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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 3/12頁 |
| 文件大?。?/td> | 91K |
| 代理商： | AN-29 |
AN-29
3
D
2/03
curve, interpolate the
TOPSwitch-GX
power dissipation from
the constant power dissipation contours (dashed lines).
Some output power levels can be delivered by more than one
TOPSwitch-GX
device. When moving vertically from the
X-axis, the first curve encountered will be the smallest, lowest
cost
TOPSwitch-GX
device, while the last curve encountered
will be the largest, most efficient
TOPSwitch-GX
device suitable
for the desired output power.
Thermal requirements and packaging of the proposed power
supply may call out for a more efficient device rather than the
smallest or lowest-cost possibility. In addition the P and G
packages (8 pin DIP) have a practical dissipation limit of around
0.85 W in a 50
°
C ambient, giving a device junction temperature
of ~100
°
C. This ensures that there is adequate margin to
thermal shutdown including device variation. Typical
temperatures above 110
°
C are not recommended. The TO-220
package does not have this limit due to the ability to mount the
tab to a suitably sized heatsink.
Example 1: 30 W Universal Application
Consider a 5 V / 30 W power supply with universal input range.
From the curves in Figure 2, we can see that the TOP244 can
deliver 30 W (X-axis) with an estimated efficiency (Y-axis) of
about 67.5%. The projected
TOPSwitch-GX
dissipation is
approximately 3.5 W.
Alternatively continuing the TOP245 could be used with an
efficiency of 70.5% and a device disspation of approximately
2.5 W. As the dissipation is above 0.85 W, Y packaged devices
should be used.
The thermal environment and the available heatsinking must
still be evaluated to confirm the choice of device in this
application.
Example 2: 12 W Adapter Application
Consider a 12 W, 12 V supply with universal input range. From
the curves in Figure 1 we see that a TOP243 or TOP244 could
be used, TOP243 with an efficiency of 82% and a device
dissipation of 0.7 W or a TOP244 with an efficiency of 83% and
a device dissipation of 0.5 W. The TOP242 is ruled out as we
require to use the P package and therefore are limited to a
dissipation of less than 0.85 W
This is an adapter design in an enclosed plastic box, so the
maximum power available from the supply is limited by thermal
considerations. The worst-case external ambient (T
A_EXT
) is
TYPICAL 5 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
1.5
1.5
1.5
1.5
1.5
1.5
1.5
nH
20
20
20
20
19
16
13
10
kHz
750
800
850
900
950
1000
1050
1100
m
2000
1060
700
600
500
300
200
100
m
12
6
4
3
2
1
0.75
0.5
m
18
9
6
5
4
3
2
1
m
6
4.5
3.5
3
2.5
2
1.5
1
m
370
340
310
280
250
220
190
160
%/PIN
2
2
2
2
2
2
2
2
UNIVERSAL INPUT (85-265 VAC)
Table 2. Typical Power Supply Component Parameters for a TOPSwitch-GX Flyback Power Supply with a Universal Input (5 V output).
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