參數(shù)資料
型號: NCV4275
廠商: ON SEMICONDUCTOR
元件分類: 基準電壓源/電流源
英文描述: 5.0V, 450mA Low Drop Voltage Regulator(5.0V, 450mA低壓差穩(wěn)壓器)
中文描述: 5.0V,四百五十○毫安低壓差穩(wěn)壓器(5.0V,四百五十○毫安低壓差穩(wěn)壓器)
文件頁數(shù): 9/16頁
文件大小: 117K
代理商: NCV4275
NCV4275
http://onsemi.com
9
Thermal Model
A discussion of thermal modeling is in the ON Semiconductor web site: http://www.onsemi.com/pub/collateral/BR1487D.PDF.
Table 1. DPAK 5Lead Thermal RC Network Models
Drain Copper Area (1 oz thick)
168 mm
2
736 mm
2
168 mm
2
736 mm
2
(SPICE Deck Format)
Cauer Network
168 mm
2
Foster Network
736 mm
2
Units
Tau
Tau
Units
C_C1
Junction
Gnd
1.00E06
1.00E06
Ws/C
1.36E08
1.361E08
sec
C_C2
node1
Gnd
1.00E05
1.00E05
Ws/C
7.41E07
7.411E07
sec
C_C3
node2
Gnd
6.00E05
6.00E05
Ws/C
1.04E05
1.029E05
sec
C_C4
node3
Gnd
1.00E04
1.00E04
Ws/C
3.91E05
3.737E05
sec
C_C5
node4
Gnd
4.36E04
3.64E04
Ws/C
1.80E03
1.376E03
sec
C_C6
node5
Gnd
6.77E02
1.92E02
Ws/C
3.77E01
2.851E02
sec
C_C7
node6
Gnd
1.51E01
1.27E01
Ws/C
3.79E+00
9.475E01
sec
C_C8
node7
Gnd
4.80E01
1.018
Ws/C
2.65E+01
1.173E+01
sec
C_C9
node8
Gnd
3.740
2.955
Ws/C
8.71E+01
8.59E+01
sec
C_C10
node9
Gnd
10.322
0.438
Ws/C
sec
168 mm
2
736 mm
2
R’s
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
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 15. 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 RCproduct
time constant; amplitudes are the resistances.
Ambient
(thermal ground)
Figure 16. NonGrounded Capacitor Thermal Ladder (“Foster” Ladder)
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