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TDA7266M データシート(PDF) 8 Page - STMicroelectronics

部品番号 TDA7266M
部品情報  7W7W DUAL BRIDGE AMPLIFIER
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
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TDA7266M データシート(HTML) 8 Page - STMicroelectronics

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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)
Example:
VCC = 11V, Rload = 8ohm, RTh j-c = 2.5 °C/W , Tamb max = 50°C
Pdmax = (N° channels) ·
Pdmax = 2 · ( 3.0 ) + 0.5 = 6.5 W
(Heat Sinker)
In figure 12 is shown the Power derating curve for the device.
Figure 12. Power derating curve
V
cc
2
Π
2
R
loa d
2
--------------
---------------------------
I
q
V
cc
+
R
Th c-a
150
T
am b max
P
d max
-----------------------------------------
R
Th j-c
150
50
6.5
----------------------
2.5
12.8
°C/W
==
=
a)
Infinite Heatsink
b)
7 °C/ W
c)
10 °C/ W
(c)
(a)
(b)
0
5
10
15
20
25
0
40
80
120
160
Tamb (°C)
a)
Infinite Heatsink
b)
7 °C/ W
c)
10 °C/ W
(c)
(a)
(b)
0
5
10
15
20
25
0
40
80
120
160
Tamb (°C)


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