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參數(shù)資料
| 型號(hào)： | AN-29 |
| 英文描述： | TOPSwitch-GX Flyback Quick Selection Curves |
| 中文描述： | 的TOPSwitch - GX系列激快速選擇曲線 |
| 文件頁(yè)數(shù)： | 2/12頁(yè) |
| 文件大?。?/td> | 91K |
| 代理商： | AN-29 |
AN-29
2
D
2/03
Table 1. Typical Power Supply Component Parameters for a TOPSwitch-GX Flyback Power Supply with a Universal Input (12 V output).
TYPICAL 12 V OUTPUT POWER SUPPLY COMPONENT PARAMETERS
PARAMETER
Maximum Transformer
Primary Inductance Lp
Transformer Leakage
Inductance
Secondary Trace
Inductance
Transformer Resonant
Frequency (secondary
open)
Transformer Primary
AC Resistance
Transformer Secondary
AC Resistance
Output Capacitor
Equivalent Series
Resistance @100 kHz
Output Inductor DC
Resistance
Common Mode Inductor
DC Resistance
(both legs)
Core Loss
Units
μ
H
242Y
2780
243Y
1385
244Y
923
245Y
693
246Y
462
247Y
346
248Y
277
249Y
231
%/Lp
1.5
1.0
1.0
1.0
1.0
1.0
1.0
1.0
nH
30
30
30
30
30
30
30
30
kHz
750
800
850
900
950
1000
1050
1100
m
2400
1200
800
700
600
500
400
300
m
30
15
10
8
6
4
2
1
m
24
18
15
12
10
8
6
4
m
32
25
20
15
13
10
7.5
5
m
370
340
310
280
250
220
190
160
%/PIN
2
2
2
2
2
2
2
2
UNIVERSAL INPUT (85-265 VAC)
230 VAC, 250 W design is possible with the TOP249 at an
output voltage of 48 V with an efficiency of 84.5%. Note that
curves for 19 V and 48 V are not provided.
Selection Curve Assumptions
The Selection Curves are based on specific design assumptions
that are detailed below:
The switching frequency is 132 kHz in all cases.
For Universal Input the input bulk capacitor is sized at
3
μ
F/W of the maximum load. For single voltage input the
input bulk capacitor is sized at 1
μ
F/W.
A V
(reflected voltage) of 135 V is assumed for all the
curves. This is the output voltage reflected by the turns ratio
to the primary side.
A Zener primary clamp used to limit the leakage inductance
spike is assumed to provide a constant clamping level of
200 V. Practical implementation may require a parallel RC
network to limit Zener dissipation.
All curves assume a Schottky output diode. The 5 V output
curves use a 45 V Schottky diode with a forward drop of
0.4 V. The 12 V output curves use a Schottky diode with a
forward voltage drop of 0.54 V.
Besides the design criteria above, typical power supply
component parameters used in generating the data for the Quick
Selection Curves are provided in Tables 1 to 4. For 5 V designs
using the TOP246 or larger the secondary trace inductance must
be reduced as the output power increases to limit clamp
dissipation. This is reflected in the table data.
The efficiency curves are valid only when using the component
values shown in Tables 1 to 4. Changes to these parameters may
give different results.
Selecting the correct TOPSwitch-GX
This section explains how to select the correct
TOPSwitch-GX
using the curves (Figures 1-4). The procedure uses the curves
to estimate efficiency of the power supply and the corresponding
dissipation in the
TOPSwitch-GX
device
.
Start with the output power of the application on the X-axis.
Move vertically to the intersection with the first
TOPSwitch-GX
curve (solid line) and then read the efficiency directly from the
Y-axis. From the same intersection point on the
TOPSwitch-GX
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