TDA7495SA

Thermal considerations

11/15

4

Thermal considerations

In order to avoid the intervention of the thermal protection, it is important to choose an

adequate heatsink.

The parameters that influence the heatsink size are:

"

"

"

Example:

= 5 W

For the heatsink,

Figure 25 shows the power derating curve for the device.

Figure 25.

Power derating curve

V

cc

2

2

Π

2

R

L

⋅

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

R

Th j-c

150

T

amb_max

–

P

d max

---------------------------------------- R

Th j-c

–

100

5

---------- 5

–

15

°C/W

==

=

a)

Infinite Heatsink

b)

7 °C/ W

c)

10 °C/ W

(c)

(a)

(d)

0

5

10

15

20

040

80

120

160

Tamb (°C)

a)

Infinite Heatsink

b)

7 °C/ W

c)

10 °C/ W

(c)

(a)

(b)

0

5

10

15

20

040

80

120

160

Tamb (°C)

d)

3.3 °C/ W