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參數(shù)資料
| 型號： | AN-16 |
| 英文描述： | TOPSwitch Flyback Design Methodology |
| 中文描述： | TOPSwitch的反激式設計方法 |
| 文件頁數(shù)： | 5/32頁 |
| 文件大小： | 247K |
| 代理商： | AN-16 |
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A
6/96
AN-16
5
Step by Step Design Procedure
This design procedure uses the AN-17 spreadsheet (available from Power Integrations), which contains all the important equations
required for a
TOPSwitch
flyback power supply design, and automates most calculations. Designers therefore are relieved from the
tedious calculations involved in the complicated and highly iterative design process. Anytime a parameter is involved in a calculation,
whether it is an input or an output, a cell location for the parameter will be shown in parenthesis at the right side of the page. For
example (A1) denotes column A and row 1. Note that all user provided inputs are in column B and all spreadsheet calculated results
are in column D. Column C is reserved for intermediate variables needed in some complicated calculations. Look up tables and rules
of thumb are also provided wherever appropriate, to facilitate the design task. For questions regarding any particular step of this
procedure, please refer to the corresponding step in the information section, where in-depth explanation is provided.
Step 1.
Determine system requirements: V
ACMAX
, V
ACMIN
, f
L
, f
S
, V
O
, P
O
,
η
, Z
Set minimum AC input voltage, V
ACMIN
, per Table 1
Set maximum AC input voltage, V
ACMAX
, per Table 1
(B3)
(B4)
Line frequency, f
: 50Hz or 60Hz
TOPSwitch
switching frequency, f
S
: 100KHz
Output voltage, V
: in Volts
Output power, P
: in Watts
Power supply efficiency,
η
: 0.8 if no better reference data available
Loss allocation factor, Z: 0.5 if no better reference data available
(B5)
(B6)
(B7)
(B8)
(B9)
(B10)
Step 2.
Choose feedback circuit and bias voltage V
B
based on output requirements:
Select a feedback circuit (Figures 3-6) based on output specification:
Choose required bias voltage, V
B
, per Table 2
(B11)
Input (VAC)
100/115
Universal
230
Table 1
V
ACMIN
(VAC)
85
85
195
V
ACMAX
(VAC)
132
265
265
Feedback
Circuit
Output Load
Line
Regulation
Reference
Design
V
B
(V)
Accuracy Regulation
Primary/basic
Primary/enhanced27.7
Opto/Zener
Opto/TL431
5.7
±
10%
±
5%
±
5%
±
1%
±
5%
±
2.5%
±
1%
±
0.2%
±
1.5%
±
1.5%
±
0.5%
±
0.2%
RD1
RD1
ST202A
ST204A
12
12
Table 2
相關PDF資料 |
PDF描述 |
|---|---|
| AN-17 | Flyback Transformer Design for TOPSwitch Power Supplies |
| AN-18 | TOPSwitch Flyback Transformer Construction Guide |
| 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 |
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