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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)： | 16/32頁 |
| 文件大?。?/td> | 275K |
| 代理商： | AN-18 |
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AN-18
A
7/96
16
Figure 1. Typical TOPSwitch Power Supply for 12V, 15W Output.
PI-1809-031896
RTN
D2
MBR360
D3
1N4148
R2
68
VR2
1N6001B
11 V
C3
120
μ
F
25 V
T1
D1
UF4005
C2
680
μ
F
25 V
VR1
P6KE200
BR1
600 V
C1
47
μ
F
400 V
R1
39
U2
NEC2501-H
U1
TOP201YAI
DRAIN
SOURCE
CONTROL
C4
0.1
μ
F
C7
1.0 nF
Y1
L1
3.3
μ
H
F1
3.15 A
J1
C6
0.1
μ
F
X2
L2
22 mH
L
N
1
9,10
2
6,7
5
4
C5
47
μ
F
10 V
VIN = 85-265 VAC
50/60 Hz
VB = 12 V
IB = 10 mA
VO = 12 V
PO = 15 W
Appendix B
Transformer Construction Examples
Two transformer design and construction examples using margin
wound and triple insulated wire construction techniques are
described below. These designs are based on the 12V, 15W
universal input power supply shown in Figure 1. 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. Two completed
spreadsheet design examples are shown in this appendix
(Table 1 and Table 6). Information derived from these
spreadsheets is used in the construction examples.
Spreadsheet Input Parameters
Two power supply design spreadsheets are shown in Tables 1
and 6. Table 1 details a power supply design utilizing a margin
wound transformer with an EF25 core. Table 6 shows a design
for the same power supply utilizing a triple insulated wire
transformer with an EF20 core. The power supply design shown
in Figure 1 was used as a starting point for both transformer
design/construction examples. Target specifications for this
power supply design are shown in Table 2. Specifications and
selected component values from Table 2 are loaded into the
application variables section of the spreadsheets. Table 3 shows
TOPSwitch
and output rectifier operating conditions used in the
TOPSwitch
variable section of the spreadsheets. Since both of
the transformer designs are for the same power supply, the
values loaded into the application variables section and
TOPSwitch
variable section for both spreadsheets are exactly
the same, with the exception of the value used for reflected
output voltage (V
, cell B16). For the triple insulated wire
transformer design shown in Table 6, V
is adjusted to a value
slightly lower than the default value recommended in AN-16 in
order to reduce the number of primary turns. This is discussed
in the paragraphs devoted to the triple insulated wire design
example.
The transformer construction variables in the design spreadsheet
are determined by the core, bobbin and transformer construction
type, and are therefore different for the two design examples.
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