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March 1994 4
Philips Semiconductors Preliminary specification
Triple video output amplifier TDA6103Q
THERMAL RESISTANCE
Note
1. An external heatsink is necessary.
SYMBOL PARAMETER THERMAL RESISTANCE
R
th j-fin
from junction to fin; note 1 11 K/W
R
th h-a
from heatsink to ambient 18 K/W
Fig.3 Power derating curves.
(1) Infinite heatsink.
(2) No heatsink.
0 50 100–50
2
0
MGA972
150
P
tot
(W)
4
6
T ( C)
o
amb
(1)
(2)
1
3
5
Thermal protection
The internal thermal protection circuit gives a decrease of
the slew rate at high temperatures: 10% decrease at
130 °C and 30% decrease at 145 °C (typical values on the
spot of the thermal protection circuit).
Fig.4 Equivalent thermal resistance network.
Thermal protection circuit
5 K/W
6 K/W
OUTPUTS
FIN
MGA970