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ISL70218SRH
Power Dissipation
PD MAX for each amplifier can be calculated using Equation 2:
PD MAX = V S × I qMAX + ( V S - V OUTMAX ) × ------------------------
R
It is possible to exceed the +150°C maximum junction
temperatures under certain load and power supply conditions. It
is therefore important to calculate the maximum junction
temperature (T JMAX ) for all applications to determine if power
supply voltages, load conditions, or package type need to be
modified to remain in the safe operating area. These parameters
are related using Equation 1:
V OUTMAX
L
where
? PD MAX = Maximum power dissipation of one amplifier
? V S = Total supply voltage
(EQ. 2)
T JMAX = T MAX + θ JA xPD MAXTOTAL
(EQ. 1)
? I qMAX = Maximum quiescent supply current of one amplifier
where
? PD MAXTOTAL is the sum of the maximum power dissipation of
each amplifier in the package (PD MAX )
? T MAX = Maximum ambient temperature
? Θ JA = Thermal resistance of the package
15
? V OUTMAX = Maximum output voltage swing of the application
? R L = Load resistance
FN7871.1
August 17, 2011
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