FDS8978 Dual N-Channel PowerTrench
®
MOSFET
SPICE Thermal Model
REV February 2005
template FDS8878 n2,n1,n3
Copper Area =1.0 in
2
CTHERM1 TH 8 2.0e-3
CTHERM2 8 7 5.0e-3
CTHERM3 7 6 1.0e-2
CTHERM4 6 5 4.0e-2
CTHERM5 5 4 9.0e-2
CTHERM6 4 3 2e-1
CTHERM7 3 2 1
CTHERM8 2 TL 3
RTHERM1 TH 8 1e-1
RTHERM2 8 7 5e-1
RTHERM3 7 6 1
RTHERM4 6 5 5
RTHERM5 5 4 8
RTHERM6 4 3 12
RTHERM7 3 2 18
RTHERM8 2 TL 25
th
JUNCTION
RTHERM1
CTHERM1
8
RTHERM2
CTHERM2
7
RTHERM3
CTHERM3
SABER Thermal Model
Copper Area = 1.0 in
2
template thermal_model th tl
thermal_c th, tl
{
ctherm.ctherm1 th 8 =2.0e-3
ctherm.ctherm2 8 7 =5.0e-3
ctherm.ctherm3 7 6 =1.0e-2
ctherm.ctherm4 6 5 =4.0e-2
ctherm.ctherm5 5 4 =9.0e-2
ctherm.ctherm6 4 3 =2e-1
ctherm.ctherm7 3 2 1
ctherm.ctherm8 2 tl 3
rtherm.rtherm1 th 8 =1e-1
rtherm.rtherm2 8 7 =5e-1
rtherm.rtherm3 7 6 =1
rtherm.rtherm4 6 5 =5
rtherm.rtherm5 5 4 =8
rtherm.rtherm6 4 3 =12
rtherm.rtherm7 3 2 =18
rtherm.rtherm8 2 tl =25
}
RTHERM4
6
CTHERM4
5
RTHERM5
CTHERM5
4
RTHERM6
CTHERM6
3
RTHERM7
CTHERM7
2
RTHERM8
CTHERM8
tl
CASE
TABLE 1. THERMAL MODELS
COMPONANT
CTHERM6
CTHERM7
CTHERM8
RTHERM6
RTHERM7
RTHERM8
0.04 in
2
1.2e-1
0.5
1.3
26
39
55
0.28 in
2
1.5e-1
1.0
2.8
20
24
38.7
0.52 in
2
2.0e-1
1.0
3.0
15
21
31.3
0.76 in
2
2.0e-1
1.0
3.0
13
19
29.7
1.0 in
2
2.0e-1
1.0
3.0
12
18
25
©2011 Fairchild Semiconductor Corporation
FDS8978 Rev. B1
10
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