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AN1703 Datasheet(PDF) 7 Page - STMicroelectronics

Part # AN1703
Description  GUIDELINES FOR USING ST?셎 MOSFET SMD PACKAGES
PDF  22 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN1703 Datasheet(HTML) 7 Page - STMicroelectronics

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AN1703 - APPLICATION NOTE
7/22
Figure 8: SOT-223 and its recommended footprint (all dimensions are in mm)
Figure 9 shows the measured values of RTHJ-PCB versus drain pad area from minimum recommended
footprint to 10cm2, for
t
≤ 10s as power pulse:
Figure 9: RTHJ-PCB versus drain pad area for SOT-223
Measurements performed for minimum recommended footprint (15mm2) and
t
≤ 10s give R
THJ-PCB =
56.6°C/W and the maximum allowable power dissipation results:
30
40
50
60
0
200
400
600
800
1000
Rthj-PCB [°C/W]
Minimum recommended footprint
Area
mm2
FR-4, 2 oz copper board
W
R
T
P
PCB
THj
D
2
.
2
6
.
56
125 =
=
∆
=
−
(T
JMAX = 150°C, TC = 25°C)
W
R
T
P
PCB
THj
D
2
.
2
6
.
56
125 =
=
∆
=
−
(T
JMAX = 150°C, TC = 25°C)



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