TDA7297SA

8/11

HEAT SINK DIMENSIONING:

The parameters that influence the dimensioning are:

Example:

(Heat Sinker)

In figure 15 is shown the Power derating curve for the device.

Figure 15. Power derating curve

V

cc

2

Π

2

R

loa d

2

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

⋅

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

I

q

V

cc

⋅

+

R

Th c-a

150

T

am b max

–

P

d max

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

R

Th j-c

–

150

50

–

9

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

2.5

–

8.6

°C/W

==

=

a)

Infinite Heatsink

b)

3.5 °C/ W

c)

5.0 °C/ W

d)

7.0 °C/ W

(c)

(a)

(b)

(d)

0

5

10

15

20

25

30

35

0

40

80

120

160

Tamb (°C)

a)

Infinite Heatsink

b)

3.5 °C/ W

c)

5.0 °C/ W

d)

7.0 °C/ W

(c)

(a)

(b)

(d)

0

5

10

15

20

25

30

35

0

40

80

120

160

Tamb (°C)