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參數(shù)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(shù)： | 12/32頁 |
| 文件大?。?/td> | 275K |
| 代理商： | AN-18 |
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AN-18
A
7/96
12
largest wire size, is sufficient for a transformer design. This size
of sleeving can then be used for all other wire sizes in the
transformer. Sleeving is not required for triple insulated wire
designs.
Transformer Gapping , Primary Inductance Tolerance
In standard practice, transformer cores for flyback transformer
applications are gapped to a specified value of A
rather than
a precise gap length. The center value of A
can be read from
cell (C47) of the spreadsheet. A
is customarily specified to a
tolerance of +/- 5-6%. The gap length shown in cell (D 51) of
the spreadsheet is useful mainly for checking transformer peak
flux density and for determining the practicality of the design,
and should not be used in a transformer specification.
Transformer gaps smaller than 0.051 mm (0.002 in) should be
avoided, as it is difficult to maintain tolerance on this small a
gap. Transformer primary inductance tolerance should be
specified at +/- 10% to +/- 15%. Tighter tolerances offer no
performance advantages, and can be unnecessarily costly.
For high volume transformer applications, the transformer core
is commonly gapped by grinding down the center leg of one of
the ferrite core halves to introduce a single air gap in the
magnetic path of the core. An alternate technique for small
production runs and prototypes is to use non-conducting spacers
between the core halves. If spacers are chosen rather than
grinding the core center leg, the spacer thickness should be half
the value used for the center leg gap, as the magnetic path is
divided twice by the spacers: once at the core center leg, and
once at the core outer legs.
Completion of Transformer Specification
Once the above information has been determined, there is
sufficient information to complete a specification for
construction of the transformer. The specification should contain
the following information:
Transformer schematic, showing all windings, order of
windings, pin assignments, dots indicating winding starts,
turns of each winding, and wire types and sizes
Transformer parts list, including:
Core part number and A
LG
Bobbin part number
All wire types and sizes used
All insulating tape types and widths
Insulating sleeving type and size (if used)
Varnish type (if used)
Transformer specifications:
Primary inductance and tolerance
Primary leakage inductance and tolerance (determined
from prototype)
Applicable safety standards, or hipot test voltage and
minimum creepage distances
Detailed construction drawing and instructions (optional)
Design Summary
1) Load Design Spreadsheet with Application Variables and
TOPSwitch
Variables per instructions in AN-16.
2) Choose a core from Appendix A, and determine core and
bobbin parameters needed for spreadsheet from
manufacturer’s catalog data. Load these values into
the spreadsheet.
3) Complete spreadsheet per AN-16 procedure and iterate
until all parameters meet recommended design limits.
4) From spreadsheet values and Appendix A wire table,
calculate primary, secondary, and bias wire sizes.
5) Pick a transformer construction style depending on supply
regulation scheme (primary or secondary) and insulation
type (margin wound or triple insulated).
6) Calculate tape widths needed for transformer insulation.
7) Pick insulation sleeving size (if necessary).
8) Complete transformer specification using
spreadsheet
values and information from steps 4-7.
相關(guān)PDF資料 |
PDF描述 |
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| AN-19 | TOPSwitch Flyback Power Supply Efficiency |
| AN-20 | Transient Suppression Techniques for TOPSwitch Power Supplies |
| AN-22 | OBSOLETE when inventory is depleted. 10% tolerance no l |
| AN-23 | TinySwitch Flyback Design Methodology |
| AN-29 | TOPSwitch-GX Flyback Quick Selection Curves |
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參數(shù)描述 |
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