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TDA7253L

3

HEAT SINK DIMENSIONING:

The parameters that influence the dimensioning are:

3.1 Example:

(Heat Sinker)

In figure 8 is shown the Power derating curve for the device.

Figure 11. Power Derating Curve

2V

cc

2

Π

2

R

lo ad

⋅

--------------------------

I

q

V

cc

⋅

+

R

Th c-a

150

T

am b max

–

P

d max

-----------------------------------------

R

Th j-c

–

150

50

–

6

----------------------

9

–

24.3

°C/W

==

=

a)

Infinite Heatsink

b)

10 °C/ W

c)

15 °C/ W

d)

20 °C/ W

(d)

(a)

(b)

(c)

0

2

4

6

8

10

040

80

120

160

Tamb (°C)

a)

Infinite Heatsink

b)

10 °C/ W

c)

15 °C/ W

d)

20 °C/ W

(d)

(a)

(b)

(c)

0

2

4

6

8

10

040

80

120

160

Tamb (°C)