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TDA7497SA Scheda tecnica(PDF) 6 Page - STMicroelectronics

Il numero della parte TDA7497SA
Spiegazioni elettronici  8W8W15W TRIPLE AMPLIFIER
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TDA7497SA Scheda tecnica(HTML) 6 Page - STMicroelectronics

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3
HEAT SINK DIMENSIONING:
In order to avoid the thermal protection intervention, that is placed approximatively at Tj = 150°C, it is important
the dimensioning of the Heat Sinker RTh (°C/W).
The parameters that influence the dimensioning are:
– Maximum dissipated power for the device (Pdmax)
– Max thermal resistance Junction to case (RTh j-c)
– Max. ambient temperature Tamb max
– Quiescent current Iq (mA)
3.1 Example:
VCC = 28V, Rload = 8ohm (left/right), Rload = 4ohm (centre), RTh j-c = 2.5°C/W , Tamb max = 50°C
Pdmax = (N° channels) ·
Pdmax = 2 · ( 3.95 ) + 1 · ( 7.9 ) + 1.2 = 17W
(Heat Sinker)
In figure 6 is shown the Power derating curve for the device.
Figure 11. Power Derating Curve
V
cc
2
2
Π
2
R
load
------------------------------ I
q
V
cc
+
R
Th c-a
150
T
amb max
P
d max
----------------------------------------- R
Th j-c
150
50
17
---------------------- 2.5
3.3
°C/W
==
=
a)
Infinite Heatsink
b)
1.5 °C/ W
c)
3.0 °C/ W
d)
5.0 °C/ W
(c)
(a)
(b)
(d)
0
5
10
15
20
25
30
35
040
80
120
160
Tamb (°C)
a)
Infinite Heatsink
b)
1.5 °C/ W
c)
3.0 °C/ W
d)
5.0 °C/ W
(c)
(a)
(b)
(d)
0
5
10
15
20
25
30
35
040
80
120
160
Tamb (°C)


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