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| 型號(hào)： | AN-32 |
| 英文描述： | TOPSwitch-GX Flyback Design Methodology |
| 中文描述： | 的TOPSwitch - GX系列反激式設(shè)計(jì)方法 |
| 文件頁(yè)數(shù)： | 2/16頁(yè) |
| 文件大?。?/td> | 134K |
| 代理商： | AN-32 |
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AN-32
2
B
12/02
specific issues such as constant current, constant power outputs,
etc. are beyond the scope of this application note. However,
such requirements may be satisfied by adding additional circuitry
to the basic converter configuration. The only part of the circuit
configuration that may change from application to application
is the feedback circuitry. Depending on the power supply output
specifications, one of the four feedback circuits, shown in
Figures 3, 4, 5 and 6, will be chosen for the application.
The basic circuit configuration used in
TOPSwitch-GX
flyback
power supplies is shown in Figure 1, which also serves as the
reference circuit for component identifications used in the
description throughout this application note.
Design Flow
Figures 2A, 2B and 2C present a design flow chart showing the
complete design procedure in 37 steps. With the basic circuit
configuration shown in Figure 1 as its foundation, the logic
behind this design approach can be summarized as follows:
1. Determine system requirements and decide on feedback
circuit accordingly.
2. Choose the smallest
TOPSwitch-GX
capable of the
required output power.
3. Design the smallest transformer for the
TOPSwitch-GX
chosen.
4. Select all other components in Figure 1 to complete the
design.
Figure 2A. TOPSwitch-GX Design Flow Chart. Step 1 to 11.
1. System Requirements
V
ACMIN
, V
ACMAX
, f
L
, V
O
, P
O
,
η
, Z
2. Choose Feedback Circuit & V
B
3. Determine C
IN
, V
MIN
, V
MAX
4. Determine V
OR
, V
CLO
6. Determine D
MAX
5. Set K
P
9. Choose TOPSwitch-GX & f
S
Using AN-29
10. Set I
Reduction Factor K
Calculate I
LIMIT
(min) & I
LIMIT
(max)
N
Y
8. Calculate Primary RMS Current I
RMS
To Step 12
Step 1-2
Determine System Level Requirements
and Choose Feedback Circuit
11. I
P
≤
I
LIMIT
(min)
Step 3-11
Choose The Smallest TOPSwitch-GX
For The Required Power
PI-3039-080502
7. Calculate Primary Peak Current I
P
From Step 23
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