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NCV7361A Datasheet(PDF) 20 Page - ON Semiconductor

Part No. NCV7361A
Description  Voltage Regulator with Integrated LIN Transceiver
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCV7361A Datasheet(HTML) 20 Page - ON Semiconductor

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NCV7361A
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Table 1. SO−8 Thermal RC Network Models*
Copper Area (1 oz thick)
54 mm2
714 mm2
54 mm2
714 mm2
(SPICE Deck Format)
Cauer Network
Foster Network
54 mm2
714 mm2
Units
Tau
Tau
Units
C_C1
Junction
GND
1.08E−05
1.08E−05
W−s/C
1.00E−06
1.00E−06
sec
C_C2
node1
GND
4.10E−05
4.10E−05
W−s/C
1.00E−05
1.00E−05
sec
C_C3
node2
GND
1.13E−04
1.13E−04
W−s/C
1.00E−04
1.00E−04
sec
C_C4
node3
GND
4.42E−04
4.40E−04
W−s/C
5.00E−04
5.00E−04
sec
C_C5
node4
GND
1.74E−03
1.71E−03
W−s/C
1.00E−03
1.00E−03
sec
C_C6
node5
GND
1.39E−03
1.34E−03
W−s/C
1.00E−02
1.00E−02
sec
C_C7
node6
GND
2.08E−02
1.78E−02
W−s/C
1.00E−01
1.00E−01
sec
C_C8
node7
GND
1.08E−02
9.75E−03
W−s/C
1.00E+00
1.00E+00
sec
C_C9
node8
GND
1.14E−01
1.84E−01
W−s/C
1.00E+01
1.00E+01
sec
C_C10
node9
GND
8.11E−01
3.00E+00
W−s/C
5.00E+01
5.00E+01
sec
R’s
R’s
R_R1
Junction
node1
0.119
0.119
C/W
0.070
0.070
C/W
R_R2
node1
node2
0.286
0.286
C/W
0.152
0.152
C/W
R_R3
node2
node3
0.857
0.859
C/W
0.481
0.481
C/W
R_R4
node3
node4
1.181
1.189
C/W
0.690
0.690
C/W
R_R5
node4
node5
1.241
1.276
C/W
0.584
0.584
C/W
R_R6
node5
node6
2.574
2.690
C/W
3.223
3.223
C/W
R_R7
node6
node7
18.065
21.708
C/W
0.823
0.823
C/W
R_R8
node7
node8
27.965
26.035
C/W
26.801
35.166
C/W
R_R9
node8
node9
80.896
49.821
C/W
63.710
52.538
C/W
R_R10
node9
GND
49.468
15.252
C/W
86.119
25.510
C/W
*Bold face items in the tables above represent the package without the external thermal system.
The
Cauer
networks
generally
have
physical
significance and may be divided between nodes to separate
thermal behavior due to one portion of the network from
another. The Foster networks, though when sorted by time
constant (as above) bear a rough correlation with the Cauer
networks, are really only convenient mathematical models.
Cauer networks can be easily implemented using circuit
simulating tools, whereas Foster networks may be more
easily implemented using mathematical tools (for instance,
in a spreadsheet program), according to the following
formula:
R(t)
+
n
S
i
+ 1
Ri 1−e
−t taui
Junction
Ambient
(thermal ground)
R1
R2
C1
C2
C3
Cn
Rn
R3
Time constants are
not simple RC products.
Amplitudes of mathematical solution are
not the resistance values.
Figure 29. Grounded Capacitor Thermal Network (“Cauer” Ladder)
Figure 30. Non−Grounded Capacitor Thermal Ladder (“Foster” Ladder)
Junction
Ambient
(thermal ground)
R1
R2
C1
C2
C3
Cn
Rn
R3
Each rung is exactly characterized by its RC−product time constant; Am-
plitudes are the resistances


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