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)： 4/12頁
文件大?。?/td> 91K
代理商： AN-29
AN-29
4
D
2/03
50
°
C with an estimated temperature rise of 20
°
C inside the
plastic box, giving an internal ambient (T
A_INT
) of 70
°
C.
As a
TOPSwitch-GX
in a P-package is desired, from the
datasheet we obtain the thermal impedance from junction-to-
ambient (
θ
) of 60
°
C/W (645 mm
2
/ 1.0 sq. inch of 2 oz. copper
clad for heatsinking).
We first perform the following calculation for the most cost-
effective device. If found unsuitable, we must repeat the
calculation for the more expensive device.
T
T
P
J
A INT
JA
D
=
+
×
(
)
θ
For the TOP243P,
We see that thermally the TOP243P design is not acceptable.
Recalculating using the TOP244P.
With a smaller dissipation the TOP244P is just acceptable. A
junction temperature of 100
°
C provides sufficient margin for
device-to-device R
DS(ON)
variation.
Example 3: 70 W Universal Application
Consider a 70 W, 12 V power supply with Universal input
range. From the curves in Figure 2 we see that there are four
possible device choices:
a) TOP246Y: The projected efficiency is 73.8% and the
device dissipation is 8 W.
b) TOP247Y: The projected efficiency is 77% and the
device dissipation is 5.5 W.
c) TOP248Y. The projected efficiency is 78.5% and the
device dissipation is 4.5 W.
d) TOP249Y: This is the least cost effective device but has
the highest projected efficiency of 79.5% and the lowest
device dissipation of 3.9 W.
The thermal environment and the available heatsinking must
now be evaluated to confirm the final choice of device in this
application from the short list above. Again increasing the
output voltage would increase the efficiency and decrease
dissipation (e.g. 70 W, 19 V, 85-265 VAC gives 85% efficiency).
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
3190
243Y
1593
244Y
1062
245Y
797
246Y
531
247Y
398
248Y
319
249Y
265
%/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
5600
2800
1840
1200
1000
800
600
400
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
SINGLE VOLTAGE INPUT (230 VAC
±
15%)
Table 3. Typical Power Supply Component Parameters for a TOPSwitch-GX Flyback Power.
T
C
J
=
+
×
=
°
70
60
0. )
100
(
T
C
J
=
+
×
=
°
70
60
0. )
112
(
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