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參數(shù)資料
| 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)： | 6/24頁 |
| 文件大小： | 569K |
| 代理商： | AN-22 |
AN-22
C
5/98
6
77 T
0.3 mm
(29 AWG)
22 T
0.5 mm (24 AWG)
30 V
(a) Separate Winding
(b) Stacked Winding
PI-2743-120297
RTN
12 V
9 T
0.3 mm
(29 AWG)
4 T
0.5 mm (24 AWG)
3 in parallel
9 T
0.5 mm (24 AWG)
2 in parallel
RTN
5 V
RTN
77 T
0.3 mm
(29 AWG)
13 T
0.5 mm (24 AWG)
30 V
9 T
0.3 mm
(29 AWG)
5 T
0.5 mm (24 AWG)
2 in parallel
12 V
5 V
RTN
4 T
0.5 mm (24 AWG)
4 in parallel
N
S
= number of secondary turns (4 turns for the 5 V output)
Substitution of these values into (1) gives:
V
PT
=
1.43 V per turn
This value is used to calculate the turns required by the other
outputs.
Simple rearrangement of (1) gives:
N
V
V
V
S
O
D
PT
=
+
(
)
(2)
For the 12 V output,
V
O
=
12 V
V
D
=
0.7 V
Substituting in (2):
N
S
12
12
(
0. )
1 43
.
=
+
=
8.9 turns
A practical transformer requires integer numbers of turns;
therefore, the 12 V output uses 9 turns.
For the 30 V output,
V
O
=
30 V
V
D
=
0.7 V
Substituting in (2) gives:
N
S
30
30
0. )
1 43
.
21. turns
=
+
=
(
Select 22 turns for the 30 V winding.
This last result highlights a frequently encountered problem in
multiple output transformers. An integer number of turns, such
as 21 or 22, will make the output voltage lower or higher
respectively than desired. Since this is a high voltage output
with a large number of turns, the difference between the
desired value and the integer value amounts to only about 2%.
The resulting change in output voltage is not significant, and
will be masked by other factors such as cross regulation and
diode characteristics. However, it is worth mentioning the
options available should this problem be encountered with
Figure 3. Transformer Winding Diagrams Showing Two Techniques for the Secondary Winding.
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