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NCV8508D2T50G

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26
NCV8508
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16
qJA vs Copper Spreader Area
0
20
40
60
80
100
120
0 100 200 300 400 500 600 700 800
qJA (°C/W)
COPPER AREA (mm
2
)
Figure 29. D
2
PAK 7−lead qJA as a Function of the
Pad Copper Area Including Traces, Board Material
1 oz
2 oz
0.01
0.1
1
10
100
0.000001 0.00001 0.0001 0.001
0.01
0.1
1 10 100 1000
Time (sec)
Cu Area 118 mm
2
Cu Area 626 mm
2
R(t) (°C/W)
Figure 30. D
2
PAK 7−Lead Single Pulse Heating Curve
0.01
0.1
10
100
0.000001 0.00001 0.0001 0.001 0.01
0.1
1 10 100 1000
Pulse Duration (sec)
1
R(t) (°C/W)
Single
50% Duty Cycle
20%
10%
5%
1%
Cu Area 626 mm
2
, 1 oz Cu
Figure 31. D
2
PAK 7−Lead Thermal Duty Cycle Curves on 1” Spreader Test Board
NCV8508
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17
Junction
R
1
C
1
C
2
R
2
C
3
R
3
C
n
R
n
Time constants are not simple RC products. Amplitudes
of mathematical solution are not the resistance values.
Ambient
(thermal ground)
Figure 32. Grounded Capacitor Thermal Network (“Cauer” Ladder)
Junction
R
1
C
1
C
2
R
2
C
3
R
3
C
n
R
n
Each rung is exactly characterized by its RC−product
time constant; amplitudes are the resistances.
Ambient
(thermal ground)
Figure 33. Non−Grounded Capacitor Thermal Ladder (“Foster” Ladder)
NCV8508
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18
Recommend Thermal Data for SOIC−8 EP Package
Parameter Test Conditions Typical Value Units
Pad is soldered to PCB copper min−pad board (Note 10) 1”−pad board (Note 11)
Junction−to−Lead (psi−JL, Y
JL
)
64 54 °C/W
Junction−to−Lead (psi−JPad, Y
Jp
)
14 11 °C/W
Junction−to−Ambient (R
q
JA
, q
JA
)
122 84 °C/W
10.1 oz. copper, 54 mm
2
copper area, 0.062” thick FR4.
11. 1 oz. copper, 717 mm
2
copper area, 0.062” thick FR4.
8−SOIC EP Half Symmetry
Copper Pad Layout
25 x 25mm
Bottom view
With mold compound
Top view
Without and without mold compound
Figure 34. Internal Construction of the Package and PCB Layout for Multiple Pad Area
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26

NCV8508D2T50G

Mfr. #:
Buy NCV8508D2T50G
Manufacturer:
ON Semiconductor
Description:
IC REG LINEAR 5V 250MA D2PAK-7
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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