NCV4290 Просмотр технического описания (PDF) - ON Semiconductor

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производитель

NCV4290

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

ON Semiconductor 

NCV4290

Thermal Model

A discussion of thermal modeling is in the ON Semiconductor web site: http://www.onsemi.com/pub/collateral/BR1487−D.PDF.

Table 1. DPAK 5−Lead Thermal RC Network Models

Drain Copper Area (1 oz thick)

168 mm2

736 mm2

(SPICE Deck Format)

Cauer Network

168 mm2

736 mm2

C_C1 Junction Gnd

9.5059E−06

9.5059E−06

C_C2 node1

Gnd

3.7125E−05

3.7125E−05

C_C3 node2

Gnd

1.1233E−05

1.1233E−05

C_C4 node3

Gnd

6.5344E−04

6.5339E−04

C_C5 node4

Gnd

2.1647E−02

2.1606E−02

C_C6 node5

Gnd

2.1471E−02

2.1361E−02

C_C7 node6

Gnd

7.9135E−02

7.8444E−02

C_C8 node7

Gnd

2.8534E−01

3.1338E−01

C_C9 node8

Gnd

6.6085E−01

1.5496

C_C10 node9

Gnd

8.7266E−01

168 mm2

24.4877

736 mm2

R_R1 Junction node1

1.3480E−01

1.3480E−01

R_R2 node1 node2

3.0852E−01

3.0853E−01

R_R3 node2 node3

8.0674E−01

8.0676E−01

R_R4 node3 node4

5.8520E−01

5.8528E−01

R_R5 node4 node5

4.7850E−01

4.8022E−01

R_R6 node5 node6

1.3832

1.3916

R_R7 node6 node7

4.8520

4.8196

R_R8 node7 node8

18.0698

10.0128

R_R9 node8 node9

15.7788

31.8880

R_R10 node9

Gnd

33.5404

2.7829

Units

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

C/W

C/W

C/W

C/W

C/W

C/W

C/W

C/W

C/W

C/W

168 mm2

736 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

4.770E−03

4.770E−03

4.129E−02

4.129E−02

4.237E−01

4.237E−01

3.499

3.499

8.532

49.601

77.552

88.429

R’s

R’s

0.0803

0.0803

0.1736

0.1736

0.5491

0.5491

0.9733

0.9733

0.1096

0.1096

0.7361

0.7361

2.8713

2.8713

3.0988

8.1070

10.1005

14.0987

57.2455

25.5115

Units

sec

sec

sec

sec

sec

sec

sec

sec

sec

sec

C/W

C/W

C/W

C/W

C/W

C/W

C/W

C/W

C/W

C/W

NOTE: Bold face items represent the package without the external thermal system.

Junction R1

R2

R3

Rn

C1

C2

C3

Cn

Time constants are not simple RC products. Amplitudes

of mathematical solution are not the resistance values.

Ambient

(thermal ground)

Figure 16. Grounded Capacitor Thermal Network (“Cauer” Ladder)

Junction R1

R2

R3

Rn

C1

C2

C3

Cn

Each rung is exactly characterized by its RC−product

time constant; amplitudes are the resistances.

Ambient

(thermal ground)

Figure 17. Non−Grounded Capacitor Thermal Ladder (“Foster” Ladder)

http://onsemi.com

10

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