TDA7265SA Datasheet, PDF (9/12 Pages) STMicroelectronics – 18W+18W STEREO AMPLIFIER WITH MUTE & ST-BY

TDA7265SA
P_dmax = 2 · ( 7.7 ) + 1.0 = 16 W
(Heat Sinker)
R_{Th c-a}
=
1_----5_---0_{-----–----}T_{----a---m-----b----m----a---x-}
P_{d max}
–
R_Th
j-c
=
1_----5_---0_{-----–-----}5_---0_{-- – 3}
16
=
3.25 ° C /W
In figure 20 is shown the Power derating curve for the device.
Figure 20. Power derating curve
35
30
25
20
15
10
5
0
0
(b)
(a)
(c)
a) Infinite Heatsink
b) 1.5 °C/ W
c) 3.0 °C/ W
40
80
120
160
Tamb (°C)
7 CLIPWATT ASSEMBLING SUGGESTIONS
The suggested mounting method of Clipwatt on external heat sink, requires the use of a clip placed as much as
possible in the plastic body center, as indicated in the example of figure 21.
A thermal grease can be used in order to reduce the additional thermal resistance of the contact between pack-
age and heatsink.
A pressing force of 7 - 10 Kg gives a good contact and the clip must be designed in order to avoid a maximum
contact pressure of 15 Kg/mm² between it and the plastic body case.
As example, if a 15Kg force is applied by the clip on the package, the clip must have a contact area of 1mm²
at least.
Figure 21. Example of right placement of the clip
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