NCV4290(2012) Просмотр технического описания (PDF) - ON Semiconductor

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Компоненты Описание

производитель

NCV4290
(Rev.:2012)

5.0 V, 450 mA Low-Dropout Voltage Regulator with Power Good

ON Semiconductor 

NCV4290

Table 2. D2PAK 5−Lead Thermal RC Network Models

Drain Copper Area (1 oz thick)

241 mm2

788 mm2

(SPICE Deck Format)

Cauer Network

241 mm2

788 mm2

C_C1 Junction Gnd

9.5070E−06

9.5071E−06

C_C2 node1

Gnd

3.7150E−05

3.7151E−05

C_C3 node2

Gnd

1.1261E−04

1.1262E−04

C_C4 node3

Gnd

6.6126E−04

6.6143E−04

Units

W−s/C

W−s/C

W−s/C

W−s/C

241 mm2

788 mm2

Foster Network

Tau

Tau

1.000E−06

1.000E−06

1.000E−05

1.000E−05

1.000E−04

1.000E−04

4.893E−04

4.893E−04

Units

sec

sec

sec

sec

C_C5

C_C6

C_C7

C_C8

C_C9

C_C10

node4

node5

node6

node7

node8

node9

Gnd

Gnd

Gnd

Gnd

Gnd

Gnd

R_R1

R_R2

R_R3

R_R4

R_R5

R_R6

R_R7

R_R8

R_R9

R_R10

Junction

node1

node2

node3

node4

node5

node6

node7

node8

node9

node1

node2

node3

node4

node5

node6

node7

node8

node9

gnd

2.9986E−02

5.2806E−02

3.9578E−01

9.6950E−01

2.26

231.58

241 mm2

1.3476E−01

3.0817E−01

8.0361E−01

5.7370E−01

2.6250E−01

5.6022E−01

4.0655

38.4592

14.9707

2.5618E−01

3.0234E−02

5.4409E−02

4.6168E−01

1.66

37.44

4089.09

788 mm2

1.3476E−01

3.0817E−01

8.0355E−01

5.7346E−01

2.5833E−01

5.3623E−01

3.1454

42.3515

1.9244

1.6530E−02

W−s/C

W−s/C

W−s/C

W−s/C

W−s/C

W−s/C

C/W

C/W

C/W

C/W

C/W

C/W

C/W

C/W

C/W

C/W

4.770E−03

4.129E−02

1.294E+00

2.089E+01

5.824E+01

R’s

0.0803

0.1736

0.5491

0.9733

0.1096

0.5367

1.8971

2.9679

1.9498

4.770E−03

sec

4.129E−02

sec

1.294E+00

sec

6.008E+01

sec

7.069E+01

sec

sec

R’s

0.0803

C/W

0.1736

C/W

0.5491

C/W

0.9733

C/W

0.1096

C/W

0.5367

C/W

1.8971

C/W

2.9679

C/W

4.0572

C/W

C/W

NOTE: Bold face items 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:

n

S R(t) + i + 1 Ri ǒ1−e−tńtaui Ǔ

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