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參數(shù)資料
| 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 |
| 文件頁數(shù)： | 5/16頁 |
| 文件大小： | 134K |
| 代理商： | AN-32 |
AN-32
5
B
12/02
Power supply efficiency,
η
: 0.8 if no better reference data
available. (Refer to AN-29)
Loss allocation factor, Z: If Z = 1, all losses are on the
secondary side. If Z = 0, all losses are on the primary side.
Set Z = 0.5 if no better reference data is available.
Step 2. Choose feedback circuit and bias voltage V
B
based
on output requirements
Feedback
Circuit
V
(V) Tolerance
Circuit
Load*
Reg.
Line
Reg.
Total
Reg.
Pri./Basic
5.8
±
10%
±
5%
±
1.5%
±
16.5%
Pri./Enhan. 27.8
±
5%
±
2.5%
±
1.5%
±
9%
Opto/Zener 12
±
5%
±
1%
±
0.5%
±
6.5%
Opto/TL431 12
±
1%
±
0.2%
±
0.2%
±
1.4%
*Over 10% to 100% Load Range.
Table 2.
Use primary feedback for lowest cost (for low power
applications only).
Use Opto/Zener for low cost, good output accuracy.
Use Opto/TL431 for best output accuracy.
Set bias voltage V
according to Table 2.
Choose optocoupler from Table 3.
Step-by-Step Design Procedure
This design procedure uses the
PI Expert
design software (available
from Power Integrations), which contains all the important
equations required for a
TOPSwitch-GX
flyback power supply
design, and automates most calculations. Designers are, therefore,
relieved from the tedious calculations involved in the complicated
and highly iterative design process. Look-up tables and empirical
design guidelines are provided in this procedure where appropriate
to facilitate the design task.
Step 1. Determine system requirements: V
ACMAX
, V
ACMIN
,
f
L
, V
O
, P
O
,
η
, Z
Minimum AC input voltage, V
ACMIN
: in volts.
Maximum AC input voltage, V
ACMAX
: in volts.
Recommended AC input ranges:
Input (VAC)
V
ACMIN
(VAC) V
ACMAX
(VAC)
Universal
85
265
230 or 115 with doubler
195
265
Table 1.
Line frequency, f
L
: 50 Hz or 60 Hz.
Output voltage, V
: in Volts.
Output power: P
O
: in Watts.
Figure 3. Primary/Basic Feedback Circuit.
PI-3331-112202
D
S
C
TOPSwitch-GX
L
CONTROL
+
-
F
X
V
AC
C
IN
V
O
15
Feedback Circuit
+
CIRCUIT PERFORMANCE
Circuit Tolerance
±
10%
Load Regulation
±
5%
Line Regulation
±
1.5%
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