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TDA7263L データシート(PDF) 7 Page - Texas Instruments

部品番号 TDA7263L
部品情報  6 6W STEREO AMPLIFIER WITH MUTING
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
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TDA7263L データシート(HTML) 7 Page - Texas Instruments

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TDA7263L
6
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)
6.1 Example:
VCC = 20V, Rload = 8ohm, RTh j-c = 9 °C/W , Tamb max = 50°C
Pdmax = (N° channels) ·
Pdmax = 2 · ( 2.5 ) + 0.5 = 5.5W
(Heat Sinker)
In figure 11 is shown the Power derating curve for the device.
Figure 15. Power Derating Curve
2V
cc
2
Π
2
R
lo ad
--------------------------
I
q
V
cc
+
R
Th c-a
150
T
am b max
P
d max
-----------------------------------------
R
Th j-c
150
50
5.5
----------------------
9
9.0
°C/W
==
=
a)
Infinite Heatsink
b)
5.0 °C/ W
c)
7.0 °C/ W
(c)
(a)
(b)
0
2
4
6
8
10
0
40
80
120
160
Tamb (°C)
a)
Infinite Heatsink
b)
5.0 °C/ W
c)
7.0 °C/ W
(c)
(a)
(b)
0
2
4
6
8
10
0
40
80
120
160
Tamb (°C)


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