ISL70419SEH Datasheet, PDF (18/22 Pages) Intersil Corporation – Spectral analysis equipment

ISL70419SEH
Power Dissipation
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:
T_JMAX = T_MAX + _JAxPD_MAXTOTAL
(EQ. 1)
where:
• P_DMAXTOTAL is the sum of the maximum power dissipation of
each amplifier in the package (PD_MAX)
• PD_MAX for each amplifier can be calculated using Equation 2:
PD_MAX = V_S  I_qMAX + V_S - V_OUTMAX   ^V-----^O----^U--_R--^T---_L-^M-----^A----^X--
(EQ. 2)
where:
• T_MAX = Maximum ambient temperature
• _JA = Thermal resistance of the package
• PD_MAX = Maximum power dissipation of 1 amplifier
• V_S = Total supply voltage
• I_qMAX = Maximum quiescent supply current of 1 amplifier
• V_OUTMAX = Maximum output voltage swing of the application
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July 11, 2014
FN8653.0