TDA8512 Philips Semiconductors, TDA8512 Datasheet - Page 8

• Manufacturer Part Number: TDA8512
• Description: 26 W BTL and 2 x 13 W SE or 4 x 13 W SE power amplifier
• Manufacturer: Philips Semiconductors

Philips Semiconductors
11 THERMAL CHARACTERISTICS
In accordance with IEC 60747-1.
The measured thermal resistance of the IC-package (R
maximum ambient temperature of 60 C and V
For the application two SE outputs with 2
For the application BTL output with 4
At T
The above calculation is for application at worst-case (stereo) sine-wave output signals. In practice, music signals will be
applied. In that case the maximum power dissipation will be about the half the sine-wave power dissipation, which allows
the use of a smaller heatsink.
2001 Nov 16
R
R
SYMBOL
So the total power dissipation is P
So P
R
So P
R
th(j-a)
th(j-c)
26 W BTL and 2
4
th(hs)
th(hs)
j(max)
d(tot)
d(tot)
13 W SE power amplifier
= R
= R
= 150 C the temperature increase, caused by the power dissipation, is: T = 150 C
th(tot)
th(tot)
thermal resistance from junction to ambient
thermal resistance from junction to case
R
R
th(tot)
th(tot)
R
R
= T = 90 K. As a result:
= T = 90 K. As a result:
th(j-c)
th(j-c)
= 3.4
= 6.8
PARAMETER
13 W SE or
handbook, halfpage
1.3 = 2.1 K/W.
1.3 = 5.5 K/W.
3.0 K/W
d(tot)
Fig.5 Equivalent thermal resistance network.
load, the worst-case sine-wave dissipation is 12.5 W.
0.7 K/W
output 1
= 2
load, the measured worst-case sine-wave dissipation is 2
R
R
7 + 12.5 W = 26.5 W.
P
th tot
th tot
= 15 V, the following calculation for the heatsink can be made:
output 2
0.2 K/W
3.0 K/W
=
=
virtual junction
th(j-c)
---------- -
26.5
-------------- -
13.25
90
90
case
8
) is maximum 1.3 K/W if all four channels are driven. For a
3.0 K/W
=
in free air
see Fig.5
=
3.4 K/W
0.7 K/W
output 3
6.8 K/W
CONDITIONS
MEA860 - 2
which means:
output 4
which means:
3.0 K/W
Preliminary specification
60 C = 90 C.
VALUE
40.0
1.3
TDA8512J
7 W
UNIT
K/W
K/W