NCV4276B(2010) Просмотр технического описания (PDF) - ON Semiconductor
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NCV4276B Datasheet PDF : 12 Pages
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NCV4276B
Thermal Model
A discussion of thermal modeling is in the ON Semiconductor web site: http://www.onsemi.com/pub/collateral/BR1487−D.PDF.
Table 1. DPAK 5−Lead Thermal RC Network Models
Drain Copper Area (1 oz thick)
168 mm2
736 mm2
(SPICE Deck Format)
Cauer Network
168 mm2
736 mm2
Units
168 mm2
736 mm2
Foster Network
Tau
Tau
Units
C_C1 Junction GND
1.00E−06
1.00E−06
W−s/C
1.36E−08
1.361E−08
sec
C_C2 node1
GND
1.00E−05
1.00E−05
W−s/C
7.41E−07
7.411E−07
sec
C_C3 node2
GND
6.00E−05
6.00E−05
W−s/C
1.04E−05
1.029E−05
sec
C_C4 node3
GND
1.00E−04
1.00E−04
W−s/C
3.91E−05
3.737E−05
sec
C_C5 node4
GND
4.36E−04
3.64E−04
W−s/C
1.80E−03
1.376E−03
sec
C_C6 node5
GND
6.77E−02
1.92E−02
W−s/C
3.77E−01
2.851E−02
sec
C_C7 node6
GND
1.51E−01
1.27E−01
W−s/C
3.79E+00
9.475E−01
sec
C_C8 node7
GND
4.80E−01
1.018
W−s/C
2.65E+01
1.173E+01
sec
C_C9 node8
GND
3.740
2.955
W−s/C
8.71E+01
8.59E+01
sec
C_C10 node9
GND
10.322
0.438
W−s/C
168 mm2
736 mm2
R’s
sec
R’s
R_R1 Junction node1
0.015
0.015
C/W
0.0123
0.0123
C/W
R_R2 node1 node2
0.08
0.08
C/W
0.0585
0.0585
C/W
R_R3 node2 node3
0.4
0.4
C/W
0.0304
0.0287
C/W
R_R4 node3 node4
0.2
0.2
C/W
0.3997
0.3772
C/W
R_R5 node4 node5
2.97519
2.6171
C/W
3.115
2.68
C/W
R_R6 node5 node6
8.2971
1.6778
C/W
3.571
1.38
C/W
R_R7 node6 node7
25.9805
7.4246
C/W
12.851
5.92
C/W
R_R8 node7 node8
46.5192
14.9320
C/W
35.471
7.39
C/W
R_R9 node8 node9
17.7808
19.2560
C/W
46.741
28.94
C/W
R_R10 node9
GND
0.1
0.1758
C/W
C/W
NOTE: Bold face items represent the package without the external thermal system.
Junction R1
R2
R3
Rn
C1
C2
C3
Cn
Time constants are not simple RC products. Amplitudes
of mathematical solution are not the resistance values.
Ambient
(thermal ground)
Figure 13. Grounded Capacitor Thermal Network (“Cauer” Ladder)
Junction R1
R2
R3
Rn
C1
C2
C3
Cn
Each rung is exactly characterized by its RC−product
time constant; amplitudes are the resistances.
Ambient
(thermal ground)
Figure 14. Non−Grounded Capacitor Thermal Ladder (“Foster” Ladder)
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