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Safe operating area TS617
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3 Safe operating area
Figure 24. Equivalent schematic
Vout(rms) is the rms output voltage value. Iout(rms) is the rms output current value through
the output load R-load. When supplied by +/-Vcc, the power which must be dissipated by
one operator is p=Iout(rms)x(+Vcc-Vout(rms)). Since the TS617 is used in a differential
configuration using both operators, it must dissipate 2 x p. The power dissipated by the
TS617 is derived from:
(eq1),
P = 2 x [ Iout(rms) x (+Vcc-Vout(rms)) ].
In the following formula:
(eq2),
T
j
is the junction temperature, T
amb
is the ambient temperature and Rthja is the junction-to-
ambient thermal resistance of the package (SO-14: Rthja = 103° C/watt).
Assuming that T
j
must be lower than 150° C to avoid any damage to the dice, it is derived
from (eq2):
(eq3),
From (eq1) and (eq3) we can easily extract the maximum value of V
out
(rms) that the TS617
can drive without any damage (according to T
amb
and R-load).
6OUTRMS
2 LOAD
)OUTRMS
6CC
6CC
6CC 6OUTRMS
43
!-
P
Tj Tamb–()
Rthja
--------------------------------=
Pmax
150 Tamb–
103
--------------------------------
inWatt(),=
