TDA7495SA Просмотр технического описания (PDF) - STMicroelectronics

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TDA7495SA

11 W + 11 W amplifier with DC volume control

STMicroelectronics 

TDA7495SA

4

Thermal considerations

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:

" maximum dissipated power for the device (Pdmax)

" maximum thermal resistance junction to case (RTh j-c)

" maximum ambient temperature Tamb_max

Example:

For VCC = 20 V, RL = 8 Ω, RTh j-c = 5° C/W, Tamb_max = 50° C

Pdmax = Number_of_channels *

-----V-----c---c---2-------

2Π2 ⋅ RL

=5W

For the heatsink,

RTh j-c

=

1----5---0-----–-----T---a---m----b---_---m---a---x-

Pd max

–

RTh

j-c

=

1----0---0-- – 5

5

=

15°C/W

Figure 25 shows the power derating curve for the device.

Figure 25. Power derating curve

20

15

(d)

(a)

10

(b)

5

(c)

a) Infinite Heatsink

b) 7 °C/ W

c) 10 °C/ W

d) 3.3 °C/ W

0

0

40

80

120

160

Tamb (°C)

11/15

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