ncv4275a ON Semiconductor, ncv4275a Datasheet - Page 13

• Manufacturer Part Number: ncv4275a
• Description: 5.0 V, 3.3 V 450 Ma Low-dropout Voltage Regulator With Reset
• Manufacturer: ON Semiconductor

NOTE:
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:
Table 2. D
Drain Copper Area (1 oz thick)
C_C10
R_R10
C_C1
C_C2
C_C3
C_C4
C_C5
C_C6
C_C7
C_C8
C_C9
R_R1
R_R2
R_R3
R_R4
R_R5
R_R6
R_R7
R_R8
R_R9
The Cauer networks generally have physical significance and may be divided between nodes to separate thermal behavior
(SPICE Deck Format)
Bold face items represent the package without the external thermal system.
Junction
Junction
2
node1
node2
node3
node4
node1
node2
node3
node4
node5
node6
node7
node8
node9
node5
node6
node7
node8
node9
PAK 5−Lead Thermal RC Network Models
node1
node2
node3
node4
node5
node6
node7
node8
node9
Gnd
Gnd
Gnd
Gnd
Gnd
Gnd
Gnd
Gnd
Gnd
Gnd
gnd
241 mm
1.00E−06
1.00E−05
6.00E−05
1.00E−04
2.82E−04
5.58E−03
4.25E−01
9.22E−01
241 mm
241 mm
1.85638
1.23672
9.81541
33.1868
27.0263
1.13944
0.015
1.73
7.12
0.08
0.4
0.2
Cauer Network
2
2
2
R(t) +
http://onsemi.com
1.00E−06
1.00E−05
6.00E−05
1.00E−04
2.87E−04
5.95E−03
4.61E−01
788 mm
653 mm
653 mm
18.9591
13.3369
0.0150
0.0800
0.4000
0.2000
1.8839
1.2272
5.3383
0.1191
i + 1
2.05
4.88
1.31
S
n
R i 1−e −t tau i
2
2
13
2
W−s/C
W−s/C
W−s/C
W−s/C
W−s/C
W−s/C
W−s/C
W−s/C
W−s/C
W−s/C
Units
C/W
C/W
C/W
C/W
C/W
C/W
C/W
C/W
C/W
C/W
1.361E−08
7.411E−07
1.005E−05
3.460E−05
7.868E−04
7.431E−03
2.786E+00
2.014E+01
1.134E+02
241 mm
0.0123
0.0585
0.0257
0.3413
60.80
1.77
1.54
4.13
6.27
Tau
R’s
Foster Network
2
1.361E−08
7.411E−07
1.007E−05
3.480E−05
8.107E−04
7.830E−03
2.012E+00
2.601E+01
1.218E+02
788 mm
0.0123
0.0585
0.0260
0.3438
29.30
1.81
1.52
3.46
5.03
Tau
R’s
2
Units
C/W
C/W
C/W
C/W
C/W
C/W
C/W
C/W
C/W
C/W
sec
sec
sec
sec
sec
sec
sec
sec
sec
sec