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Philips Semiconductors
2 x 6 W hi-fi audio power amplifier
THERMAL RESISTANCE
From junction to case
HEATSINK DESIGN EXAMPLE
With derating of 6 K/W, the value of heatsink thermal resistance is calculated as follows:
given R
= 8
and V
= 12 V, the measured maximum dissipation is 7,8 W; then, for a maximum ambient temperature
L
P
of 60 C, the required thermal resistance of the heatsink is
150 60
–
R
--------------------- - 6
=
–
=
th h-a
7 8
Note: The metal tab (heatsink) has the same potential as pin 5 (
July 1994
Fig.2 Power derating curve.
5,5 K/W
R
= 6 K/W
th j-c
V
).
P
5
Product specification
TDA1521A
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