
from these spreadsheets is used in the construction examples.
Spreadsheet Parameters Used for
Transformer Specification
Once a power supply design spreadsheet has been completed
and optimized, information from the spreadsheet can be used to
complete a specification for transformer construction. Much of
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