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參數(shù)資料
| 型號(hào)： | AN-21 |
| 英文描述： | TOPSwitch-II Flyback Quick Selection Curves |
| 中文描述： | 的TOPSwitch -Ⅱ激快速選擇曲線 |
| 文件頁(yè)數(shù)： | 4/8頁(yè) |
| 文件大小： | 400K |
| 代理商： | AN-21 |
AN-21
B
5/98
4
UNITS TOP221 TOP222 TOP223 TOP224 TOP225 TOP226 TOP227
Table 3. Typical Power Supply Component Parameters for TOPSwitch-II Flyback Power Supply.
TYPICAL POWER SUPPLY COMPONENT PARAMETERS
Transformer Primary Inductance
Transformer Leakage Inductance
(referred to the primary)
Transformer Resonant Frequency
(measured with secondary open)
Transformer Primary
Winding Resistance
Transformer Secondary Resistance
Output Capacitor Equivalent
Series Resistance
Output Inductor DC Resistance
Common Mode Inductor
DC Resistance
μ
H
μ
H
kHz
m
m
m
m
m
8650
175
400
5000
20
30
40
400
4400
90
450
1800
12
24
32
370
2200
45
500
650
7
18
25
333
1475
30
550
350
5
15
20
300
1100
22
600
250
4
13
16
267
880
18
650
175
3.5
11.5
13
233
740
15
700
140
3
10
10
200
PARAMETER
This effective output power is then used with the curves in
Figure 2 to select the
TOPSwitch-II
device and to estimate the
TOPSwitch-II
dissipation. Predictions of efficiency and power
dissipation may be less accurate when the ratio is used. The
new value of primary inductance is the product of the power
ratio and original inductance value in Table 3. The new
inductance value for the TOP224 would be:
L
P
=
×
=
1475
1 15
.
1696
H
H
Selection Curve Assumptions
Several physical power supply parameters must be calculated,
estimated, or measured to determine efficiency. Measured
values can differ significantly from the curves
’
predictions if
the design parameters are not the same as the typical values
used to generate the curves.
Typical values are given in Table 1 for several parameters that
are independent of power level and input voltage. These
parameters are defined and discussed in AN-16 and AN-17.
Typical values are given in Table 2 for two parameters that
depend only on input voltage. These parameters change with
TOPSwitch-II
duty cycle.
The remaining power supply parameters depend on the output
power. Table 3 gives typical values for the power-dependent
parameters
Input Capacitance
Efficiency and output power are both strong functions of bulk
energy storage capacitor C1. For the Universal AC Mains
curves, the numerical value of C1 in microfarads is assumed to
be at least three times the maximum output power in watts. For
230 VAC mains, the C1 value (
μ
F) is assumed to be at least
equal to the maximum output power (watts).
For example, for 30 W of output power, the bulk energy storage
capacitor C1 is expected to be at least 90
μ
F for Universal
mains and 30
μ
F for 230 VAC mains applications. The design
must consider the tolerance of the capacitor to guarantee
expected performance from the power supply.
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