AN1703 - APPLICATION NOTE

4/22

allowable power dissipation turns out to be:

The next figure shows the maximum allowable power dissipation versus drain pad area for different

Figure 4: Maximum allowable power dissipation versus drain pad area

W

5

.

3

42

150

R

T

P

PCB

THj

D

=

=

∆

=

−

W

4

.

4

R

T

P

W

C

34

R

PCB

THJ

D

PCB

THJ

=

∆

=

⇒

°

=

−

−

0

1

2

3

4

5

0

200

400

600

800

1000

Tj-Ta=150°C

Tj-Ta=125°C

Tj-Ta=100°C

Tj-Ta=75°C

Tj-Ta=50°C

Area