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| 型號： | AN-22 |
| 英文描述： | OBSOLETE when inventory is depleted. 10% tolerance no l |
| 中文描述： | 設計多路輸出電源的的TOPSwitch |
| 文件頁數(shù)： | 18/24頁 |
| 文件大?。?/td> | 569K |
| 代理商： | AN-22 |
AN-22
C
5/98
18
Appendix A
Key Spreadsheet Variables.
The following key variables in the transformer design
spreadsheet of Figure 2 should be checked before a transformer
design can be deemed acceptable:
D
MAX
—
Must be less than the
TOPSwitch
data sheet
minimum value of 64% (0.64).
I
P
—
To allow for thermal effects, this should be no
greater than 90% of the data sheet minimum
current limit specification for the chosen
TOPSwitch
at 25
°
C. In this example, the
minimum current limit for the TOP223Y is
specified as 0.9 A, so the spreadsheet value of
0.78 meets the above criterion.
B
P
—
This must be below the recommended value of
4200 gauss to avoid excessive core saturation at
the peak
TOPSwitch
current limit. Here the value
of 3767 gauss is well within this requirement.
L
G
—
Although the guidance of transformer vendors
should be sought, airgaps of <0.051mm are not
recommended because such small gaps make
it difficult to hold a reasonable tolerance on the
specified primary inductance.
CMA
—
Values between 200 and 500 allow reasonable
temperature rise in the windings. Smaller
values indicate higher temperatures from
greater losses in the copper. The value of 219
circular mils per amp in Figure 2 meets the
recommended lower limit of 200.
Again, AN-17 should be consulted for full details on the use of
the spreadsheet of Figure 2.
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